title: Spectral results for the dominating induced matching problem

abstract:
  A matching M is a dominating induced matching of a graph, if every edge of
the graph is either in $M$ or has a common end-vertex with exactly one edge in
$M$. The concept of complete dominating induced matching is introduced as
graphs where the vertex set can be partitioned into two subsets, one of them
inducing an $1$-regular graph and the other defining an independent set and
such that all the remaining edges connect each vertex of one set to each vertex
of the other. The principal eigenvectors of the adjacency, Laplacian and
signless Laplacian matrices of graphs with complete dominating induced
matchings are characterized and, therefore, the polynomial time recognition of
graphs with complete dominating induced matchings is stated. The adjacency,
Laplacian and signless Laplacian spectrum of graphs with complete dominating
induced matchings are characterized. Finally, several upper and lower bounds on
the cardinality of a dominating induced matching obtained from the eigenvalues
of the adjacency, Laplacian and signless Laplacian matrices are deduced and
examples for which some of these bounds are tight are presented.


title: Large Independent Sets in Triangle-Free Planar Graphs

abstract:
  Every triangle-free planar graph on n vertices has an independent set of size
at least (n+1)/3, and this lower bound is tight. We give an algorithm that,
given a triangle-free planar graph G on n vertices and an integer k>=0, decides
whether G has an independent set of size at least (n+k)/3, in time
2^{O(sqrt{k})}n. Thus, the problem is fixed-parameter tractable when
parameterized by k. Furthermore, as a corollary of the result used to prove the
correctness of the algorithm, we show that there exists epsilon>0 such that
every planar graph of girth at least five on n vertices has an independent set
of size at least n/(3-epsilon).


title: Unusual angular dependence of tunneling magneto-Seebeck effect

abstract:
  We find an unusual angular dependence of the tunneling magneto-Seebeck effect
(TMS). The conductance shows normally a cosine-dependence with the angle
between the magnetizations of the two ferromagnetic leads. In contrast, the
angular dependence of the TMS depends strongly on the tunneling magneto
resistance (TMR) ratio. For small TMR ratios we obtain also a cosine-dependence
whereas for very large TMR ratios the angular dependence approaches a step-like
function.


title: L-infinity Algebras From Multicontact Geometry

abstract:
  I define higher codimensional versions of contact structures on manifolds as
maximally non-integrable distributions. I call them multicontact structures.
Cartan distributions on jet spaces provide canonical examples. More generally,
I define higher codimensional versions of pre-contact structures as
distributions on manifolds whose characteristic symmetries span a constant
dimensional distribution. I call them pre-multicontact structures. Every
distribution is almost everywhere, locally, a pre-multicontact structure. After
showing that the standard symplectization of contact manifolds generalizes
naturally to a (pre-)multisymplectization of (pre-)multicontact manifolds, I
make use of results by C. Rogers and M. Zambon to associate a canonical
$L_{\infty}$-algebra to any (pre-)multicontact structure. Such
$L_{\infty}$-algebra is a multicontact version of the Jacobi bracket on a
contact manifold. However, unlike the multisymplectic $L_\infty$-algebra of
Rogers and Zambon, the multicontact $L_\infty$-algebra is always a homological
resolution of a Lie algebra. Finally, I describe in local coordinates the
$L_{\infty}$-algebra associated to the Cartan distribution on jet spaces.


title:
Nanoscale Structure and Energy Dissipation Behaviour of Tungsten
  Disulphide and Gold Nanoparticles and Nanoclusters Investigated by Advanced
  Microscopy Techniques

abstract:
  In this study nanoscale structure and associated energy dissipation behavior
of nanoparticulates of tungsten disulphide (WS2) and nanoparticles of gold (Au)
were investigated by advanced scanning probe and electron microscopy
techniques. WS2 nanoparticulates were deposited on silicon substrate by van der
Waals adhesion transfer-deposition mechanisms. The templates of three size
variants of Au nanoparticles, close packed (4-6nm), well dispersed (120-150nm)
and clusters of (120-150 nm) nanoparticles were prepared on silicon substrates.
Nano-microstructure, morphology, topography and phase shift of both WS2 and Au
nanoparticles and nanoparticulates were characterized by Atomic Force
Microscopy (AFM), Scanning Electron Microscopy (SEM) and Transmission Electron
Microscopy (TEM). SEM and TEM observations showed that the nanoparticulates of
WS2 are atomically oriented lamellar-hexagonal structure or inorganic graphite
like structure. In the tapping mode AFM imaging, repeated scanning of
nanoparticulates of WS2 resulted in inter layer movement of nanolayers. It was
observed that cluster of Au nanoparticles caused more phase shift and high
energy dissipation compared to that of well dispersed Au nanoparticles, however
close packed Au nanoparticles caused lowest phase shift and energy dissipation.
Nano-microstructure, morphology, topography and phase shift were analyzed by
SXM software. The nanoscale studies showed that the phase shift and the energy
dissipation were influenced by the geometrical and mechanical gradient of the
samples.


title:
The infrared K-band identification of the DSO/G2 source from VLT and
  Keck data

abstract:
  A fast moving infrared excess source (G2) which is widely interpreted as a
core-less gas and dust cloud approaches Sagittarius A* (SgrA*) on a presumably
elliptical orbit. VLT K_s-band and Keck K'-band data result in clear continuum
identifications and proper motions of this about 19m Dusty S-cluster Object
(DSO). In 2002-2007 it is confused with the star S63, but free of confusion
again since 2007. Its near-infrared (NIR) colors and a comparison to other
sources in the field speak in favor of the DSO being an IR excess star with
photospheric continuum emission at 2 microns than a core-less gas and dust
cloud. We also find very compact L'-band emission ($<$0.1'') contrasted by the
reported extended (0.03'' up to about 0.2'' for the tail) Brgamma emission. The
presence of a star will change the expected accretion phenomena, since a
stellar Roche lobe may retain a fraction of the material during and after the
peri-bothron passage.


title:
Escaping from controversies in $CP$ violation measurements in charm
  decays

abstract:
  The breaking of the $CP$ symmetry in $D^0$ meson decays has been awaited for
a long time. After a set of measurements provided by the LHCb, CDF, and Belle
Collaborations leading in march 2012 to combined results that were consistent
with no $CP$ violation at a CL of $0.006\%$ suggesting $CP$ violation at
$\sim1\%$ level. Such a potentially large value of $CP$ violation in charm
decays has triggered widespread interest from the whole particle physics
community to evaluate the implications of such an interesting unexpected
results. However, a more recent combination of more up-to-date results in March
2013, has slightly changed the situation, showing that data are consistent with
the $CP$ conserving hypothesis at $2.1\%$ CL. I briefly review the method used
by the various Collaborations when extracting the quantity $\Delta A_{CP}$ and
the relative results. Finally I discuss the need for additional measurements,
and present the potential of a time-dependent analysis when looking for $CP$
violation in $D^0$ decays and how this can be used to largely improve the
current sensitivity on the mixing phase $\phi_{MIX}$.


title: A Non-Iterative Transformation Method for Newton's Free Boundary Problem

abstract:
  In book II of Newton's "Principia Mathematica" of 1687 several applicative
problems are introduced and solved. There, we can find the formulation of the
first calculus of variations problem that leads to the first free boundary
problem of history. The general calculus of variations problem is concerned
with the optimal shape design for the motion of projectiles subject to air
resistance. Here, for Newton's optimal nose cone free boundary problem, we
define a non-iterative initial value method which is referred in literature as
transformation method. To define this method we apply invariance properties of
Newton's free boundary problem under a scaling group of point transformations.
Finally, we compare our non-iterative numerical results with those available in
literature and obtained via an iterative shooting method. We emphasize that our
non-iterative method is faster than shooting or collocation methods and does
not need any preliminary computation to test the target function as the
iterative method or even provide any initial iterate. Moreover, applying
Buckingham Pi-Theorem we get the functional relation between the unknown free
boundary and the nose cone radius and height.


title: Zeros of QCD partition function from finite density lattices

abstract:
  Partition function zeros steer the critical behavior of a system. Studying
four-flavor lattice QCD at finite temperature and density with the
Wilson-clover fermion action and the Iwasaki gauge action using a
phase-quenched fermion determinant, we combine statistics from multiple
chemical potentials to improve sampling of the configuration space, and aim at
unraveling the movement of zeros in finite systems. Preparing for further
investigations, we discuss methods and criteria used to sieve through complex
parameter space spanned by $(\text{Re}\mu, \text{Im}\mu)$ and $(\text{Re}\mu,
\text{Im}\beta)$, and present statistically robust zeros of the partition
function.


title: Progenetix: 12 years of oncogenomic data curation

abstract:
  DNA copy number aberrations (CNAs) can be found in the majority of cancer
genomes, and are crucial for understanding the potential mechanisms underlying
tumor initiation and progression. Since the first release in 2001, the
Progenetix project (http://www.progenetix.org) has provided a reference
resource dedicated to provide the most comprehensive collection of genome-wide
CNA profiles. Reflecting the application of comparative genomic hybridization
(CGH) techniques to tens of thousands of cancer genomes, over the past 12 years
our data curation efforts have resulted in a more than 60-fold increase in the
number of cancer samples presented through Progenetix. In addition, new data
exploration tools and visualization options have been added. In particular, the
gene specific CNA frequency analysis should facilitate the assignment of cancer
genes to related cancer types. Additionally, the new user file processing
interface allows users to take advantage of the online tools, including various
data representation options for proprietary data pre-publication. In this
update article, we report recent improvements of the database in terms of
content, user interface and online tools.


title:
Introduction to Teichm\"uller theory and its applications to dynamics of
  interval exchange transformations, flows on surfaces and billiards

abstract:
  This text is an expanded version of the lecture notes of a minicourse (with
the same title of this text) delivered by the authors in the Bedlewo school
"Modern Dynamics and its Interaction with Analysis, Geometry and Number Theory"
(from 4 to 16 July, 2011).
  In the first part of this text, i.e., from Sections 1 to 5, we discuss the
Teichm\"uller and moduli space of translation surfaces, the Teichm\"uller flow
and the SL(2,R)-action on these moduli spaces and the Kontsevich-Zorich cocycle
over the Teichm\"uller geodesic flow. We sketch two applications of the ergodic
properties of the Teichm\"uller flow and Kontsevich-Zorich cocycle, with
respect to Masur-Veech measures, to the unique ergodicity, deviation of ergodic
averages and weak mixing properties of typical interval exchange
transformations and translation flows. These applications are based on the
fundamental fact that the Teichm\"uller flow and the Kontsevich-Zorich cocycle
work as \emph{renormalization dynamics} for interval exchange transformations
and translation flows.
  In the second part, i.e., from Sections 6 to 9, we start by pointing out that
it is interesting to study the ergodic properties of the Kontsevich-Zorich
cocycle with respect to invariant measures other than the Masur-Veech ones, in
view of potential applications to the investigation of billiards in rational
polygons (for instance). We then study some examples of measures for which the
ergodic properties of the Kontsevich-Zorich cocycle are very different from the
case of Masur-Veech measures. Finally, we end these notes by constructing some
examples of closed SL(2,R)-orbits such that the restriction of the
Teichm\"uller flow to them has arbitrary small rate of exponential mixing, or,
equivalently, the naturally associated unitary SL(2,R)-representations have
arbitrarily small spectral gap (and in particular it has complementary series).


