title:
Molecular-Brownian Correspondence in the Hard-sphere Dynamic
  Universality Class

abstract:
  We perform systematic simulation experiments on model systems with
soft-sphere repulsive interactions to test the predicted dynamic equivalence
between soft-sphere liquids with similar static structure. For this we compare
the simulated dynamics (mean squared displacement, intermediate scattering
function, {\alpha}-relaxation time, etc.) of different soft-sphere systems,
between them and with the hard-sphere liquid. We then show that the referred
dynamic equivalence does not depend on the (Newtonian or Brownian) nature of
the microscopic laws of motion of the constituent particles, and hence, applies
independently to colloidal and to atomic simple liquids. In addition, we verify
another more recently-proposed dynamic equivalence, this time between the
long-time dynamics of a Brownian fluid and its corresponding atomic liquid
(i.e., the atomic system with the same interaction potential).


title: Magnetic Reconnection in a Weakly Ionized Plasma

abstract:
  Magnetic reconnection in partially ionized plasmas is a ubiquitous phenomenon
spanning the range from laboratory to intergalactic scales, yet it remains
poorly understood and relatively little studied. Here, we present results from
a self-consistent multi-fluid simulation of magnetic reconnection in a weakly
ionized reacting plasma with a particular focus on the parameter regime of the
solar chromosphere. The numerical model includes collisional transport,
interaction and reactions between the species, and optically thin radiative
losses. This model improves upon our previous work in Leake et al. 2012
\cite{Leake2012} by considering realistic chromospheric transport coefficients,
and by solving a generalized Ohm's law that accounts for finite ion-inertia and
electron-neutral drag.
  We find that during the two dimensional reconnection of a Harris current
sheet with an initial width larger than the neutral-ion collisional coupling
scale, the current sheet thins until its width becomes less than this coupling
scale, and the neutral and ion fluids decouple upstream from the reconnection
site. During this process of decoupling, we observe reconnection faster than
the single-fluid Sweet-Parker prediction, with recombination and plasma outflow
both playing a role in determining the reconnection rate.
  As the current sheet thins further and elongates it becomes unstable to the
secondary tearing instability, and plasmoids are seen. The reconnection rate,
outflows and plasmoids observed in this simulation provide evidence that
magnetic reconnection in the chromosphere could be responsible for jet-like
transient phenomena such as spicules and chromospheric jets.


title: The nitrogen-vacancy colour centre in diamond

abstract:
  The nitrogen-vacancy (NV) colour centre in diamond is an important physical
system for emergent quantum technologies, including quantum metrology,
information processing and communications, as well as for various
nanotechnologies, such as biological and sub-diffraction limit imaging, and for
tests of entanglement in quantum mechanics. Given this array of existing and
potential applications and the almost 50 years of NV research, one would expect
that the physics of the centre is well understood, however, the study of the NV
centre has proved challenging, with many early assertions now believed false
and many remaining issues yet to be resolved. This review represents the first
time that the key empirical and ab initio results have been extracted from the
extensive NV literature and assembled into one consistent picture of the
current understanding of the centre. As a result, the key unresolved issues
concerning the NV centre are identified and the possible avenues for their
resolution are examined.


title: Horizontal symmetry in the algebraic approach of genetic code

abstract:
  Using concepts of physics of elementary particles concerning the breaking of
symmetry and grannd unified theory we propose to study with the algebraic
approximation the degeneracy finded in the genetic code with the incorporation
of a horizontal symmetry used in gauge theories to fit the contents of the
multiplets of the genetic code. It is used the algebraic approch of Hornos et.
al. \cite{main,PRL71,PRE,MPLB}. We propose an example for the incorporation of
horizontal symmetry to study mixtures of elements of the multiplets.


title: Constraint-based reachability

abstract:
  Iterative imperative programs can be considered as infinite-state systems
computing over possibly unbounded domains. Studying reachability in these
systems is challenging as it requires to deal with an infinite number of states
with standard backward or forward exploration strategies. An approach that we
call Constraint-based reachability, is proposed to address reachability
problems by exploring program states using a constraint model of the whole
program. The keypoint of the approach is to interpret imperative constructions
such as conditionals, loops, array and memory manipulations with the
fundamental notion of constraint over a computational domain. By combining
constraint filtering and abstraction techniques, Constraint-based reachability
is able to solve reachability problems which are usually outside the scope of
backward or forward exploration strategies. This paper proposes an
interpretation of classical filtering consistencies used in Constraint
Programming as abstract domain computations, and shows how this approach can be
used to produce a constraint solver that efficiently generates solutions for
reachability problems that are unsolvable by other approaches.


title: Petri Nets with Time and Cost

abstract:
  We consider timed Petri nets, i.e., unbounded Petri nets where each token
carries a real-valued clock. Transition arcs are labeled with time intervals,
which specify constraints on the ages of tokens. Our cost model assigns token
storage costs per time unit to places, and firing costs to transitions. We
study the cost to reach a given control-state. In general, a cost-optimal run
may not exist. However,we show that the infimum of the costs is computable.


title: On Consistency of Operational Transformation Approach

abstract:
  The Operational Transformation (OT) approach, used in many collaborative
editors, allows a group of users to concurrently update replicas of a shared
object and exchange their updates in any order. The basic idea of this approach
is to transform any received update operation before its execution on a replica
of the object. This transformation aims to ensure the convergence of the
different replicas of the object, even though the operations are executed in
different orders. However, designing transformation functions for achieving
convergence is a critical and challenging issue. Indeed, the transformation
functions proposed in the literature are all revealed incorrect.
  In this paper, we investigate the existence of transformation functions for a
shared string altered by insert and delete operations. From the theoretical
point of view, two properties - named TP1 and TP2 - are necessary and
sufficient to ensure convergence. Using controller synthesis technique, we show
that there are some transformation functions which satisfy only TP1 for the
basic signatures of insert and delete operations. As a matter of fact, it is
impossible to meet both properties TP1 and TP2 with these simple signatures.


title:
Effective Marking Equivalence Checking in Systems with Dynamic Process
  Creation

abstract:
  The starting point of this work is a framework allowing to model systems with
dynamic process creation, equipped with a procedure to detect symmetric
executions (ie., which differ only by the identities of processes). This allows
to reduce the state space, potentially to an exponentially smaller size, and,
because process identifiers are never reused, this also allows to reduce to
finite size some infinite state spaces. However, in this approach, the
procedure to detect symmetries does not allow for computationally efficient
algorithms, mainly because each newly computed state has to be compared with
every already reached state.
  In this paper, we propose a new approach to detect symmetries in this
framework that will solve this problem, thus enabling for efficient algorithms.
We formalise a canonical representation of states and identify a sufficient
condition on the analysed model that guarantees that every symmetry can be
detected. For the models that do not fall into this category, our approach is
still correct but does not guarantee a maximal reduction of state space.