title: Ultraviolet variability of quasars: dependence on the accretion rate

abstract:
  We compiled a catalogue of about 4000 SDSS quasars including individual
estimators V for the variability strength, virial black hole masses M, and mass
accretion rates dM/dt from the Davis-Laor scaling relation. We confirm
significant anti-correlations between V and dM/dt, the Eddington ratio, and the
bolometric luminosity L, respectively. A weak, statistically not significant
positive trend is indicated for the dependence of V on M. As a side product, we
find a strong correlation of the radiative efficiency with M and show that this
trend is most likely produced by selection effects in combination with the mass
errors and the use of the scaling relation for dM/dt. The anti-correlations
found for V cannot be explained in such a way. The strongest anti-correlation
is found with dM/dt. However, it is difficult to decide which of the quantities
(L, Eddington ratio, dM/dt) is intrinsically correlated with V and which of the
observed correlations are produced by the relations between these quantities. A
V-dM/dt anti-correlation is qualitatively expected for the strongly
inhomogeneous accretion disks. We argue that several observed variability
properties are not adequately explained by the simple multi-temperature
black-body model of a standard disk and suggest to check whether the strongly
inhomogeneous disk model is capable of reproducing these observations better.


title: Single site model of large N gauge theories coupled to adjoint fermions

abstract:
  We consider a single site large N gauge theory coupled to adjoint fermions at
weak coupling. We study the distribution of the eigenvalues of the link
variables using a four-dimensional density function. We show that it is
possible to recover the infinite-volume continuum limit for a certain range of
fermion flavors if we use fermions with a bare mass of zero.


title:
Systematic investigation of the effects of disorder at the lowest order
  throughout the BCS-BEC crossover

abstract:
  A systematic investigation of the effects of disorder on the BCS-BEC
crossover at the lowest order in the impurity potential is presented for the
normal phase above the critical temperature Tc. Starting with the t-matrix
approach for the clean system, by which pairing correlations between
opposite-spin fermions evolve from the weak-coupling (BCS) to the
strong-coupling (BEC) limits by increasing the strength of the attractive
inter-particle interaction, all possible diagrammatic processes are considered
where the effects of a disordered potential are retained in the self-energy at
the lowest order. An accurate numerical investigation is carried out for all
these diagrammatic terms, to determine which of them are mostly important
throughout the BCS-BEC crossover. Explicit calculations for the values of Tc,
the chemical potential, and the Tan's contact are carried out. In addition, the
effect of disorder on the single-particle spectral function is analyzed, and a
correlation is found between an increase of Tc and a widening of the pseudo-gap
energy at Tc on the BCS side of unitarity in the presence of disorder, while on
the BEC side of unitarity the presence of disorder favors the collapse of the
underlying Fermi surface. The present investigation is meant to orient future
studies when the effects of disorder will be considered at higher orders, with
the purpose of limiting the proliferation of diagrammatic terms in which
interaction and disorder are considered simultaneously.


title: Escape dynamics of Bose-Hubbard dimer out of a trap

abstract:
  We consider a potential scattering of Bose-Hubbard dimer in 1D optical
lattice. A numerical approach based on effective non-Hermitian Hamiltonian has
been developed for solving the scattering problem. It allows to compute the
tunneling and dissociation probabilities for arbitrary shape of the potential
barrier and arbitrary kinetic energy of the dimer. The developed approach has
been used to address the problem of two-particle decay out of a trap. In
particular, it is shown that the presence of dissociation channels
significantly decreases non-escape probability due to single-particle escape to
those channels.


title: Einstein's conversion from his static to an expanding universe

abstract:
  In 1917 Einstein initiated modern cosmology by postulating, based on general
relativity, a homogeneous, static, spatially curved universe. To counteract
gravitational contraction he introduced the cosmological constant. In 1922
Alexander Friedman showed that Einstein's fundamental equation also allowed
dynamical worlds, and in 1927 Geroges Lemaitre, backed by observational
evidence, concluded that our universe was expanding. Einstein impetuously
rejected Friedman's as well as Lemaitre's findings. However, in 1931 he
retracted his former static model in favour of a dynamic solution. This
investigation follows Einstein on his hesitating path from a static to the
expanding universe. Contrary to an often repeated belief the primary motive for
his switch was not observational evidence, but the realisation that his static
model was unstable.


title: Inverse design of cooperative electromagnetic interactions

abstract:
  The cooperative electromagnetic interactions between discrete resonators have
been widely used to modify the optical properties of metamaterials. Here we
propose a general evolutionary approach for engineering these interactions in
arbitrary networks of resonators. To illustrate the performances of this
approach, we designed by genetic algorithm, an almost perfect broadband
absorber in the visible range made with a simple binary array of metallic
nanoparticles.


title:
Teleportation-induced entanglement of two nanomechanical oscillators
  coupled to a topological superconductor

abstract:
  A one-dimensional topological superconductor features a single fermionic zero
mode that is delocalized over two Majorana bound states located at the ends of
the system. We study a pair of spatially separated nanomechanical oscillators
tunnel-coupled to these Majorana modes. Most interestingly, we demonstrate that
the combination of electron-phonon coupling and a finite charging energy on the
mesoscopic topological superconductor can lead to an effective superexchange
between the oscillators via the non-local fermionic zero mode. We further show
that this teleportation mechanism leads to entanglement of the two oscillators
over distances that can significantly exceed the coherence length of the
superconductor.


title:
Time-domain analysis of a dynamically tuned signal recycled
  interferometer for the detection of chirp gravitational waves from coalescing
  compact binaries

abstract:
  In this article we study a particular method of detection of chirp signals
from coalescing compact binary stars -- the so-called dynamical tuning, i.e.
amplification of the signal via tracking of its instantaneous frequency by the
tuning of the signal-recycled detector. A time-domain consideration developed
for signal-recycled interferometers, in particular GEO 600, describes the
signal and noise evolution in the non-stationary detector. Its non-stationarity
is caused by motion of the signal recycling mirror, whose position defines the
tuning of the detector. We prove that the shot noise from the dark port and
optical losses remains white. The analysis of the transient effects shows that
during the perfect tracking of the chirp frequency only transients from
amplitude changes arise. The signal-to-noise-ratio gain, calculated in this
paper, is ~ 16 for a shot-noise limited detector and ~ 4 for a detector with
thermal noise.


title: Superconductivity and unusual magnetic behavior in amorphous carbon

abstract:
  Traces of superconductivity (SC) at elevated temperatures (up to 65 K) were
observed by magnetic measurements in three different inhomogeneous sulfur doped
amorphous carbon (a-C) systems: (a) in commercial and (b) synthesized powders
and (c) in a-C thin films. (a) Studies performed on commercial (a-C) powder
which contains 0.21% of sulfur, revealed traces of non-percolated
superconducting phases below Tc = 65 K. The SC volume fraction is enhanced by
the sulfur doping. (b) a-C powder obtained by pyrolytic decomposition of
sucrose did not show any sign for SC above 5 K. This powder was mixed with
sulfur and synthesized at 400 C (a-CS). The inhomogeneous products obtained,
show traces of SC phases at TC= 17 and 42 K. (c) Non-superconducting composite
a-C-W thin films were grown by electron-beam induced deposition. SC emerged at
Tc = 34.4 K only after heat treatment with sulfur. Other parts of the pyrolytic
a-CS powder, show unusual magnetic features. (i) Pronounced irreversible peaks
around 55-75 K appear in the first zero-field-cooled (ZFC) sweep only. Their
origin is not known. (ii) Unexpectedly these peaks are totally suppressed in
the second ZFC runs measured a few minutes later. (iii) Around the peak
position the field-cooled (FC) curves cross the ZFC plots (ZFC>FC). These
peculiar magnetic observations also ascribed to a-CS powder prepared from the
commercial a-C powder and are connected to each other. All SC and magnetic
phenomena observed are intrinsic properties of the sulfur doped a-C materials.
It is proposed that the a-CS systems behave similarly to well known high TC
curates and/or pnictides in which SC emerges from magnetic states.


title:
Dirac-Fermion-Induced Parity Mixing in Superconducting Topological
  Insulators

abstract:
  We self-consistently study surface states of superconducting topological
insulators. We clarify that, if a topologically trivial bulk s-wave pairing
symmetry is realized, parity mixing of pair potential near the surface is
anomalously enhanced by surface Dirac fermions, opening an additional surface
gap larger than the bulk one. In contrast to classical s-wave superconductors,
the resulting surface density of state hosts an extra coherent peak at the
induced gap besides a conventional peak at the bulk gap. We also find that no
such extra peak appears for odd-parity superconductors with a cylindrical Fermi
surface. Our calculation suggests that the simple U-shaped scanning tunneling
microscope spectrum in Cu$_x$Bi$_2$Se$_3$ does not originate from s-wave
superconductivity, but can be explained by odd-parity superconductivity with a
cylindrical Fermi surface.


title:
GPU Enhancement of the Trigger to Extend Physics Reach at the Large
  Hadron Collider

abstract:
  At the Large Hadron Collider (LHC), the trigger systems for the detectors
must be able to process a very large amount of data in a very limited amount of
time, so that the nominal collision rate of 40 MHz can be reduced to a data
rate that can be stored and processed in a reasonable amount of time. This need
for high performance places very stringent requirements on the complexity of
the algorithms that can be used for identifying events of interest in the
trigger system, which potentially limits the ability to trigger on signatures
of various new physics models. In this paper, we present an alternative
tracking algorithm, based on the Hough transform, which avoids many of the
problems associated with the standard combinatorial track finding currently
used. The Hough transform is also well-adapted for Graphics Processing Unit
(GPU)-based computing, and such GPU-based systems could be easily integrated
into the existing High-Level Trigger (HLT). This algorithm offers the ability
to trigger on topological signatures of new physics currently not practical to
reconstruct, such as events with jets or black holes significantly displaced
from the primary vertex. This paper presents, for the first time, an
implementation and preliminary performance results using NVIDIA Tesla C2075 and
K20c GPUs.


title:
Influence of an electron-beam exposure on the surface plasmon resonance
  of gold nanoparticles

abstract:
  Electron beam imaging is a common technique used for characterizing the
morphology of plasmonic nanostructures. During the imaging process, the
electron beam interacts with traces of organic material in the chamber and
produces a well-know layer of amorphous carbon over the specimen under
investigation. In this paper, we investigate the effect of this carbon
adsorbate on the spectral position of the surface plasmon in individual gold
nanoparticles as a function of electron exposure dose. We find an optimum dose
for which the plasmonic response of the nanoparticle is not affected by the
imaging process. The final publication is available at link.springer.com


title: The first analysis of extragalactic binary-orbit precession

abstract:
  The main aim of the present paper is the very first analysis of the
binary-orbit precession out of our Galaxy. The light curves of an eclipsing
binary MACHO 82.8043.171 in the Large Magellanic cloud (LMC) were studied in
order to analyse the long-term evolution of its orbit. It is a detached system
that is undergoing rapid orbit precession. The inclination of the orbit towards
the observer has been changing, which has caused the eclipse depth to become
lower over the past decade, and this is ongoing. The period of this effect was
derived as only about 77 years, so it is the second fastest nodal motion known
amongst such systems nowadays. This is the first analysis of an extragalactic
binary with nodal precession. This effect is probably caused by a distant third
body orbiting the pair, which could potentially be detected via spectroscopy.
Some preliminary estimates of this body are presented. However, even such a
result can tell us something about the multiplicity fraction in other galaxies.


title:
Group representation approach to 1 - N universal quantum cloning
  machines

abstract:
  In this work, we revisit the problem of finding an admissible region of
fidelities obtained after an application of an arbitrary $1 \rightarrow N$
universal quantum cloner which has been recently solved in [A. Kay et al.,
Quant. Inf. Comput 13, 880 (2013)] from the side of cloning machines. Using
group-theory formalism, we show that the allowed region for fidelities can be
alternatively expressed in terms of overlaps of pure states with recently found
irreducible representations of the commutant $U \otimes U \otimes \ldots
\otimes U \otimes U^*$, which gives the characterization of the allowed region
where states being cloned are figure of merit. Additionally, it is sufficient
to take pure states with real coefficients only, which makes calculations
simpler. To obtain the allowed region, we make a convex hull of possible ranges
of fidelities related to a given irrep. Subsequently, two cases: $1 \rightarrow
2$ and $1 \rightarrow 3$ cloners, are studied for different dimensions of
states as illustrative examples.


title:
Mutually unbiased measurements for high-dimensional time-bin based
  photonic states

abstract:
  The task of measuring in two mutually unbiased bases is central to many
quantum information protocols, as well as being of fundamental interest.
Increasingly, there is an experimental focus on generating and controlling
high-dimensional photonic states. One approach is to use the arrival time of a
photon, which can be split into discrete time bins. An important problem
associated with such states is the difficulty in experimentally realizing a
measurement that is mutually unbiased with respect to the time-of-arrival. We
propose a simple and compact scheme to measure in both the time of arrival
basis and a basis that is approximately mutually unbiased with respect to the
arrival time.


title: An alternative to Witt vectors

abstract:
  The ring of Witt vectors associated to a ring R is a classical tool in
algebra. We introduce a ring C(R) which is more easily constructed and which is
isomorphic to the ring of Witt vectors W(R) for a perfect F_p-algebra R. It is
obtained as the completion of the monoid ring ZR, for the multiplicative monoid
R, with respect to the powers of the kernel of the natural map from ZR to R.


title:
Magnetic Coupling and Single-Ion Anisotropy in Surface-Supported
  Mn-based Metal-Organic Networks

abstract:
  The electronic and magnetic properties of Mn coordinated to
1,2,4,5-tetracyanobenzene (TCNB) in the Mn-TCNB 2D metal-ligand networks have
been investigated by combining scanning tunneling microscopy and X-ray magnetic
circular dichroism (XMCD) performed at low temperature (3 K). When formed on
Au(111) and Ag(111) substrates the Mn-TCNB networks display similar geometric
structures. Magnetization curves reveal ferromagnetic (FM) coupling of the Mn
sites with similar single-ion anisotropy energies, but different coupling
constants. Low-temperature XMCD spectra show that the local environment of the
Mn centers differs appreciably for the two substrates. Multiplet structure
calculations were used to derive the corresponding ligand field parameters
confirming an in-plane uniaxial anisotropy. The observed interatomic coupling
is discussed in terms of superexchange as well as substrate-mediated magnetic
interactions.


title:
On the Convergence Properties of Non-Euclidean Extragradient Methods for
  Variational Inequalities with Generalized Monotone Operators

abstract:
  In this paper, we study a class of generalized monotone variational
inequality (GMVI) problems whose operators are not necessarily monotone (e.g.,
pseudo-monotone). We present non-Euclidean extragradient (N-EG) methods for
computing approximate strong solutions of these problems, and demonstrate how
their iteration complexities depend on the global Lipschitz or H\"{o}lder
continuity properties for their operators and the smoothness properties for the
distance generating function used in the N-EG algorithms. We also introduce a
variant of this algorithm by incorporating a simple line-search procedure to
deal with problems with more general continuous operators. Numerical studies
are conducted to illustrate the significant advantages of the developed
algorithms over the existing ones for solving large-scale GMVI problems.


title: Sensitivity of the DANSS detector to short range neutrino oscillations

abstract:
  DANSS is a highly segmented 1m^3 plastic scintillator detector. It's 2500
scintillator strips have a Gd loaded reflective cover. Light is collected with
3 wave length shifting fibers per strip and read out with 50 PMTs and 2500
SiPMs. The DANSS will be installed under the industrial 3 GW reactor of the
Kalinin Nuclear Power Plant at distances varying from 9.7m to 12.2m from the
reactor core. Tests of the detector prototype DANSSino demonstrated that in
spite of a small size (20x20x100 cm^3) it is quite sensitive to reactor
antineutrinos, detecting about 70 Inverse Beta Decay events per day with the
signal-to-background ratio of about unity. The prototype tests have
demonstrated feasibility to reach the design performance of the DANSS detector.
The DANSS experiment will detect about 10 thousand antineutrino events per day
with a background below ~1%. Detector will be calibrated every day and its
position will be changed frequently to reduce systematic errors. These features
will provide a high sensitivity to reactor antineutrino oscillations to sterile
neutrinos, suggested recently to explain a so-called "reactor anomaly". Data
taking will start already next year.


title: Stationary entanglement of photons and atoms in a high-finesse resonator

abstract:
  We predict that the collective excitations of an atomic array become
entangled with the light of a high-finesse cavity mode when they are suitably
coupled. This entanglement is of Einstein-Podolsky-Rosen type, it is robust
against cavity losses and is a stationary property of the coupled system. It is
generated when the atomic array is aligned along the cavity axis and driven
transversally by a laser, when coherent scattering of photons into the cavity
mode is suppressed because of phase-mismatching. We identify the parameter
regimes under which entanglement is found and show that these are compatible
with existing experimental setups.


title: Realizing Chemical Codoping in Oxide Semiconductors

abstract:
  We demonstrate experimentally a chemical codoping approach that would
simultaneously narrow the band gap and control the band edge positions of oxide
semiconductors. Using TiO2 as an example, we show that a sequential doping
scheme with nitrogen (N) leading the way, followed by phosphorous (P), is
crucial for the incorporation of both N and P into the anion sites. Various
characterization techniques confirm the formation of the N-P bonds, and as a
consequence of the chemical codoping, the band gap of the TiO2 is reduced from
3.0 eV to 1.8 eV. The realization of chemical codoping could be an important
step forward in improving the general performance of electronic and
optoelectronic materials and devices.


title:
A priori estimation of a time step for numerically solving parabolic
  problems

abstract:
  This work deals with the problem of choosing a time step for the numerical
solution of boundary value problems for parabolic equations. The problem
solution is derived using the fully implicit scheme, whereas a time step is
selected via explicit calculations. The selection strategy consists of the
following steps. First, using the explicit scheme, we calculate the solution at
a new time level. Next, we employ this solution in order to obtain the solution
at the previous time level (the implicit scheme, explicit calculations). This
solution should be close to the solution of our problem at this time level with
a prescribed accuracy. Such an algorithm leads to explicit formulas for the
calculation of the time step and takes into account both the dynamics of the
problem solution and changes in coefficients of the equation and in its
right-hand side. The same formulas for the evaluation of the time step we get
using a comparison of two approximate solutions, which are obtained using the
explicit scheme with the primary time step and the step that is reduced by
half. Numerical results are presented for a model parabolic boundary value
problem, which demonstrate the robustness of the developed algorithm for the
time step selection.


title:
A narrow structure in the excitation function of eta-photoproduction off
  the neutron

abstract:
  The photoproduction of $\eta$-mesons off nucleons bound in $^2$H and $^3$He
has been measured in coincidence with recoil protons and recoil neutrons for
incident photon energies from threshold up to 1.4 GeV. The experiments were
performed at the Mainz MAMI accelerator, using the Glasgow tagged photon
facility. Decay photons from the $\eta\rightarrow 2\gamma$ and $\eta\rightarrow
3\pi^0$ decays and the recoil nucleons were detected with an almost $4\pi$
electromagnetic calorimeter combining the Crystal Ball and TAPS detectors. The
data from both targets are of excellent statistical quality and show a narrow
structure in the excitation function of $\gamma n\rightarrow n\eta$. The
results from the two measurements are consistent taking into account the
expected effects from nuclear Fermi motion. The best estimates for position and
intrinsic width of the structure are $W$ = (1670$\pm$5) MeV and $\Gamma$
=(30$\pm$15) MeV. For the first time precise results for the angular dependence
of this structure have been extracted.


title:
Effective dynamics of twisted and curved scroll waves using virtual
  filaments

abstract:
  Scroll waves are three-dimensional excitation patterns that rotate around a
central filament curve; they occur in many physical, biological and chemical
systems. We explicitly derive the equations of motion for scroll wave filaments
in reaction-diffusion systems with isotropic diffusion up to third order in the
filament's twist and curvature. The net drift components define at every
instance of time a virtual filament which lies close to the instantaneous
filament. Importantly, virtual filaments obey simpler, time-independent laws of
motion which we analytically derive here and illustrate with numerical
examples. Stability analysis of scroll waves is performed using virtual
filaments, showing that filament curvature and twist add as quadratic terms to
the nominal filament tension. Applications to oscillating chemical reactions
and cardiac tissue are discussed.


title: Minors for alternating dimaps

abstract:
  We develop a theory of minors for alternating dimaps --- orientably embedded
digraphs where, at each vertex, the incident edges (taken in the order given by
the embedding) are directed alternately into, and out of, the vertex. We show
that they are related by the triality relation of Tutte. They do not commute in
general, though do in many circumstances, and we characterise the situations
where they do. The relationship with triality is reminiscent of similar
relationships for binary functions, due to the author, so we characterise those
alternating dimaps which correspond to binary functions. We give a
characterisation of alternating dimaps of at most a given genus, using a finite
set of excluded minors. We also use the minor operations to define simple Tutte
invariants for alternating dimaps and characterise them. We establish a
connection with the Tutte polynomial, and pose the problem of characterising
universal Tutte-like invariants for alternating dimaps based on these minor
operations.