title:
The equivariant simplicial de Rham complex and the classifying space of
  a semi-direct product group

abstract:
  We show that the cohomology group of the equivariant simplicial de Rham
complex is isomorphic to the cohomology group of the classifying space of a
semi-direct product group.


title:
A Gravitational Lens Model for the Lya Emitter, LAE 221724+001716 at
  z=3.1 in the SSA 22 Field

abstract:
  During the course of our Lyman continuum imaging survey, we found that the
spectroscopically confirmed Lya emitter LAE 221724+001716 at z = 3.10 in the
SSA 22 field shows strong Lyman continuum emission (lambda_rest ~ 900 A) that
escapes from this galaxy. However, another recent spectroscopic survey revealed
that the supposed Lyman continuum emission could arise from a foreground galaxy
at z = 1.76 if the emission line newly detected from the galaxy at lambda_obs ~
3360 A is Lya. If this is the case, as the angular separation between these two
galaxies is very small (~ 0.6"), LAE 221724+001716 at z = 3.10 could be
amplified by the gravitational lensing caused by this intervening galaxy. Here
we present a possible gravitational lens model for the system of LAE
221724+001716. First, we estimate the stellar mass of the intervening galaxy as
Mstar ~ 3.5x10^9 Msun from its UV luminosity and ~ 3.0x10^7--2.4x10^9 Msun
through the SED fitting. Then, we find that the gravitational magnification
factor ranges from 1.01 to 1.16 using the so-called singular isothermal sphere
model for strong lensing. While LAE 221724+001716 is the first system of an
LAE-LAE lensing reported so far, the estimated magnification factor is not so
significant because the stellar mass of the intervening galaxy is small.


title:
Spectra of Random Operators with absolutely continuous Integrated
  Density of States

abstract:
  The structure of the spectrum of random operators is studied. It is shown
that if the density of states measure of some subsets of the spectrum is zero,
then these subsets are empty. In particular follows that absolute continuity of
the IDS implies singular spectra of ergodic operators is either empty or of
positive measure. Our results apply to Anderson and alloy type models,
perturbed Landau Hamiltonians, almost periodic potentials and models which are
not ergodic.


title:
Physical Conditions of the Gas in an ALMA [CII]-identified Submillimetre
  Galaxy at z = 4.44

abstract:
  We present CO(2-1) observations of the submillimetre galaxy ALESS65.1
performed with the Australia Telescope Compact Array at 42.3 GHz. A previous
ALMA study of submillimetre galaxies in the Extended Chandra Deep Field South
detected [CII] 157.74 micron emission from this galaxy at a redshift of z =
4.44. No CO(2-1) emission was detected but we derive a firm upper limit to the
cold gas mass in ALESS65.1 of M_gas < 1.7 x 10^10 M_odot. The estimated gas
depletion timescale is <50 Myr, which is similar to other high redshift SMGs,
and consistent with z > 4 SMGs being the likely progenitors of massive
red-and-dead galaxies at z > 2. The ratio of the [CII], CO and far-infrared
luminosities implies a strong far-ultraviolet field of G_0 > 10^3, as seen in
Galactic star forming regions or local ULIRGs. The observed L_[CII]/L_FIR = 2.3
x 10^{-3} is high compared to local ULIRGs and, combined with L_[CII]/L_CO >
2700, it is consistent with ALESS65.1 either having an extended (several kpc)
[CII] emitting region or lower than solar metallicity.


title: Thermodynamics of Time Machines

abstract:
  In this note, a brief review of the consistent state approach to systems
containing closed timelike curves or similar devices is given, and applied to
the well known thermodynamic problem of Maxwell's demon. The 'third party
paradox' for acausal systems is defined and applied to CTC censorship and black
hole evaporation. Some traditional arguments for chronology protection are
re-examined.


title:
The Geography of Happiness: Connecting Twitter sentiment and expression,
  demographics, and objective characteristics of place

abstract:
  We conduct a detailed investigation of correlations between real-time
expressions of individuals made across the United States and a wide range of
emotional, geographic, demographic, and health characteristics. We do so by
combining (1) a massive, geo-tagged data set comprising over 80 million words
generated over the course of several recent years on the social network service
Twitter and (2) annually-surveyed characteristics of all 50 states and close to
400 urban populations. Among many results, we generate taxonomies of states and
cities based on their similarities in word use; estimate the happiness levels
of states and cities; correlate highly-resolved demographic characteristics
with happiness levels; and connect word choice and message length with urban
characteristics such as education levels and obesity rates. Our results show
how social media may potentially be used to estimate real-time levels and
changes in population-level measures such as obesity rates.


title: On a Class of Singular Douglas and Projectively flat Finsler Metrics

abstract:
  Singular Finsler metrics, such as Kropina metrics and $m$-Kropina metrics,
have a lot of applications in the real world. In this paper, we study a class
of singular Finsler metrics defined by a Riemann metric $\alpha$ and 1-form
$\beta$ and characterize those which are respectively Douglasian and locally
projectively flat in dimension $n\ge 3$ by some equations. Our study shows that
the main class induced is an $m$-Kropina metric plus a linear part on $\beta$.
For this class with $m\ne -1$, the local structure of projectively flat case is
determined, and it is proved that a Douglas $m$-Kropina metric must be
Berwaldian and a projectively flat $m$-Kropina metric must be locally
Minkowskian. It indicates that the singular case is quite different from the
regular one.


title:
On the Global Structure of Normal Forms for Slow-Fast Hamiltonian
  Systems

abstract:
  In the framework of Lie transform and the global method of averaging, the
normal forms of a multidimensional slow-fast Hamiltonian system are studied in
the case when the flow of the unperturbed (fast) system is periodic and the
induced S^1-action is not necessarily free and trivial. An intrinsic splitting
of the second term in a S^1-invariant normal form of first order is derived in
terms of the Hannay-Berry connection associated with the periodic flow.