title:
Thermodynamic Description of the LCST of Charged Thermoresponsive
  Copolymers

abstract:
  The dependence of the lower critical solution temperature (LCST) of charged,
thermosensitive copolymers on their charge fraction and the salt concentration
is investigated by employing systematic cloud-point experiments and analytical
theory. The latter is based on the concept of the Donnan equilibrium
incorporated into a thermodynamic expansion of a two-state free energy around a
charge-neutral reference homopolymer and should be applicable for weakly
charged (or highly salted) polymer systems. Very good agreement is found
between the theoretical description and the experiments for aqueous solutions
of the responsive copolymer poly(NIPAM-co-EVImBr) for a wide range of salt
concentrations and charge fractions up to 8%, using only two global, physical
fitting parameters.


title:
On the Buratti-Horak-Rosa Conjecture about Hamiltonian Paths in Complete
  Graphs

abstract:
  In this paper we investigate a problem proposed by Marco Buratti, Peter Horak
and Alex Rosa (denoted by BHR-problem) concerning Hamiltonian paths in the
complete graph with prescribed edge-lengths. In particular we solve
BHR({1^a,2^b,t^c}) for any even integer t>=4, provided that a+b>=t-1.
Furthermore, for t=4,6,8 we present a complete solution of BHR({1^a,2^b,t^c})
for any positive integer a,b,c.


title:
Exclusive radiative B-meson decays within minimal flavour violating
  2HDMs

abstract:
  In the "Higgs basis" for a generic 2HDM, only one doublet gets a nonzero
vacuum expectation value and, under the criterion of minimal flavour violation,
the other one is fixed to be either colour-singlet or colour-octet, referred
respectively as the type-III and the type-C model. Both of them can naturally
avoid large FCNC transitions and provide very interesting phenomena in some
low-energy processes. In this paper, we study their effects on exclusive
radiative B-meson decays due to the exchange of colourless or coloured charged
Higgs. It is found that, while constraints from the branching ratios are
slightly weaker than the ones from the inclusive $B\to X_{s} \gamma$ decay, the
isospin asymmetries in exclusive decays provide very complementary bounds on
the model parameters. As the two models predict similar corrections to the
dipole coefficient $C_7^{\rm eff}$ whereas similar magnitudes but with opposite
signs to $C_8^{\rm eff}$, the branching ratios cannot discriminate the two
models, and we have to resort to the direct CP and isospin asymmetries of $b\to
s$ processes, which are more sensitive to $C_8^{\rm eff}$. Due to the CKM
factors $|\lambda_u^{(d)}|\sim|\lambda_t^{(d)}|$, the terms proportional to
$\lambda_u^{(d)}$ make the observables of $b\to d$ processes exhibit a
different dependence on the possible new physics phase. In addition,
correlations between the various observables in the exclusive $B\to V\gamma$
and the inclusive $B\to X_{s,d}\gamma$ decays are investigated, which could
provide further insights into the models with more precise experimental
measurements and theoretical predictions for these decays.


title: The irreversible quantum

abstract:
  We elaborate on the existing notion that quantum mechanics is an emergent
phenomenon, by presenting a thermodynamical theory that is dual to quantum
mechanics. This dual theory is that of classical irreversible thermodynamics.
The linear regime of irreversibility considered here corresponds to the
semiclassical approximation in quantum mechanics. An important issue we address
is how the irreversibility of time evolution in thermodynamics is mapped onto
the quantum-mechanical side of the correspondence.


title:
Photometric evolution of Nova Del 2013 (V339 Del) during the optically
  thick phase

abstract:
  We present and discuss the BVRI photometric evolution of Nova Del 2013 from
the time of discovery, which occurred a few days before maximum brightness, to
day +77, when the optically thick phase was over.


title:
Structuring research methods and data with the Research Object model:
  genomics workflows as a case study

abstract:
  One of the main challenges for biomedical research lies in the
computer-assisted integrative study of large and increasingly complex
combinations of data in order to understand molecular mechanisms. The
preservation of the materials and methods of such computational experiments
with clear annotations is essential for understanding an experiment, and this
is increasingly recognized in the bioinformatics community. Our assumption is
that offering means of digital, structured aggregation and annotation of the
objects of an experiment will provide necessary meta-data for a scientist to
understand and recreate the results of an experiment. To support this we
explored a model for the semantic description of a workflow-centric Research
Object (RO), where an RO is defined as a resource that aggregates other
resources, e.g., datasets, software, spreadsheets, text, etc. We applied this
model to a case study where we analysed human metabolite variation by
workflows.


title:
Heavy particle radioactivity from superheavy nuclei leading to
  $^{298}$114 daughter nuclei

abstract:
  The feasibility for the alpha decay and the heavy particle decay from the
even-even superheavy (SH) nuclei with Z = 116-124 have been studied within the
Coulomb and proximity potential model (CPPM). The Universal formula for cluster
decay (UNIV) of Poenaru et al., the Universal Decay Law (UDL) and the Scaling
Law of Horoi et al., has also been used for the evaluation of the decay half
lives. A comparison of our predicted half lives with the values evaluated using
these empirical formulas are in agreement with each other and hence CPPM could
be considered as a unified model for alpha and cluster decay studies. The
spontaneous fission half lives of the corresponding parents have also been
evaluated using the semi-empirical formula of Santhosh et al. Within our
fission model, we have studied cluster formation probability for various
clusters and the maximum cluster formation probability for the decay
accompanying $^{298}$114 reveals its doubly magic behavior. In the plots for
log_10(T_1/2) against the neutron number of the daughter in the corresponding
decay, the half life is found to be the minimum for the decay leading to
$^{298}$114 (Z = 114, N = 184) and this also indicate its doubly magic
behavior. Most of the predicted half lives are well within the present upper
limit for measurements and the computed alpha half lives for $^{290,292}$116
agrees well with the experimental data. We have thus confidently indicate
towards a new island for the cluster radioactivity around the superheavy
isotope $^{298}$114 and its neighbors and we hope to receive experimental
information about the cluster decay half lives of these considered SHs, hoping
to confirm the present calculations.


title:
When Does More Regularization Imply Fewer Degrees of Freedom? Sufficient
  Conditions and Counter Examples from Lasso and Ridge Regression

abstract:
  Regularization aims to improve prediction performance of a given statistical
modeling approach by moving to a second approach which achieves worse training
error but is expected to have fewer degrees of freedom, i.e., better agreement
between training and prediction error. We show here, however, that this
expected behavior does not hold in general. In fact, counter examples are given
that show regularization can increase the degrees of freedom in simple
situations, including lasso and ridge regression, which are the most common
regularization approaches in use. In such situations, the regularization
increases both training error and degrees of freedom, and is thus inherently
without merit. On the other hand, two important regularization scenarios are
described where the expected reduction in degrees of freedom is indeed
guaranteed: (a) all symmetric linear smoothers, and (b) linear regression
versus convex constrained linear regression (as in the constrained variant of
ridge regression and lasso).


title: Damping filter method for obtaining spatially localized solutions

abstract:
  Spatially localized structures are key components of turbulence and other
spatio-temporally chaotic systems. From a dynamical systems viewpoint, it is
desirable to obtain corresponding exact solutions, though their existence is
not guaranteed. A damping filter method is introduced to obtain variously
localized solutions, and adopted into two typical cases. This method introduces
a spatially selective damping effect to make a good guess at the exact
solution, and we can obtain an exact solution through a continuation with the
damping amplitude. First target is a steady solution to Swift-Hohenberg
equation, which is a representative of bi-stable systems in which localized
solutions coexist, and a model for span-wisely localized cases. Not only
solutions belonging to the well-known snaking branches but also those belonging
to an isolated branch known as "isolas" are found with a continuation paths
between them in phase space extended with the damping amplitude. This indicates
that this spatially selective excitation mechanism has an advantage in
searching spatially localized solutions. Second target is a spatially localized
traveling-wave solution to Kuramoto-Sivashinsky equation, which is a model for
stream-wisely localized cases. Since the spatially selective damping effect
breaks Galilean and translational invariances, the propagation velocity cannot
be determined uniquely while the damping is active, and a singularity arises
when these invariances are recovered. We demonstrate that this singularity can
be avoided by imposing a simple condition, and a localized traveling-wave
solution is obtained with a specific propagation speed.


title:
A determination of the average up-down, strange and charm quark masses
  from $N_f=2+1+1$

abstract:
  We present a lattice QCD determination of the average up-down, strange and
charm quark masses based on simulations performed by the European Twisted Mass
Collaboration with $N_f = 2 + 1 + 1$ dynamical fermions. We simulated at three
different values of the lattice spacing, the smallest being approximately
$0.06fm$, and with pion masses as small as $210 \text{MeV}$. Our results are:
$m_{ud}(2\text{GeV})=3.70(17)\text{MeV}$,
$m_s(2\text{GeV})=99.2(3.9)\text{MeV}$, $m_c(m_c)=1.350(49)\text{GeV}$,
$m_s/m_{ud}=26.64(30)$ and $m_c/m_s=11.65(12)$.


title: Semistable modules over Lie algebroids in positive characteristic

abstract:
  We study Lie algebroids in positive characteristic and moduli spaces of their
modules. In particular, we show a Langton's type theorem for the corresponding
moduli spaces. We relate Langton's construction to Simpson's construction of
gr-semistable Griffiths transverse filtration. We use it to prove a recent
conjecture of Lan-Sheng-Zuo that semistable systems of Hodge sheaves on
liftable varieties in positive characteristic are strongly semistable.


title:
Complete solution of a constrained tropical optimization problem with
  application to location analysis

abstract:
  We present a multidimensional optimization problem that is formulated and
solved in the tropical mathematics setting. The problem consists of minimizing
a nonlinear objective function defined on vectors over an idempotent semifield
by means of a conjugate transposition operator, subject to constraints in the
form of linear vector inequalities. A complete direct solution to the problem
under fairly general assumptions is given in a compact vector form suitable for
both further analysis and practical implementation. We apply the result to
solve a multidimensional minimax single facility location problem with
Chebyshev distance and with inequality constraints imposed on the feasible
location area.


title: Mixed Human-Robot Team Surveillance

abstract:
  We study the mixed human-robot team design in a system theoretic setting
using the context of a surveillance mission. The three key coupled components
of a mixed team design are (i) policies for the human operator, (ii) policies
to account for erroneous human decisions, and (iii) policies to control the
automaton. In this paper, we survey elements of human decision-making,
including evidence aggregation, situational awareness, fatigue, and memory
effects. We bring together the models for these elements in human
decision-making to develop a single coherent model for human decision-making in
a two-alternative choice task. We utilize the developed model to design
efficient attention allocation policies for the human operator. We propose an
anomaly detection algorithm that utilizes potentially erroneous decision by the
operator to ascertain an anomalous region among the set of regions surveilled.
Finally, we propose a stochastic vehicle routing policy that surveils an
anomalous region with high probability. Our mixed team design relies on the
certainty-equivalent receding-horizon control framework.


title: Isospin Breaking Effects on the Lattice

abstract:
  Isospin symmetry is not exact and the corrections to the isosymmetric limit
are, in general, at the percent level. For gold plated quantities, such as
pseudoscalar meson masses or the kaon leptonic and semileptonic decay rates,
these effects are of the same order of magnitude of the errors quoted in
nowadays lattice calculations and cannot be neglected any longer. In this talk
I discuss the methods that have been developed in the last few years to
calculate isospin breaking corrections by starting from first principles
lattice simulations. In particular, I discuss how to perform a combined QCD+QED
lattice simulation and a renormalization prescription to be used in order to
separate QCD from QED isospin breaking effects. A brief review of recent
lattice results of isospin breaking effects on the hadron spectrum is also
included.


title:
A Mixture of Ancient and Modern Understanding Concerning the Distance
  and Motion of the Moon

abstract:
  Ptolemy's model of the Moon's motion implied that its distance varies by
nearly a factor of two, implying that its angular size should also vary by
nearly a factor of two. We present an analysis of 100 naked eye observations of
the Moon's angular size obtained over 1145 days, showing regular variations of
at least 3 arc minutes. Thus, ancient astronomers could have shown that a key
implication of Ptolemy's model was wrong. In modern times we attribute the
variation of distance of the Moon to the combined effect of the ellipticity of
the Moon's orbit and the perturbing effect of the Sun on the Earth-Moon system.
We show graphically how this affects the ecliptic longitudes and radial
distance of the Moon. The longitude and distance "anomalies" are correlated
with the Moon's phase. This is illustrated without any complex equations or
geometry.


title: Aggregation of Affine Estimators

abstract:
  We consider the problem of aggregating a general collection of affine
estimators for fixed design regression. Relevant examples include some commonly
used statistical estimators such as least squares, ridge and robust least
squares estimators. Dalalyan and Salmon (2012) have established that, for this
problem, exponentially weighted (EW) model selection aggregation leads to sharp
oracle inequalities in expectation, but similar bounds in deviation were not
previously known. While results indicate that the same aggregation scheme may
not satisfy sharp oracle inequalities with high probability, we prove that a
weaker notion of oracle inequality for EW that holds with high probability.
Moreover, using a generalization of the newly introduced $Q$-aggregation scheme
we also prove sharp oracle inequalities that hold with high probability.
Finally, we apply our results to universal aggregation and show that our
proposed estimator leads simultaneously to all the best known bounds for
aggregation, including $\ell_q$-aggregation, $q \in (0,1)$, with high
probability.


title: Test of conformal gravity with astrophysical observations

abstract:
  Since it can describe the rotation curves of galaxies without dark matter and
can give rise to accelerated expansion, conformal gravity attracts much
attention recently. As a theory of modified gravity, it is important to test
conformal gravity with astrophysical observations. Here we constrain conformal
gravity with SNIa and Hubble parameter data and investigate whether it suffers
from an age problem with the age of APM~08279+5255. We find conformal gravity
can accommodate the age of APM~08279+5255 at 3 $\sigma$ deviation, unlike most
of dark energy models which suffer from an age problem.


title: On Thermodynamics of 2d Black Holes in Brane Inflationary Potentials

abstract:
  Inspired from the inflation brane world cosmology, we study the
thermodynamics of a black hole solution in two dimensional dilaton gravity with
an arctangent potential background. We first derive the two dimensional black
hole geometry, then we examine its asymptotic behaviors. More precisely, we
find that such behaviors exhibit properties appearing in some known cases
including the Anti de Sitter and the Schwarzchild black holes. Using the
complex path method, we compute the Hawking radiation. The entropy function can
be related to the value of the potential at the horizon.


title: Morphology and mobility of synthetic colloidal aggregates

abstract:
  The relationship between geometric and dynamic properties of fractal-like
aggregates is studied in the continuum mass and momentum-transfer regimes. The
synthetic aggregates were generated by a cluster-cluster aggregation algorithm.
The analysis of their morphological features suggests that the fractal
dimension is a descriptor of a cluster's large-scale structure, whereas the
fractal prefactor is a local-structure indicator. For a constant fractal
dimension, the prefactor becomes also an indicator of a cluster's shape
anisotropy. The hydrodynamic radius of orientationally averaged aggregates was
calculated via molecule-aggregate collision rates determined from the solution
of a Laplace equation. An empirical expression that relates the aggregate
hydrodynamic radius to its radius of gyration and the number of primary
particles is proposed. The suggested expression depends only on geometrical
quantities, being independent of statistical (ensemble-averaged) properties
like the fractal dimension and prefactor. Hydrodynamic radius predictions for a
variety of fractal-like aggregates are in very good agreement with predictions
of other methods and literature values. Aggregate dynamic shape factors and
DLCA individual monomer hydrodynamic shielding factors are also calculated.


title:
Hadronic resonance production with the ALICE experiment in pp and Pb-Pb
  collisions at LHC energies

abstract:
  Hadronic resonances $\mathrm{K}^{*}(892)^{0}$, $\phi$(1020) and
$\Sigma(1385)^{\pm}$ have been measured by the ALICE experiment in pp
collisions at $\sqrt{s}=7$ TeV and in Pb-Pb collisions at
$\sqrt{s_{_\mathrm{NN}}}=2.76$ TeV. Transverse momentum spectra, particle
ratios, nuclear modification factor and comparison with model predictions are
discussed. In addition, ALICE results are compared with data obtained at RHIC
energy.


title:
Compact anti-de Sitter 3-manifolds and folded hyperbolic structures on
  surfaces

abstract:
  We prove that any nonabelian, non-Fuchsian representation of a surface group
into PSL(2,R) is the holonomy of a folded hyperbolic structure on the surface.
Using similar ideas, we establish that any non-Fuchsian representation rho of a
surface group into PSL(2,R) is strictly dominated by some Fuchsian
representation j, in the sense that the hyperbolic translation lengths for j
are uniformly larger than for rho; conversely, any Fuchsian representation j
strictly dominates some non-Fuchsian representation rho, whose Euler class can
be prescribed. This has applications to compact anti-de Sitter 3-manifolds.


title: Higher Hochschild cohomology of the Lubin-Tate ring spectrum

abstract:
  We give a method for computing factorization homology of $\oper{E}_n$-algebra
using as an input an algebraic version of higher Hochschild homology due to
Pirashvili. We then show how to compute higher Hochschild homology and
cohomology when the algebra is \'etale in a sense that we make precise. As an
application, we compute higher Hochschild cohomology of the Lubin-Tate ring
spectrum.


title: The Cram\'er Condition for the Curie-Weiss Model of SOC

abstract:
  We pursue the study of the Curie-Weiss model of self-organized criticality we
designed in arXiv:1301.6911. We extend our results to more general interaction
functions and we prove that, for a class of symmetric distributions satisfying
a Cram\'er condition $(C)$ and some integrability hypothesis, the sum $S_{n}$
of the random variables behaves as in the typical critical generalized Ising
Curie-Weiss model. The fluctuations are of order $n^{3/4}$ and the limiting law
is $k \exp(-\lambda x^{4})\,dx$ where $k$ and $\lambda$ are suitable positive
constants. In arXiv:1301.6911 we obtained these results only for distributions
having an even density.


title: Stability of germanene under tensile strain

abstract:
  The stability of germanene under biaxial tensile strain and the accompanying
modifications of the electronic properties are studied by density functional
theory. The phonon spectrum shows that up to $16\%$ strain the germanene
lattice is stable, where the Dirac cone shifts towards higher energy and
hole-doped Dirac states are achieved. The latter is due to weakening of the
Ge-Ge bonds and reduction of the s-p hybridization. Our calculated Gr\"uneisen
parameter shows a similar dependence on the strain as reported for silicene
(which is different from that of graphene).


title: Domination by positive weak* Dunford-Pettis operators on Banach lattices

abstract:
  Recently, J. H'michane et al. introduced the class of weak* Dunford-Pettis
operators on Banach spaces, that is, operators which send weakly compact sets
onto limited sets. In this paper the domination problem for weak*
Dunford-Pettis operators is considered. Let $S, T:E\rightarrow F$ be two
positive operators between Banach lattices $E$ and $F$ such that $0\leq S\leq
T$. We show that if $T$ is a weak$^{*}$ Dunford-Pettis operator and $F$ is
$\sigma$-Dedekind complete, then $S$ itself is weak* Dunford-Pettis.


title:
On Manin's conjecture for a certain singular cubic surface over
  imaginary quadratic fields

abstract:
  We prove Manin's conjecture over imaginary quadratic number fields for a
cubic surface with a singularity of type E_6.


title:
Particle invasion, survival, and non-ergodicity in 2D diffusion
  processes with space-dependent diffusivity

abstract:
  We study the thermal Markovian diffusion of tracer particles in a 2D medium
with spatially-varying diffusivity $D(r)$, mimicking recently measured,
heterogeneous maps of the apparent diffusion coefficient in biological cells.
For this heterogeneous diffusion process (HDP) we analyse the mean squared
displacement (MSD) of the tracer particles, the time averaged MSD, the spatial
probability density function, and the first passage time dynamics from the cell
boundary to the nucleus. Moreover we examine the non-ergodic properties of this
process which are important for the correct physical interpretation of time
averages of observables obtained from single particle tracking experiments.
From extensive computer simulations of the 2D stochastic Langevin equation we
present an in-depth study of this HDP. In particular, we find that the MSDs
along the radial and azimuthal directions in a circular domain obey anomalous
and Brownian scaling, respectively. We demonstrate that the time averaged MSD
stays linear as a function of the lag time and the system thus reveals a weak
ergodicity breaking. Our results will enable one to rationalise the diffusive
motion of larger tracer particles such as viruses or submicron beads in
biological cells.


title: Gamma Cascade Transition of 51V(n,g)V52 Reaction

abstract:
  The thermal neutron capture gamma radiations for 51V(n, g)52V reaction have
been studied at Dalat Nuclear Research Reactor (DNRR). The gamma two-step
cascade transition was measured by event-event coincidence spectrometer. The
added-neutron binding energy in 52V was measured as 7.31 MeV. Energy and
intensity transition of cascades were consistent with prediction of single
particle model. Further more, the spin and parity of levels were confined.