title: Asymptotic power of likelihood ratio tests for high dimensional data

abstract:
  This paper considers the asymptotic power of likelihood ratio test (LRT) for
the identity test when the dimension p is large compared to the sample size n.
The asymptotic distribution of LRT under alternatives is given and an explicit
expression of the power is derived. A simulation study is carried out to
compare LRT with other tests. All these studies show that LRT is a powerful
test to detect eigenvalues around zero.
  Key words and phrases: Covariance matrix, High dimensional data, Identity
test, Likelihood ratio test, Power


title:
On a Class of Singular Projectively Flat Finsler Metrics with Constant
  Flag Curvature

abstract:
  Singular Finsler metrics, such as Kropina metrics and $m$-Kropina metrics,
have a lot of applications in the real world. In this paper, we classify a
class of singular $(\alpha,\beta)$-metrics which are locally projectively flat
with constant flag curvature in dimension $n= 2$ and $n \ge 3$ respectively.
Further, we determine the local structure of $m$-Kropina metrics and
particularly Kropina metrics which are projectively flat with constant flag
curvature and prove that such metrics must be locally Minkowskian but are not
necessarily flat-parallel.


title:
Kibble-Zurek scaling and its breakdown for spontaneous generation of
  Josephson vortices in Bose-Einstein condensates

abstract:
  Atomic Bose-Einstein condensates confined to a dual-ring trap support
Josephson vortices as topologically stable defects in the relative phase. We
propose a test of the scaling laws for defect formation by quenching a Bose gas
to degeneracy in this geometry. Stochastic Gross-Pitaevskii simulations reveal
a -1/4 power-law scaling of defect number with quench time for fast quenches,
consistent with the Kibble-Zurek mechanism. Slow quenches show stronger
quench-time dependence that is explained by the stability properties of
Josephson vortices, revealing the boundary of the Kibble-Zurek regime.
Interference of the two atomic fields enables clear long-time measurement of
stable defects, and a direct test of the Kibble-Zurek mechanism in
Bose-Einstein condensation.


title: Exploring the Effect of Noise on the Berry Phase

abstract:
  We make use of a superconducting qubit to study the effects of noise on
adiabatic geometric phases. The state of the system, an effective spin one-half
particle, is adiabatically guided along a closed path in parameter space and
thereby acquires a geometric phase. By introducing artificial fluctuations in
the control parameters, we measure the geometric contribution to dephasing for
a variety of noise powers and evolution times. Our results clearly show that
only fluctuations which distort the path lead to geometric dephasing. In a
direct comparison with the dynamic phase, which is path-independent, we observe
that the adiabatic geometric phase is less affected by noise-induced dephasing.
This observation directly points towards the potential of geometric phases for
quantum gates or metrological applications.


title:
An Asymptotic Expansion Formula for Up-and-Out Barrier Option Price
  under Stochastic Volatility Model

abstract:
  This paper derives a new semi closed-form approximation formula for pricing
an up-and-out barrier option under a certain type of stochastic volatility
model including SABR model by applying a rigorous asymptotic expansion method
developed by Kato, Takahashi and Yamada (2012). We also demonstrate the
validity of our approximation method through numerical examples.


title:
Detection of the Characteristic Pion-Decay Signature in Supernova
  Remnants

abstract:
  Cosmic rays are particles (mostly protons) accelerated to relativistic
speeds. Despite wide agreement that supernova remnants (SNRs) are the sources
of galactic cosmic rays, unequivocal evidence for the acceleration of protons
in these objects is still lacking. When accelerated protons encounter
interstellar material, they produce neutral pions, which in turn decay into
gamma rays. This offers a compelling way to detect the acceleration sites of
protons. The identification of pion-decay gamma rays has been difficult because
high-energy electrons also produce gamma rays via bremsstrahlung and inverse
Compton scattering. We detected the characteristic pion-decay feature in the
gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area
Telescope. This detection provides direct evidence that cosmic-ray protons are
accelerated in SNRs.


title: Arithmetic Circuit Lower Bounds via MaxRank

abstract:
  We introduce the polynomial coefficient matrix and identify maximum rank of
this matrix under variable substitution as a complexity measure for
multivariate polynomials. We use our techniques to prove super-polynomial lower
bounds against several classes of non-multilinear arithmetic circuits. In
particular, we obtain the following results :
  As our main result, we prove that any homogeneous depth-3 circuit for
computing the product of $d$ matrices of dimension $n \times n$ requires
$\Omega(n^{d-1}/2^d)$ size. This improves the lower bounds by Nisan and
Wigderson(1995) when $d=\omega(1)$.
  There is an explicit polynomial on $n$ variables and degree at most
$\frac{n}{2}$ for which any depth-3 circuit $C$ of product dimension at most
$\frac{n}{10}$ (dimension of the space of affine forms feeding into each
product gate) requires size $2^{\Omega(n)}$. This generalizes the lower bounds
against diagonal circuits proved by Saxena(2007). Diagonal circuits are of
product dimension 1.
  We prove a $n^{\Omega(\log n)}$ lower bound on the size of product-sparse
formulas. By definition, any multilinear formula is a product-sparse formula.
Thus, our result extends the known super-polynomial lower bounds on the size of
multilinear formulas by Raz(2006).
  We prove a $2^{\Omega(n)}$ lower bound on the size of partitioned arithmetic
branching programs. This result extends the known exponential lower bound on
the size of ordered arithmetic branching programs given by Jansen(2008).


title: Socially Stable Matchings

abstract:
  In two-sided matching markets, the agents are partitioned into two sets. Each
agent wishes to be matched to an agent in the other set and has a strict
preference over these potential matches. A matching is stable if there are no
blocking pairs, i.e., no pair of agents that prefer each other to their
assigned matches. In this paper we study a variant of stable matching motivated
by the fact that, in most centralized markets, many agents do not have direct
communication with each other. Hence even if some blocking pairs exist, the
agents involved in those pairs may not be able to coordinate a deviation. We
model communication channels with a bipartite graph between the two sets of
agents which we call the social graph, and we study socially stable matchings.
A matching is socially stable if there are no blocking pairs that are connected
by an edge in the social graph. Socially stable matchings vary in size and so
we look for a maximum socially stable matching. We prove that this problem is
NP-hard and, assuming the unique games conjecture, hard to approximate within a
factor of 3/2-{\epsilon}, for any constant {\epsilon}>0. We complement the
hardness results with a 3/2-approximation algorithm.


title: A Serre-Swan theorem for bundles of bounded geometry

abstract:
  The Serre-Swan theorem in differential geometry establishes an equivalence
between the category of smooth vector bundles over a smooth compact manifold
and the category of finitely generated projective modules over the unital ring
of smooth functions. This theorem is here generalized to manifolds of bounded
geometry. In this context it states that the category of Hilbert bundles of
bounded geometry is equivalent to the category of operator *-modules over the
operator *-algebra of continuously differentiable functions which vanish at
infinity. Operator *-modules are generalizations of Hilbert C*-modules where
C*-algebras have been replaced by a more flexible class of involutive algebras
of bounded operators: Operator *-algebras. They play an important role in the
study of the unbounded Kasparov product.


title: Demonic dominoes

abstract:
  In response to a challenge in a recent paper to measure the propagation speed
of the wave of collapse of an array of dominoes (the Domino Effect), a novel
method of measuring the speed of such waves has been developed using sound
recordings of the collapse and DEMON (Detection of Modulation on Noise)
analysis to extract the frequency of domino impacts and hence the speed of
propagation of the domino wave. This paper presents this method and a
discussion of the other published measurements and models and some comments on
the precess of mathematical modelling.


title:
Proton Cyclotron Waves Upstream from Mars: Observations from Mars Global
  Surveyor

abstract:
  We present a study on the properties of electromagnetic plasma waves in the
region upstream of the Martian bow shock, detected by the magnetometer and
electron reflectometer (MAG / ER) onboard the Mars Global Surveyor (MGS)
spacecraft during the period known as Science Phasing Orbits (SPO). The
frequency of these waves, measured in the MGS reference frame (SC), is close to
the local proton cyclotron frequency. Minimum variance analysis (MVA) shows
that these 'proton cyclotron frequency' waves (PCWs) are characterized - in the
SC frame - by a left-hand, elliptical polarization and propagate almost
parallel to the background magnetic field. They also have a small degree of
compressibility and an amplitude that decreases with the increase of the
interplanetary magnetic field (IMF) cone angle and radial distance from the
planet. The latter result supports the idea that the source of these waves is
Mars. In addition, we find that these waves are not associated with the
foreshock . Empirical evidence and theoretical approaches suggest that most of
these observations correspond to the ion-ion right hand (RH) mode originating
from the pick-up of ionized exospheric hydrogen. The left-hand (LH) mode might
be present in cases where the IMF cone angle is high. PCWs occur in 62% of the
time during SPO1 subphase, whereas occurrence drops to 8% during SPO2. Also,
SPO1 PCWs preserve their characteristics for longer time periods and have
greater degree of polarization and coherence than those in SPO2. We discuss
these results in the context of possible changes in the pick-up conditions from
SPO1 to SPO2, or steady, spatial inhomogeneities in the wave distribution. The
lack of influence from the Solar Wind's convective electric field upon the
location of PCWs indicates that there is no clear relation between the spatial
distribution of PCWs and that of pick-up ions.


title:
Carbon Abundances of Metal-Poor Star Determined from the C I 1.068-1.069
  micron Lines

abstract:
  A non-LTE analysis of C I lines at 1.068-1.069 micron was carried out for
selected 46 halo/disk stars covering a wide metallicity range (-3.7 <[Fe/H]<
+0.3), based on the spectral data collected with IRCS+AO188 of the Subaru
Telescope, in order to examine whether and how these strong neutral carbon
lines of multiplet 1 can be exploited for establishing stellar carbon
abundances, especially for very metal-poor stars where CH molecular lines have
been commonly used. These C I lines were confirmed to be clearly visible for
all stars down to [Fe/H] ~ -3.7, from which C abundances could be successfully
determined. The resulting [C/Fe] vs. [Fe/H] diagram revealed almost the same
trend established from previous studies. When the results for individual stars
are compared with the published data collected from various literature, while a
reasonable agreement is seen as a whole, a tendency is observed that our
abundances are appreciably higher than those from CH lines especially for very
metal-poor giants of low gravity. Since the abundances of these C I lines are
subject to rather large non-LTE corrections (typically by several tenths dex)
whose importance progressively grows as the metallicity is lowered, attention
should be paid to how the collisional rates (especially due to neutral
hydrogen) are treated in non-LTE calculations.


title: A Note on Smale Manifolds and Lorentzian Sasaki-Einstein Geometry

abstract:
  In this note, we construct new examples of Lorentzian Sasaki-Einstein (LSE)
metrics on Smale manifolds $M.$ It has already been established in \cite{Gmz2}
that such metrics exist on the so-called torsion free Smale manifolds, i.e. the
$k$-fold connected sum of $S^{2}\times S^{3}.$ Now, we show that LSE metrics
exist on Smale manifolds for which $H_{2}(M,\mathbb{Z})_{tor}$ is nontrivial.
In particular, we show that most simply-connected positive Sasakian rational
homology 5-spheres are also negative Sasakian (hence Lorentzian
Sasaki-Einstein). Moreover, we show that for each pair of positive integers
$(n,s)$ with $n,s >1$, there exists a Lorentzian Sasaki-Einstein Smale manifold
$M$ such that $H_{2}(M,{\mathbb{Z}})_{tors}=(\mathbb{Z}/n)^{2s}$. Finally, we
are able to construct so-called mixed Smale manifolds (connect sum of torsion
free Smale manifolds with rational homology spheres) which admit LSE metrics
and have arbitrary second Betti number. This gives infinitely many examples
which do not admit positive Sasakian structures. These results partially
address the open problems


title:
Differential Harnack inequalities for a family of sub-elliptic diffusion
  equations on Sasakian manifolds

abstract:
  We prove a version of differential Harnack inequality for a family of
sub-elliptic diffusions on Sasakian manifolds under certain curvature
conditions.


title:
High-resolution Imaging of the Gegenschein and the Geometric Albedo of
  Interplanetary Dust

abstract:
  We made optical observations of the Gegenschein using a
liquid-nitrogen-cooled wide-field camera, Wide-field Imager of Zodiacal light
with ARray Detector (WIZARD), between March 2003 and November 2006. We found a
narrow brightness enhancement superimposed on the smooth gradient of the
Gegenschein at the exact position of the antisolar point. Whereas the
Gegenschein morphology changed according to the orbital motion of the Earth,
the maximum brightness coincided with the antisolar direction throughout the
year. We compared the observed morphology of the Gegenschein with those of
models in which the spatial density of the interplanetary dust cloud was
considered and found that the volume scattering phase function had a narrow
backscattering enhancement. The morphology was reproducible with a spatial
distribution model for infrared zodiacal emission. It is likely that the
zero-phase peak (the so-called opposition effect) was caused by coherent
backscattering and/or shadow-hiding effects on the rough surfaces of individual
dust particles. These results suggest that big particles are responsible for
both zodiacal light and zodiacal emission. Finally, we derived the geometric
albedo of the smooth component of interplanetary dust, assuming big particles,
and obtained a geometric albedo of 0.06+-0.01. The derived albedo is in
accordance with collected dark micrometeorites and observed cometary dust
particles. We concluded that chondritic particles are dominant near Earth
space, supporting the recent theoretical study by dynamical simulation.