title:
On standard finite difference discretizations of the elliptic
  Monge-Ampere equation

abstract:
  Given an orthogonal lattice with mesh length h on a bounded convex domain, we
propose to approximate the Aleksandrov solution of the Monge-Ampere equation by
regularizing the data and discretizing the equation in a subdomain using the
standard finite difference method. The Dirichlet data is used to approximate
the solution in the remaining part of the domain. We prove the uniform
convergence on compact subsets of the solution of the discrete problems to an
approximate problem on the subdomain. The result explains the behavior of
methods based on the standard finite difference method and designed to
numerically converge to non-smooth solutions. We propose an algorithm which for
smooth solutions appears faster than the popular Newton's method with a high
accuracy for non smooth solutions. The convergence of the algorithm is
independent of how close to the numerical solution the initial guess is, upon
rescaling the equation and given a user's measure of the closeness of an
initial guess.


title: Nuclear Mixing Meters for Classical Novae

abstract:
  Classical novae are caused by mass transfer episodes from a main sequence
star onto a white dwarf via Roche lobe overflow. This material forms an
accretion disk around the white dwarf. Ultimately, a fraction of this material
spirals in and piles up on the white dwarf surface under electron-degenerate
conditions. The subsequently occurring thermonuclear runaway reaches hundreds
of megakelvin and explosively ejects matter into the interstellar medium. The
exact peak temperature strongly depends on the underlying white dwarf mass, the
accreted mass and metallicity, and the initial white dwarf luminosity.
Observations of elemental abundance enrichments in these classical nova events
imply that the ejected matter consists not only of processed solar material
from the main sequence partner but also of material from the outer layers of
the underlying white dwarf. This indicates that white dwarf and accreted matter
mix prior to the thermonuclear runaway. The processes by which this mixing
occurs require further investigation to be understood. In this work, we analyze
elemental abundances ejected from hydrodynamic nova models in search of
elemental abundance ratios that are useful indicators of the total amount of
mixing. We identify the abundance ratios $\Sigma$CNO/H, Ne/H, Mg/H, Al/H, and
Si/H as useful mixing meters in ONe novae. The impact of thermonuclear reaction
rate uncertainties on the mixing meters is investigated using Monte Carlo
post-processing network calculations with temperature-density evolutions of all
mass zones computed by the hydrodynamic models. We find that the current
uncertainties in the $^{30}$P($p$,$\gamma$)$^{31}$S rate influence the Si/H
abundance ratio, but overall the mixing meters found here are robust against
nuclear physics uncertainties. A comparison of our results with observations of
ONe novae provides strong constraints for classical nova models.


title:
The Polyakov loop in various representations in the confined phase of
  QCD

abstract:
  We analyze the expectation value of the Polyakov loop in the fundamental and
higher representations in the confined phase of QCD. We discuss a hadronic like
representation, and find that the Polyakov loop corresponds to a partition
function in the presence of a colored source, explaining its real and positive
character. Saturating the sum rules to intermediate temperatures requires a
large number of multipartonic excited states. By using constituent or bag
models, we find detailed low temperature scaling rules which depart from the
Casimir scaling and could be tested by lattice calculations.


title: Global inversion of nonsmooth mappings using pseudo-Jacobian matrices

abstract:
  We study the global inversion of a continuous nonsmooth mapping $f:
\mathbb{R}^n \rightarrow \mathbb{R}^n$, which may be non-locally Lipschitz. To
this end, we use the notion of pseudo-Jacobian map associated to f, introduced
by Jeyakumar and Luc, and we consider a related index of regularity for f. We
obtain a characterization of global inversion in terms of its index of
regularity. Furthermore, we prove that the Hadamard integral condition has a
natural counterpart in this setting, providing a sufficient condition for
global invertibility.


title: Explicit formulas of a generalized Ramanujan sum

abstract:
  Explicit formulas involving a generalized Ramanujan sum are derived. An
analogue of the prime number theorem is obtained and equivalences of the
Riemann hypothesis are shown. Finally, explicit formulas of Bartz are
generalized.


title:
Rectification of Weak Product Algebras over an Operad in Cat and Top and
  Applications

abstract:
  We develop an alternative to the May-Thomason construction used to compare
operad based infinite loop machines to that of Segal, which relies on weak
products. Our construction has the advantage that it can be carried out in
$Cat$, whereas their construction gives rise to simplicial categories. As an
application we show that a simplicial algebra over a $\Sigma$-free $Cat$ operad
$\mathcal{O}$ is functorially weakly equivalent to a $Cat$ algebra over
$\mathcal{O}$. When combined with the results of a previous paper, this allows
us to conclude that up to weak equivalences the category of
$\mathcal{O}$-categories is equivalent to the category of
$B\mathcal{O}$-spaces, where $B:Cat\to Top$ is the classifying space functor.
In particular, $n$-fold loop spaces (and more generally $E_n$ spaces) are
functorially weakly equivalent to classifying spaces of $n$-fold monoidal
categories. Another application is a change of operads construction within
$Cat$.


title:
Interpretation of the oscillation spectrum of HD 50230 - a failure of
  richness

abstract:
  Attempts to interpret the observed oscillation spectrum of the SPB star HD
50230 are reported. We argue that a nearly equidistant period spacing found in
the oscillation spectrum of the star is most likely accidental. The observed
period distribution requires excitation of modes with the degree $\ell>4$. Much
more may be learned from the rich oscillation spectrum of the star but most of
the work is still ahead of us.


title:
Analysis of strange-mode instability with time-dependent convection in
  hot massive stars

abstract:
  We carry out nonadiabatic analysis of strange-modes in hot massive stars with
time-dependent convection (TDC) for the first time. Although convective
luminosity in envelopes of hot massive stars is not as dominative as in stars
near the red edge of the classical Cepheid instability strip in the
Hertzsprung-Russell (H-R) diagram, we have found that the strange-mode
instability can be affected by the treatment of convection. However, existence
of the instability around and over the Humphreys-Davidson (H-D) limit is
independent of the treatment. This implies that the strange-mode instability
could be responsible for the lack of observed stars over the H-D limit
regardless of uncertainties on convection theories.


title: Draft Auctions

abstract:
  We introduce draft auctions, which is a sequential auction format where at
each iteration players bid for the right to buy items at a fixed price. We show
that draft auctions offer an exponential improvement in social welfare at
equilibrium over sequential item auctions where predetermined items are
auctioned at each time step. Specifically, we show that for any subadditive
valuation the social welfare at equilibrium is an $O(\log^2(m))$-approximation
to the optimal social welfare, where $m$ is the number of items. We also
provide tighter approximation results for several subclasses. Our welfare
guarantees hold for Bayes-Nash equilibria and for no-regret learning outcomes,
via the smooth-mechanism framework. Of independent interest, our techniques
show that in a combinatorial auction setting, efficiency guarantees of a
mechanism via smoothness for a very restricted class of cardinality valuations,
extend with a small degradation, to subadditive valuations, the largest
complement-free class of valuations. Variants of draft auctions have been used
in practice and have been experimentally shown to outperform other auctions.
Our results provide a theoretical justification.


title:
Classification of tight $C^{*}$-algebras over the one-point
  compactification of $\mathbb{N}$

abstract:
  We prove a strong classification result for a certain class of
$C^{*}$-algebras with primitive ideal space $\widetilde{\mathbb{N}}$, where
$\widetilde{\mathbb{N}}$ is the one-point compactification of $\mathbb{N}$.
This class contains the class of graph $C^{*}$-algebras with primitive ideal
space $\widetilde{\mathbb{N}}$. Along the way, we prove a universal coefficient
theorem with ideal-related $K$-theory for $C^{*}$-algebras over
$\widetilde{\mathbb{N}}$ whose $\infty$ fiber has torsion-free $K$-theory.


title: Sections in orthomodular structures of decompositions

abstract:
  There is a family of constructions to produce orthomodular structures from
modular lattices, lattices that are M and M*-symmetric, relation algebras, the
idempotents of a ring, the direct product decompositions of a set or group or
topological space, and from the binary direct product decompositions of an
object in a suitable type of category. We show that an interval [0, a] of such
an orthomodular structure constructed from A is again an orthomodular structure
constructed from some B built from A. When A is a modular lattice, this B is an
interval of A, and when A is an object in a category, this B is a factor of A.


title: Novel magnetic state in $d^4$ Mott insulators

abstract:
  We show that the interplay of strong Hubbard interaction $U$ and spin-orbit
coupling $\lambda$ in systems with $d^4$ electronic configuration leads to
several unusual magnetic phases. Most notably, we find that competition between
superexchange and spin-orbit coupling leads to a phase transition from a
non-magnetic state predicted by atomic physics to a novel magnetic state in the
large $U$ limit. We show that the local moment changes dramatically across this
phase transition, challenging the conventional wisdom that local moments are
robust against small perturbations in a Mott insulator. The Hund's coupling
plays an important role in determining the nature of the magnetism. We identify
candidate materials and present predictions for Resonant X-ray Scattering (RXS)
signatures of the unusual magnetism in $d^4$ Mott insulators.


title: Higgs Bosons in Extra Dimensions

abstract:
  In this paper, motivated by the recent discovery of a Higgs-like boson at the
LHC with a mass m_H\simeq 126 GeV, we review different models where the
hierarchy problem is solved by means of a warped extra dimension. In the
Randall-Sundrum model electroweak observables provide very strong bounds on the
mass of KK modes which motivates extensions to overcome this problem. Two
extensions are briefly discussed. One particular extension is based on the
deformation of the metric such that it strongly departs from the AdS_5
structure in the IR region while it goes asymptotically to AdS_5 in the UV
brane. This model has the IR brane close to a naked metric singularity (which
is outside the physical interval) characteristic of soft-walls constructions.
The proximity of the singularity provides a strong wave-function
renormalization for the Higgs field which suppresses the T and S parameters.
The second class of considered extensions are based on the introduction of an
extra gauge group in the bulk such that the custodial SU(2)_R symmetry is
gauged and protects the T parameter. By further enlarging the bulk gauge
symmetry one can find models where the Higgs is identified with the fifth
component of gauge fields and for which the Higgs potential, along with the
Higgs mass, can be dynamically determined by the Coleman-Weinberg mechanism.


title: On the Practical Application of Physical Anomalous Dimensions

abstract:
  We revive the idea of using physical anomalous dimensions in the QCD scale
evolution of deep-inelastic structure functions and their scaling violations
and present a detailed phenomenological study of its applicability. Differences
with results obtained in the conventional framework of scale-dependent quark
and gluon densities are discussed and traced back to the truncation of the
perturbative series at a given order in the strong coupling.


title:
SO(10) GUTs with large tensor representations on Noncommutative
  Space-time

abstract:
  We construct a noncommutative version of a general renormalizable SO(10) GUT
with Higgses in the 210, $\overline{126}, 45, 10$ and 120 irreps of SO(10) and
a Peccei-Quinn symmetry. Thus, we formulate the noncommutative counterpart of a
non-supersymmetric SO(10) GUT which has recently been shown to be consistent
with all the physics below $M_{GUT}$. The simplicity of our construction --the
simplicity of the Yukawa terms, in particular-- stems from the fact that the
Higgses of our GUT can be viewed as elements of the Clifford algebra
$\mathbb{C}\rm{l}_{10}(\mathbb{C})$; elements on which the SO(10) gauge
transformations act by conjugation. The noncommutative GUT we build contains
tree-level interactions among different Higgs species that are absent in their
ordinary counterpart as they are forbidden by SO(10) and Lorentz invariance.
The existence of these interactions helps to clearly distinguish noncommutative
Minkowski space-time from ordinary Minkowski space-time.


title: A Time-Dependent Dirichlet-Neumann Method for the Heat Equation

abstract:
  We present a waveform relaxation version of the Dirichlet-Neumann method for
parabolic problem. Like the Dirichlet-Neumann method for steady problems, the
method is based on a non-overlapping spatial domain decomposition, and the
iteration involves subdomain solves with Dirichlet boundary conditions followed
by subdomain solves with Neumann boundary conditions. However, each subdomain
problem is now in space and time, and the interface conditions are also
time-dependent. Using a Laplace transform argument, we show for the heat
equation that when we consider finite time intervals, the Dirichlet-Neumann
method converges, similar to the case of Schwarz waveform relaxation
algorithms. The convergence rate depends on the length of the subdomains as
well as the size of the time window. In this discussion, we only stick to the
linear bound. We illustrate our results with numerical experiments.


title: Private Matchings and Allocations

abstract:
  We consider a private variant of the classical allocation problem: given k
goods and n agents with individual, private valuation functions over bundles of
goods, how can we partition the goods amongst the agents to maximize social
welfare? An important special case is when each agent desires at most one good,
and specifies her (private) value for each good: in this case, the problem is
exactly the maximum-weight matching problem in a bipartite graph.
  Private matching and allocation problems have not been considered in the
differential privacy literature, and for good reason: they are plainly
impossible to solve under differential privacy. Informally, the allocation must
match agents to their preferred goods in order to maximize social welfare, but
this preference is exactly what agents wish to hide. Therefore, we consider the
problem under the relaxed constraint of joint differential privacy: for any
agent i, no coalition of agents excluding i should be able to learn about the
valuation function of agent i. In this setting, the full allocation is no
longer published---instead, each agent is told what good to get. We first show
that with a small number of identical copies of each good, it is possible to
efficiently and accurately solve the maximum weight matching problem while
guaranteeing joint differential privacy. We then consider the more general
allocation problem, when bidder valuations satisfy the gross substitutes
condition. Finally, we prove that the allocation problem cannot be solved to
non-trivial accuracy under joint differential privacy without requiring
multiple copies of each type of good.


title:
On 3-transposition groups generated by $\sigma$-involutions associated
  to c=4/5 Virasoro vectors

abstract:
  In this paper, we show that $\sigma$-involutions associated to extendable
c=4/5 Virasoro vectors generate a 3-transposition group in the automorphism
group of a vertex operator algebra (VOA). Several explicit examples related to
lattice VOA are also discussed in details. In particular, we show that the
automorphism group of the VOA $V_{K_{12}}^{\hat{\nu}}$ associated to the
Coxeter Todd lattice $K_{12}$ contains a subgroup isomorphic to
${}^+\Omega^{-}(8,3)$.


title: Sterile neutrinos in leptonic and semileptonic decays

abstract:
  We address the impact of a modified $W \ell \nu$ coupling on a wide range of
observables, such as $\tau$ leptonic and mesonic decays, leptonic decays of
pseudoscalar mesons, as well as semileptonic meson decays. In particular, we
concentrate on deviations from lepton flavour universality, focusing on the
ratios $R_{P} = \Gamma (P \to \ell \nu) / \Gamma (P \to \ell' \nu)$, with $P=K,
\pi, D, D_s$, $R(D)={\Gamma (B^+ \to D \tau^+ \nu)}/{\Gamma (B^+ \to D\ell^+
\nu)}$, $R \tau={\Gamma (\tau\to \mu\nu\nu)}/{\Gamma (\tau\to e\nu\nu)}$,
$R^{\ell \tau}_P=\Gamma(\tau\to P\nu)/\Gamma(P\to \ell \nu)$, and $\text{BR}(B
\to \tau \nu)$. We further consider leptonic gauge boson decays, such as $W\to
\ell \nu $ and $Z \to \nu \nu$. For all the above observables, we provide the
corresponding complete analytical expressions, derived for the case of massive
neutrinos. Working in the framework of the Standard Model extended by
additional sterile fermions, which mix with the active (left-handed) neutrinos,
we numerically study the impact of active-sterile mixings on the above
mentioned observables.


title: Polarization Diagnostics for Cool Core Cluster Emission Lines

abstract:
  The nature of the interaction between low-excitation gas filaments at ~10^4
K, seen in optical line emission, and diffuse X-ray emitting coronal gas at
~10^7 K in the centers of galaxy clusters remains a puzzle. The presence of a
strong, empirical correlation between the two gas phases is indicative of a
fundamental relationship between them, though as yet of undetermined cause. The
cooler filaments, originally thought to have condensed from the hot gas, could
also arise from a merger or the disturbance of cool circumnuclear gas by
nuclear activity. Here, we have searched for intrinsic line emission
polarization in cool core galaxy clusters as a diagnostic of fundamental
transport processes. Drawing on developments in solar astrophysics, direct
energetic particle impact induced polarization holds the promise to
definitively determine the role of collisional processes such as thermal
conduction in the ISM physics of galaxy clusters, while providing insight into
other highly anisotropic excitation mechanisms such as shocks, intense
radiation fields and suprathermal particles. Under certain physical conditions,
theoretical calculations predict of order ten percent polarization. Our
observations of the filaments in four nearby cool core clusters place stringent
upper limits (<0.1%) on the presence of emission line polarization, requiring
that if thermal conduction is operative, the thermal gradients are not in the
saturated regime. This limit is consistent with theoretical models of the
thermal structure of filament interfaces.


title:
The K-corrections to radial velocity curves of optical components in
  X-Ray Binaries. HMXB with weak X-ray heating

abstract:
  The radial velocity curves of optical components in X-ray binary systems can
differ from the radial velocity curves of their barycenters due to tidal
distortion, gravitational darkening, X-ray heating, etc. This motivated us to
investigate how the semiamplitudes of the radial velocity curves of these
optical components can depend on the binary-system parameters in a Roche model.
The K-correction is taken to be the ratio of the radial velocity semiamplitude
for a star in the Roche model to the corresponding value for the stellar
barycenter. K-corrections are tabulated for the optical stars in the massive
X-ray binaries Cen X-3, LMC X-4, SMC X-1, Vela X-1, and 4U 1538-52.


title:
MAGIC observations and multifrequency properties of the Flat Spectrum
  Radio Quasar 3C 279 in 2011

abstract:
  We study the multifrequency emission and spectral properties of the quasar 3C
279. We observed 3C 279 in very high energy (VHE, E>100GeV) gamma rays, with
the MAGIC telescopes during 2011, for the first time in stereoscopic mode. We
combine these measurements with observations at other energy bands: in high
energy (HE, E>100MeV) gamma rays from Fermi-LAT, in X-rays from RXTE, in the
optical from the KVA telescope and in the radio at 43GHz, 37GHz and 15GHz from
the VLBA, Mets\"ahovi and OVRO radio telescopes and optical polarisation
measurements from the KVA and Liverpool telescopes. During the MAGIC
observations (February to April 2011) 3C 279 was in a low state in optical,
X-ray and gamma rays. The MAGIC observations did not yield a significant
detection. These upper limits are in agreement with the extrapolation of the HE
gamma-ray spectrum, corrected for extragalactic background light absorption,
from Fermi-LAT. The second part of the MAGIC observations in 2011 was triggered
by a high activity state in the optical and gamma-ray bands. During the optical
outburst the optical electric vector position angle rotatated of about 180
degrees. There was no simultaneous rotation of the 43GHz radio polarisation
angle. No VHE gamma rays were detected by MAGIC, and the derived upper limits
suggest the presence of a spectral break or curvature between the Fermi-LAT and
MAGIC bands. The combined upper limits are the strongest derived to date for
the source at VHE and below the level of the previously detected flux by a
factor 2. Radiation models that include synchrotron and inverse Compton
emissions match the optical to gamma-ray data, assuming an emission component
inside the broad line region (BLR) responsible for the high-energy emission and
one outside the BLR and the infrared torus causing optical and low-energy
emission. We interpreted the optical polarisation with a bent trajectory model.


title: Discovery of the $^{151}$Eu $\alpha$ decay

abstract:
  We report on the first compelling observation of $\alpha$ decay of $^{151}$Eu
to the ground state of $^{147}$Pm. The measurement was performed using a 6.15 g
Li$_6$Eu(BO$_3$)$_3$ crystal operated as a scintillating bolometer. The Q-value
and half-life measured are: Q = 1948.9$\pm 6.9(stat.) \pm 5.1(syst.)$ keV, and
T$_{1/2}=\left( 4.62\pm0.95(stat.)\pm0.68(syst.)\right) \times 10^{18}$ y . The
half-life prediction of nuclear theory using the Coulomb and proximity
potential model are in good agreement with this experimental result.


title: Vertex finiteness for splittings of relatively hyperbolic groups

abstract:
  Consider a group G and a family $\mathcal{A}$ of subgroups of G. We say that
vertex finiteness holds for splittings of G over $\mathcal{A}$ if, up to
isomorphism, there are only finitely many possibilities for vertex stabilizers
of minimal G-trees with edge stabilizers in $\mathcal{A}$.
  We show vertex finiteness when G is a toral relatively hyperbolic group and
$\mathcal{A}$ is the family of abelian subgroups.
  We also show vertex finiteness when G is hyperbolic relative to virtually
polycyclic subgroups and $\mathcal{A}$ is the family of virtually cyclic
subgroups; if moreover G is one-ended, there are only finitely many minimal
G-trees with virtually cyclic edge stabilizers, up to automorphisms of G.


title: Model-independent aspects of the reaction $\bar{K} + N \to K + \Xi$

abstract:
  Various model-independent aspects of the $\bar{K} N \to K \Xi$ reaction are
investigated, starting from the determination of the most general structure of
the reaction amplitude for $\Xi$ baryons with $J^P=\frac12^\pm$ and
$\frac32^\pm$ and the observables that allow a complete determination of these
amplitudes. Polarization observables are constructed in terms of spin-density
matrix elements. Reflection symmetry about the reaction plane is exploited, in
particular, to determine the parity of the produced $\Xi$ in a
model-independent way. In addition, extending the work of Biagi
$\mathrm{\textit{et al. } [Z. Phys.\ C \textbf{34}, 175 (1987)]}$, a way is
presented of determining simultaneously the spin and parity of the ground state
of $\Xi$ baryon as well as those of the excited $\Xi$ states.