title:
Probing topological relation between high density and low density region
  of 2MASS with hexagon cells

abstract:
  We introduce a new 2-D hexagon technique to probe the topological structure
of the universe, in which we map regions of the sky with high and low galaxy
densities onto a 2-D lattice of hexagon unit cells, We define filled cells as
corresponding to high density regions and empty cells as corresponding to low
density region. The number of filled cells and empty cells are kept same by
controlling the size of the cells. By analyzing the six neighbors of each
hexagon we can get and compare statistical topological properties of the high
density and low density regions in the universe, in order to have a better
understanding of the evolution of the universe. We apply this hexagon method on
2MASS data and discover significant topological differences between the high
density and low density regions. Both regions have significant (>5 Sigma)
topological shifts from the binomial distribution or the random distribution.


title:
Report of the ICFA Beam Dynamics Workshop 'Accelerators for a Higgs
  Factory: Linear vs. Circular' (HF2012)

abstract:
  This paper is a summary report of the ICFA Beam Dynamics Workshop
'Accelerators for a Higgs Factory: Linear vs. Circular' (HF2012). It discusses
four types of accelerators as possible candidates for a Higgs factory: linear
e+e- colliders, circular e+e- colliders, muon collider and photon colliders.
The comparison includes: physics reach, performance (energy and luminosity),
upgrade potential, technology maturity and readiness, and technical challenges
requiring further R&D.


title: The Pricing of Multiple-Expiry Exotics

abstract:
  In this paper we extend Buchen's method to develop a new technique for
pricing of some exotic options with several expiry dates(more than 3 expiry
dates) using a concept of higher order binary option. At first we introduce the
concept of higher order binary option and then provide the pricing formulae of
$n$-th order binaries using PDE method. After that, we apply them to pricing of
some multiple-expiry exotic options such as Bermudan option, multi time
extendable option, multi shout option and etc. Here, when calculating the price
of concrete multiple-expiry exotic options, we do not try to get the formal
solution to corresponding initial-boundary problem of the Black-Scholes
equation, but explain how to express the expiry payoffs of the exotic options
as a combination of the payoffs of some class of higher order binary options.
Once the expiry payoffs are expressed as a linear combination of the payoffs of
some class of higher order binary options, in order to avoid arbitrage, the
exotic option prices are obtained by static replication with respect to this
family of higher order binaries.


title: Invariant and stationary measures for the SL(2,R) action on Moduli space

abstract:
  We prove some ergodic-theoretic rigidity properties of the action of SL(2,R)
on moduli space. In particular, we show that any ergodic measure invariant
under the action of the upper triangular subgroup of SL(2,R) is supported on an
invariant affine submanifold.
  The main theorems are inspired by the results of several authors on unipotent
flows on homogeneous spaces, and in particular by Ratner's seminal work.


title: New MOST Photometry of the 55 Cancri System

abstract:
  Since the discovery of its transiting nature, the super-Earth 55 Cnc e has
become one of the most enthusiastically studied exoplanets, having been
observed spectroscopically and photometrically, in the ultraviolet, optical and
infrared regimes. To this rapidly growing data set, we contribute 42 days of
new, nearly continuous MOST photometry of the 55 Cnc system. Our analysis of
these observations together with the discovery photometry obtained in 2011
allows us to determine the planetary radius (1.990$^{+0.084}_{-0.080}$ R_Earth)
and orbital period (0.7365417$^{+0.0000025}_{-0.0000028}$ days) of 55 Cnc e
with unprecedented precision. We also followed up on the out-of-transit phase
variation first observed in the 2011 photometry, and set an upper limit on the
depth of the planet's secondary eclipse, leading to an upper limit on its
geometric albedo of 0.6.


title:
Fluid description of the cooperative scattering of light by spherical
  atomic clouds

abstract:
  When a cold atomic gas is illuminated by a quasi-resonant laser beam,
light-induced dipole-dipole correlations make the scattering of light a
cooperative process. Once a fluid description is adopted for the atoms, many
scattering properties are captured by the definition of a complex refractive
index. The solution of the scattering problem is here presented for spherical
atomic clouds of arbitrary density profiles, such as parabolic densities
characteristic of ultra-cold clouds. A new solution for clouds with infinite
boundaries is derived, that is particularly useful for the Gaussian densities
of thermal atomic clouds. The presence of Mie resonances, a signature of the
cloud acting as a cavity for the light, is discussed. These resonances leave
their fingerprint in various observables such as the scattered intensity or in
the radiation pressure force, and can be observed by tuning the frequency of
the incident laser field or the atom number.


title: Inverse Nodal Problem for P-Laplacian energy-dependent Sturm-Liouville

abstract:
In this study, inverse nodal problem is solved for p-Laplacian Schr\"odinger
equation with energy-dependent potential with the Drichlet conditions.
Asymptotic estimates of eigenvalues, nodal points and nodal lengths are given
by using Pr\"ufer substitution. Especially, an explicit formula for potential
function is given by using nodal lengths. Results are more general than
classical p- Laplacian Sturm Liouville problem. For the proofs, it is used the
methods given in the references lav3, Wang.


title: Unification of Gravity and Electromagnetism Revisited

abstract:
  Unification of gravity and electromagnetism based on a theory with an affine
non-symmetric connection $\Gamma^\lambda_{\mu\nu} \neq \Gamma^\lambda_{\nu\mu}$
and $\Gamma_\mu = \Gamma^\lambda_{[\mu\lambda]}\neq 0$, proposed by S. N. Bose
in 1953, is revisited in the context of modern developments in high energy
physics. It is shown that electrogravity unification can be achieved at a {\em
premetric} stage, and that this unification based on {\em projective
invariance} is broken by matter fields, opening up the possibility of a unified
theory of all forces in which gravity emerges as a classical field. The theory
predicts $\alpha_{sym} = \frac{1}{9}$ in the projective invariant limit, where
$\alpha$ is the fine structure constant


title: On the Lipschitz stability of inverse nodal problem for dirac equation

abstract:
  Inverse nodal problem on Dirac operator is finding the parameters in the
boundary conditions, the number m and the potential function V in the Dirac
equations by using a set of nodal points of a component of two component vector
eigenfunctions as the given spectral data. In this study, we solve a stability
problem using nodal set of vector eigenfunctions and show that space of all V
functions is homeomorphic to the partition set of all space of asymptotically
equivalent nodal sequences induced by an equivalence relation. Furthermore, we
give a reconstruction formula for the potential function as a limit of a
sequence of functions and associated nodal data of one component of vector
eigenfunctions. Our method depends on the explicit asymptotic expressions of
the nodal points and nodal lengths and basically, this method is similar to [1,
2] which is given for Sturm-Liouville and Hill operators, respectively.