title:
A $N_f = 2 + 1 + 1$ "twisted" determination of the $b$-quark mass,
  $f_{B}$ and $f_{B_s}$

abstract:
  We present a lattice QCD determination of the $b$-quark mass and of the
$f_{B_s}$ and $f_B$ decay constants performed with $N_f = 2 + 1 + 1$ twisted
mass Wilson fermions. We have used simulations at three values of the lattice
spacing generated by ETMC with pion masses ranging from 210 to 440 MeV. To
obtain physical quantities we performed a combined chiral and continuum limit
and an extrapolation in the heavy quark mass from the charm to the $b$-quark
region using suitable ratios calculated at nearby heavy-quark masses having an
exactly known static limit. Our results are: $m_b(m_b) = 4.29 (13)$ GeV, $f_B =
196 (9)$ MeV, $f_{B_s} = 235 (9)$ MeV, $f_{B_s} / f_B = 1.201 (25)$,
$(f_{B_s}/f_B)/(f_K/f_\pi) = 1.007 (16)$ and $(f_{B_s}/f_B)/(f_{D_s}/f_D) =
1.008 (13)$.


title: A PAC-Bayesian bound for Lifelong Learning

abstract:
  Transfer learning has received a lot of attention in the machine learning
community over the last years, and several effective algorithms have been
developed. However, relatively little is known about their theoretical
properties, especially in the setting of lifelong learning, where the goal is
to transfer information to tasks for which no data have been observed so far.
In this work we study lifelong learning from a theoretical perspective. Our
main result is a PAC-Bayesian generalization bound that offers a unified view
on existing paradigms for transfer learning, such as the transfer of parameters
or the transfer of low-dimensional representations. We also use the bound to
derive two principled lifelong learning algorithms, and we show that these
yield results comparable with existing methods.


title: Gossip vs. Markov Chains, and Randomness-Efficient Rumor Spreading

abstract:
  We study gossip algorithms for the rumor spreading problem which asks one
node to deliver a rumor to all nodes in an unknown network. We present the
first protocol for any expander graph $G$ with $n$ nodes such that, the
protocol informs every node in $O(\log n)$ rounds with high probability, and
uses $\tilde{O}(\log n)$ random bits in total. The runtime of our protocol is
tight, and the randomness requirement of $\tilde{O}(\log n)$ random bits almost
matches the lower bound of $\Omega(\log n)$ random bits for dense graphs. We
further show that, for many graph families, polylogarithmic number of random
bits in total suffice to spread the rumor in $O(\mathrm{poly}\log n)$ rounds.
These results together give us an almost complete understanding of the
randomness requirement of this fundamental gossip process.
  Our analysis relies on unexpectedly tight connections among gossip processes,
Markov chains, and branching programs. First, we establish a connection between
rumor spreading processes and Markov chains, which is used to approximate the
rumor spreading time by the mixing time of Markov chains. Second, we show a
reduction from rumor spreading processes to branching programs, and this
reduction provides a general framework to derandomize gossip processes. In
addition to designing rumor spreading protocols, these novel techniques may
have applications in studying parallel and multiple random walks, and
randomness complexity of distributed algorithms.


title:
The CHESS survey of the L1157-B1 bow-shock: high and low excitation
  water vapor

abstract:
  Molecular outflows powered by young protostars strongly affect the kinematics
and chemistry of the natal molecular cloud through strong shocks resulting in
substantial modifications of the abundance of several species. As part of the
"Chemical Herschel Surveys of Star forming regions" guaranteed time key
program, we aim at investigating the physical and chemical conditions of H20 in
the brightest shock region B1 of the L1157 molecular outflow. We observed
several ortho- and para-H2O transitions using HIFI and PACS instruments on
board Herschel, providing a detailed picture of the kinematics and spatial
distribution of the gas. We performed a LVG analysis to derive the physical
conditions of H2O shocked material, and ultimately obtain its abundance. We
detected 13 H2O lines probing a wide range of excitation conditions. PACS maps
reveal that H2O traces weak and extended emission associated with the outflow
identified also with HIFI in the o-H2O line at 556.9 GHz, and a compact (~10")
bright, higher-excitation region. The LVG analysis of H2O lines in the
bow-shock show the presence of two gas components with different excitation
conditions: a warm (Tkin~200-300 K) and dense (n(H2)~(1-3)x10^6 cm-3) component
with an assumed extent of 10" and a compact (~2"-5") and hot, tenuous
(Tkin~900-1400 K, n(H2)~10^3-10^4 cm-3) gas component, which is needed to
account for the line fluxes of high Eu transitions. The fractional abundance of
the warm and hot H2O gas components is estimated to be (0.7-2)x10^{-6} and
(1-3)x10^{-4}, respectively. Finally, we identified an additional component in
absorption in the HIFI spectra of H2O lines connecting with the ground state
level, probably arising from the photodesorption of icy mantles of a
water-enriched layer at the edges of the cloud.


title:
Snowmass Computing Frontier: Computing for the Cosmic Frontier,
  Astrophysics, and Cosmology

abstract:
  This document presents (off-line) computing requrements and challenges for
Cosmic Frontier science, covering the areas of data management, analysis, and
simulations. We invite contributions to extend the range of covered topics and
to enhance the current descriptions.


title:
Caught in the act: Cluster `k+a' galaxies as a link between spirals and
  S0s

abstract:
  We use integral field spectroscopy of 13 disk galaxies in the cluster AC114
at z ~ 0.31 in an attempt to disentangle the physical processes responsible for
the transformation of spiral galaxies in clusters. Our sample is selected to
display a dominant young stellar population, as indicated by strong Hdelta
absorption lines in their integrated spectra. Most of our galaxies lack the
[OII] emission line, and hence ongoing star formation. They therefore possess
`k+a' spectra, indicative of a recent truncation of star formation, possibly
preceded by a starburst. Disky `k+a' galaxies are a promising candidate for the
intermediate stage of the transformation from star-forming spiral galaxies to
passive S0s.
  Our observations allow us to study the spatial distributions and the
kinematics of the different stellar populations within the galaxies. We used
three different indicators to evaluate the presence of a young population: the
equivalent width of Hdelta, the luminosity-weighted fraction of A stars, and
the fraction of the galaxy light attributable to simple stellar populations
with ages between 0.5 and 1.5 Gyr. We find a mixture of behaviours, but are
able to show that in most of galaxies the last episode of star-formation
occured in an extended disk, similar to preceeding generations of stars, though
somewhat more centrally concentrated.
  We thus exclude nuclear starbursts and violent gravitational interactions as
causes of the star formation truncation. Gentler mechanisms, such as
ram-pressure stripping or weak galaxy-galaxy interactions, appear to be
responsible for ending star-formation in these intermediate-redshift cluster
disk galaxies.


title:
$SU(1,1)$ coherent states for Dirac-Kepler-Coulomb problem in $D+1$
  dimensions with scalar and vector potentials

abstract:
  We decouple the Dirac's radial equations in $D+1$ dimensions with
Coulomb-type scalar and vector potentials through appropriate transformations.
We study each of these uncoupled second-order equations in an algebraic way by
using an $su(1,1)$ algebra realization. Based on the theory of irreducible
representations, we find the energy spectrum and the radial eigenfunctions. We
construct the Perelomov coherent states for the Sturmian basis, which is the
basis for the unitary irreducible representation of the $su(1,1)$ Lie algebra.
The physical radial coherent states for our problem are obtained by applying
the inverse original transformations to the Sturmian coherent states.


title:
Examples of topologically highly chromatic graphs with locally small
  chromatic number

abstract:
  Kierstead, Szemer\'edi, and Trotter showed that a graph with at most $\lfloor
r/(2n)\rfloor^n$ vertices such that each ball of radius $r$ in it is
$c$-colorable should have chromatic number at most $n(c-1)+1$. We show that
this estimate is sharp in $r$. Namely, for every $n$, $r$, and $c$ we construct
a graph $G$ containing $O((2rc)^{n-1}c)$ vertices such that $\chi(G)\geq
n(c-1)+1$, although each ball of radius $r$ in $G$ is $c$-colorable. The core
idea is the construction of a graph whose neighborhood complex is homotopy
equivalent to the join of neighborhood complexes of two given graphs.


title:
Second-order optimality conditions and Lagrange multiplier
  characterizations of the solution set in quasiconvex programming

abstract:
  Second-order optimality conditions for vector nonlinear programming problems
with inequality constraints are studied in this paper. We introduce a new
second-order constraint qualification, which includes Mangasarian-Fromovitz
constraint qualification as a particular case. We obtain necessary and
sufficient conditions for weak efficiency of problems with a second-order
pseudoconvex vector objective function and quasiconvex constraints. We also
derive Lagrange multiplier characterizations of the solution set of a scalar
problem with a second-order pseudoconvex objective function and quasiconvex
inequality constraints, provided that one of the solutions and the Lagrange
multipliers in the Karush-Kuhn-Tucker conditions are known. At last, we
introduce a notion of a second-order KKT-pseudoconvex problem with inequality
constraints. We derive sufficient and also necessary conditions for efficiency
of second-order KKT-pseudoconvex problems. Three examples are presented.


title:
The STARK-B database as a resource for \textquotedblleft STARK" widths
  and shifts data: State of advancement and program of development

abstract:
  \textquotedblleft Stark" broadening theories and calculations have been
extensively developed for about 50 years and can now be applied to many needs,
especially for accurate spectroscopic diagnostics and modeling. This requires
the knowledge of numerous collisional line profiles. Nowadays, the access to
such data via an online database becomes essential. STARK-B is a collaborative
project between the Astronomical Observatory of Belgrade and the Laboratoire
d'\'Etude du Rayonnement et de la mati\`ere en Astrophysique (LERMA). It is a
database of calculated widths and shifts of isolated lines of atoms and ions
due to electron and ion collisions (impacts). It is devoted to modeling and
spectroscopic diagnostics of stellar atmospheres and envelopes, laboratory
plasmas, laser equipments and technological plasmas. Hence, the domain of
temperatures and densities covered by the tables is wide and depends on the
ionization degree of the considered ion. STARK-B has been fully opened since
September 2008 and is in free access.
  The first stage of development was ended in autumn 2012, since all the
existing data calculated with the impact semiclassical-perturbation method and
code by Sahal-Br\'echot, Dimitrijevi\'c and coworkers have now been
implemented. We are now beginning the second stage of the development of
STARK-B. The state of advancement of the database and our program of
development are presented here, together with its context within VAMDC. VAMDC
(Virtual Atomic and Molecular Data Center) is an international consortium which
has built a secure, documented, flexible interoperable platform e-science
permitting an automated exchange of atomic and molecular data.