title:
Symmetry and Intertwining Operators for the Nonlocal Gross-Pitaevskii
  Equation

abstract:
  We consider the symmetry properties of an integro-differential
multidimensional Gross-Pitaevskii equation with a nonlocal nonlinear (cubic)
term in the context of symmetry analysis using the formalism of semiclassical
asymptotics. This yields a semiclassically reduced nonlocal Gross-Pitaevskii
equation, which can be treated as a nearly linear equation, to determine the
principal term of the semiclassical asymptotic solution. Our main result is an
approach which allows one to construct a class of symmetry operators for the
reduced Gross-Pitaevskii equation. These symmetry operators are determined by
linear relations including intertwining operators and additional algebraic
conditions. The basic ideas are illustrated with a 1D reduced Gross-Pitaevskii
equation. The symmetry operators are found explicitly, and the corresponding
families of exact solutions are obtained.


title: $F$-jumping and $F$-Jacobian ideals for hypersurfaces

abstract:
  We introduce two families of ideals, $F$-jumping ideals and $F$-Jacobian
ideals, in order to study the singularities of hypersurfaces in positive
characteristic. Both families are defined using the $D$-modules $M_{\alpha}$
that were introduced by Blickle, Musta\c{t}\u{a} and Smith. Using strong
connections between $F$-jumping ideals and generalized test ideals, we give a
characterization of $F$-jumping numbers for hypersurfaces. Furthermore, we give
an algorithm that determines whether certain numbers are $F$-jumping numbers.
In addition, we use $F$-Jacobian ideals to study intrinsic properties of the
singularities of hypersurfaces. In particular, we give conditions for
$F$-regularity. Moreover, $F$-Jacobian ideals behave similarly to Jacobian
ideals of polynomials. Using techniques developed to study these two new
families of ideals, we provide relations among test ideals, generalized test
ideals, and generalized Lyubeznik numbers for hypersurfaces.


title:
Signature of gravitational radiation in afterglow of short Gamma-Ray
  Bursts?

abstract:
  Short Gamma-Ray Bursts (GRBs), brief intense emission of $\gamma-$rays
characterized by a duration shorter than 2 seconds that are plausibly powered
by the coalescence of binary neutron stars, are believed to be strong
gravitational wave radiation (GWR) sources. The test of such a speculation has
been thought to be impossible until the performance of the detectors like
advanced LIGO. Recently there has been growing evidence for the formation of
highly-magnetized neutron star (i.e., magnetar) in the double neutron star
mergers. In this work we re-examine the interpretation of the X-ray plateau
followed by an abrupt decline detected in some short GRB afterglows within the
supramassive magnetar model and find that the maximum gravitational mass of the
non-rotating neutron stars is $\sim 2.3M_{\odot}$ and the observed duration of
some X-ray plateaus are significantly shorter than that expected in the
magnetic dipole radiation scenario, suggesting that the collapse of the
supramassive magnetars has been considerably enhanced by the energy loss via
GWR. Such a result demonstrates that the signature of GWR may have already
existed in current electromagnetic data of short GRBs.


title: Least-action principle and path-integral for classical mechanics

abstract:
  In this paper we show how the equations of motion of a superfield, which
makes its appearance in a path-integral approach to classical mechanics, can be
derived without the need of the least-action principle


title:
A Kushner-Stratonovich Monte Carlo Filter Applied to Nonlinear Dynamical
  System Identification

abstract:
  A Monte Carlo filter, based on the idea of averaging over characteristics and
fashioned after a particle-based time-discretized approximation to the
Kushner-Stratonovich (KS) nonlinear filtering equation, is proposed. A key
aspect of the new filter is the gain-like additive update, designed to
approximate the innovation integral in the KS equation and implemented through
an annealing-type iterative procedure, which is aimed at rendering the
innovation (observation-prediction mismatch) for a given time-step to a
zero-mean Brownian increment corresponding to the measurement noise. This may
be contrasted with the weight- based multiplicative updates in most particle
filters that are known to precipitate the numerical problem of weight collapse
within a finite-ensemble setting. A study to estimate the a-priori error bounds
in the proposed scheme is undertaken. The numerical evidence, presently
gathered from the assessed performance of the proposed and a few other
competing filters on a class of nonlinear dynamic system identification and
target tracking problems, is suggestive of the remarkably improved convergence
and accuracy of the new filter.


title: Identifying Glueball at 3.02 GeV in Baryonic $B$ Decays

abstract:
  We examine the nature of the unknown enhancement around 3 GeV observed by the
BABAR collaboration in the $m_{p\bar p}$ spectrum of the $\bar B^0\to p\bar p
D^0$ decay. Suspecting that the peak is a resonance, which can be neither
identified as a charmonium state, such as $\eta_c$ or $J/\psi$, nor classified
as one of the light-flavor mesons, we conclude that it corresponds to a
glueball fitted as X(3020) with $(m_X,\;\Gamma_X)=(3020\pm 8,\; 107\pm
30)\;\text{MeV}$, which could be the first glueball state above 3 GeV. This
state also appears in the $m_{p\bar p}$ spectrum of the $\bar B^0\to p\bar p
D^{*0}$ decay.


title: Anomaly mediation deformed by axion

abstract:
  We show that in supersymmetric axion models the axion supermultiplet obtains
a sizable F-term due to a non-supersymmetric dynamics and it generally gives
the gaugino masses comparable to the anomaly mediation contribution. Thus the
gaugino mass relation predicted by the anomaly mediation effect can be
significantly modified in the presence of axion to solve the strong CP problem.


title:
Atomistic Coupling between Magnetization and Lattice Dynamics from First
  Principles

abstract:
  We formulate a new scheme to study the combined magnetization and lattice
dynamics in magnets, so-called magnetoelastics. The coupling between
magnetization and lattice are considered through an expansion of
electron-phonon coupling, while the magnetization is coupled to electrons
through sd-like interaction. We show the that the time-scale of the
magnetization dynamics due to coupling between magnetic degrees of freedom and
electronic degrees of freedom can be transferred to lattice degrees of freedom
and therefore can give rise to lattice dynamics on the same time-scale. This
opens a new route to understand and treat ultrafast lattice dynamics induced by
magnetization dynamics. We also show that all the parameters necessary to
simulate this coupled lattice and magnetization dynamics can be obtained from
first-principles.


title:
Pad\'e approximants for improved finite-temperature spectral functions
  in the numerical renormalization group

abstract:
  We introduce an improved approach for obtaining smooth finite-temperature
spectral functions of quantum impurity models using the numerical
renormalization group (NRG) technique. It is based on calculating first the
Green's function on the imaginary-frequency axis, followed by an analytic
continuation to the real-frequency axis using Pad\'e approximants. The
arbitrariness in choosing a suitable kernel in the conventional broadening
approach is thereby removed and, furthermore, we find that the Pad\'e method is
able to resolve fine details in spectral functions with less artifacts on the
scale of omega ~ T. We discuss the convergence properties with respect to the
NRG calculation parameters (discretization, truncation cutoff) and the number
of Matsubara points taken into account in the analytic continuation. We test
the technique on the the single-impurity Anderson model and the Hubbard model
(within the dynamical mean-field theory). For the Anderson impurity model, we
discuss the shape of the Kondo resonance and its temperature dependence. For
the Hubbard model, we discuss the inner structure of the Hubbard bands in
metallic and insulating solutions at half-filling, as well as in the doped Mott
insulator. Based on these test cases we conclude that the Pad\'e approximant
approach provides more reliable results for spectral functions at low-frequency
scales of omega < T and that it is capable of resolving sharp spectral features
also at high frequencies. It outperforms broadening in most respects.


title: Transient Shear Banding in Time-dependent Fluids

abstract:
  We study the dynamics of shear-band formation and evolution using a simple
rheological model. The description couples the local structure and viscosity to
the applied shear stress. We consider in detail the Couette geometry, where the
model is solved iteratively with the Navier-Stokes equation to obtain the
time-evolution of the local velocity and viscosity fields. It is found that the
underlying reason for dynamic effects is the non-homogeneous shear
distribution, which is amplified due to a positive feedback between the flow
field and the viscosity response of the shear thinning fluid. This offers a
simple explanation for the recent observations of Transient Shear Banding in
time-dependent fluids. Extensions to more complicated rheological systems are
considered.


title:
Anamolous reduction of magnetic coercivity of graphene oxide and reduced
  graphene oxide upon cooling

abstract:
  In this report we present the temperature evolution of magnetic coercivity of
graphene oxide (GO) and reduced graphene oxide (RGO). We report an anamolous
decrease in coercivity of GO and RGO with decreasing temperature. We could
explain this anamolous behavior invoking the inherent presence of ripple in
graphene. We observe antiferromagnetic and ferromagnetic behavior at room
temperature for GO and RGO respectively, but at low temperatures both shows
paramagnetic behavior.


title: Flare-out condition of Morris-Thorne wormhole and finiteness of pressure

abstract:
  Wormhole is defined as the topological structure with the throat connecting
two asymptotically flat spaces. In order to have and maintain the structure of
the wormhole, there needs the geometrical flare-out condition, i.e., the
minimal size at throat. In the case of Morris-Thorne type wormhole, the
condition is given by the huge surface tension compared to the energy density
times the square of the light speed. In this paper, we re-considered the
flare-out condition for the wormhole with the Einstein equation, checked the
finiteness of the pressure, and investigated its physical meaning.


title:
Influence of electromagnetic fields on the evolution of initially
  homogeneous and isotropic universe

abstract:
  Simple exact solutions presented here describe the universes which spatial
geometries are asymptotically homogeneous and isotropic near the initial
singularity, but which evolution goes under the influence of primordial
magnetic fields. In all these "deformed" Friedmann models (spatially flat, open
or closed), the initial magnetic fields are concentrated near some axis of
symmetry and their lines are the circles -- the lines of the azimuthal
coordinate $\varphi$. Caused by the expansion of the universe, the
time-dependence of a magnetic field induces (in accordance with the Faraday
law) the emergence of source-free electric fields. In comparison with the
Friedmann models, the cosmological expansion goes with acceleration in spatial
directions across the magnetic field, and with deceleration along the magnetic
lines, so that in flat and open models, in fluid comoving coordinates, the
lengths of $\varphi$-circles of large enough radius or for late enough times
decrease and vanish for $t\to\infty$. This means that in flat and open models,
we have a partial dynamical closure of space-time at large distances from the
axis, i.e. from the regions where the electromagnetic fields in our solutions
are concentrated. To get simple exact solutions of the Einstein-Maxwell and
perfect fluid equations, we assume for the perfect fluid (which supports the
isotropic and homogeneous "background" Friedmann geometries) rather exotic,
stiff matter equation of state $\varepsilon=p$. However, it seems reasonable to
expect that similar effects might take place in the mutual dynamics of geometry
and strong electromagnetic fields in the universes with more realistic matter
equations of state.


title: Quantum Plasmonics: Nonlocal effects in coupled nanowire dimer

abstract:
  The optical response of a coupled nanowire dimer is studied using a fully
quantum mechanical approach. The translational invariance of the system allows
to apply the time--dependent density functional theory for the plasmonic dimer
with the largest size considered so far in quantum calculations. Detailed
comparisons with results from classical electromagnetic calculations based on
local and non local hydrodynamic response, as well as with results of the
recently developed quantum corrected model is performed. We show that electron
tunneling and dynamical screening are the major nonlocal quantum effects
determining the plasmonic modes and field enhancement in the system. Account
for the electron tunneling at small junction sizes allows semi-quantitative
description of quantum results within classical framework. We also discuss the
shortcomings of classical treatments using non-local dielectric permittivities
based on hydrodynamic models. Finally, the implications of the actual position
of the screening charge density for the plasmon ruler applications are
demonstrated.


title: How to reduce the crack density in drying colloidal material?

abstract:
  The drying of a colloidal dispersion can result in a gel phase defined as a
porous matrix saturated in solvent. During the drying process, high mechanical
stresses are generated. When these stresses exceed the strength of the
material, they can be released in the formation of cracks. This process
strongly depends on both the mechanical properties of the material and the way
the gel consolidates. In this report, we give experimental evidences that the
number of cracks formed in the consolidating film depend on the drying rate,
the nature of the solvent and the mechanical properties of the colloidal
particles.


title: A new synthesis of matter and gravity: A nongravitating scalar field

abstract:
  We present a new manifestation of the nonlinearity of the gravity-matter
interactions. We show explicitly that there exists a nongravitating dynamical
scalar-field solution in Eddington-inspired Born-Infeld gravity. This kind of
solution has not been found in previous literatures based on general
relativity, or other modified-gravity theories. The nongravitating solution
obtained in this work is unstable to perturbations.


title: Two-term partial tilting complexes over Brauer tree algebras

abstract:
  In this paper we describe all indecomposable two-term partial tilting
complexes over a Brauer tree algebra with multiplicity 1 using a criterion for
a minimal projective presentation of a module to be a partial tilting complex.
As an application we describe all two-term tilting complexes over Brauer star
algebra and compute their endomorphism rings.


title: Bundle vs. network conductivity of carbon nanotubes separated by type

abstract:
  We report wide-range optical investigations on transparent conducting
networks made from separated (semiconducting, metallic) and reference (mixed)
single-walled carbon nanotubes, complemented by transport measurements.
Comparing the intrinsic frequency-dependent conductivity of the nanotubes with
that of the networks, we conclude that higher intrinsic conductivity results in
better transport properties, indicating that the properties of the nanotubes
are at least as much important as the contacts. We find that HNO3 doping offers
a larger improvement in transparent conductive quality than separation.
Spontaneous dedoping occurs in all samples but is most effective in films made
of doped metallic tubes, where the sheet conductance returns close to its
original value within 24 hours.


title:
CORE: Augmenting Regenerating-Coding-Based Recovery for Single and
  Concurrent Failures in Distributed Storage Systems

abstract:
  Data availability is critical in distributed storage systems, especially when
node failures are prevalent in real life. A key requirement is to minimize the
amount of data transferred among nodes when recovering the lost or unavailable
data of failed nodes. This paper explores recovery solutions based on
regenerating codes, which are shown to provide fault-tolerant storage and
minimum recovery bandwidth. Existing optimal regenerating codes are designed
for single node failures. We build a system called CORE, which augments
existing optimal regenerating codes to support a general number of failures
including single and concurrent failures. We theoretically show that CORE
achieves the minimum possible recovery bandwidth for most cases. We implement
CORE and evaluate our prototype atop a Hadoop HDFS cluster testbed with up to
20 storage nodes. We demonstrate that our CORE prototype conforms to our
theoretical findings and achieves recovery bandwidth saving when compared to
the conventional recovery approach based on erasure codes.


title: On some basic properties of Leibniz algebras

abstract:
  This paper gives an overview of some basic properties of Leibniz algebras.
Some of the results were known earlier, but in the article they are accompanied
by new simple proofs. Some of the results are new. The article can be viewed as
a digest or a mini-manual for the basic theory of Leibniz algebras


title:
Equation of states and transport properties of warm dense beryllium: A
  quantum molecular dynamics study

abstract:
  We have calculated the equation of states, the viscosity and self-diffusion
coefficients, and electronic transport coefficients of beryllium in the warm
dense regime for densities from 4.0 to 6.0 g/cm$^{3}$ and temperatures from 1.0
to 10.0 eV by using quantum molecular dynamics simulations. The principal
Hugoniot is accordant with underground nuclear explosive and high power laser
experimental results up to $\sim$ 20 Mbar. The calculated viscosity and
self-diffusion coefficients are compared with the one-component plasma model,
using effective charges given by the average-atom model. The Stokes-Einstein
relationship, which presents the relationship between the viscosity and
self-diffusion coefficients, is found to hold fairly well in the strong
coupling regime. The Lorenz number, which is the ratio between thermal and
electrical conductivities, is computed via Kubo-Greenwood formula and compared
to the well-known Wiedemann-Franz law in the warm dense region.


title: Alphabet-Dependent String Searching with Wexponential Search Trees

abstract:
  It is widely assumed that $O(m+\lg \sigma)$ is the best one can do for
finding a pattern of length $m$ in a compacted trie storing strings over an
alphabet of size $\sigma$, if one insists on linear-size data structures and
deterministic worst-case running times [Cole et al., ICALP'06]. In this
article, we first show that a rather straightforward combination of well-known
ideas yields $O(m+\lg\lg \sigma)$ deterministic worst-case searching time for
static tries.
  Then we move on to dynamic tries, where we achieve a worst-case bound of
$O(m+\frac{\lg^{2}\lg\sigma}{\lg\lg\lg\sigma})$ per query or update, which
should again be compared to the previously known $O(m+\lg\sigma)$ deterministic
worst-case bounds [Cole et al., ICALP'06], and to the alphabet
\emph{in}dependent $O(m+\sqrt{\lg n/\lg\lg n})$ deterministic worst-case bounds
[Andersson and Thorup, SODA'01], where $n$ is the number of nodes in the trie.
The basis of our update procedure is a weighted variant of exponential search
trees which, while simple, might be of independent interest.
  As one particular application, the above bounds (static and dynamic) apply to
suffix trees. There, an update corresponds to pre- or appending a letter to the
text, and an additional goal is to do the updates quicker than rematching
entire suffixes. We show how to do this in $O(\lg\lg n +
\frac{\lg^{2}\lg\sigma}{\lg\lg\lg\sigma})$ time, which improves the previously
known $O(\lg n)$ bound [Amir et al., SPIRE'05].


title: Vector boson+jets as background to top-quark physics at Tevatron and LHC

abstract:
  I review here the latest measurements related to vector boson production in
association with light or heavy flavor jets at the Tevatron and at the LHC. The
methods to estimate the W+jets and Z+jets background in top-quark analyses are
also presented.


title:
On prediction of regulatory genes by analysis of C.elegans functional
  networks

abstract:
  Connectivity networks have recently become widely used in biology due to
increasing amounts of information on the physical and functional links between
individual proteins. This connectivity data provides valuable material for
expanding our knowledge far beyond the experimentally validated via
mathematical analysis and theoretical predictions of new functional
interactions. In this paper we demonstrate an application of several algorithms
developed for the ranking of potential gene-expression regulators within the
context of an associated network. We analyze how different types of
connectivity between genes and proteins affect the topology of the integral
C.elegans functional network and thereby validate algorithmic performance. We
demonstrate the possible definition of co-expression gene clusters within a
network context from their specific motif distribution signatures. We also show
that the method based on the shortest path function (SPF) applied to gene
interactions sub-network of the co-expression gene cluster, efficiently
predicts novel regulatory transcription factors (TFs). Simultaneous application
of other methods, including only interactions with neighborhood genes, allows
rapid ranking of potential regulators that could be functionally linked with
the group of co-expressed genes. Predicting functions of regulators for a
cluster of ribosomal/mRNA metabolic genes we highlight a role of mRNA
translation and decay in a longevity of organisms.


title:
Eigenvectors and scalar products for long range interacting spin chains
  II: the finite size effects

abstract:
  In this note, we study the eigenvectors and the scalar products the
integrable long-range deformation of a XXX spin chain which is solved exactly
by algebraic Bethe ansatz, and it coincides in the bulk with the Inozemtsev
spin chain. At the closing point it contains a defect which effectively removes
the wrapping interactions. Here we concentrate on determining the defect term
for the first non-trivial order in perturbation in the deformation parameter
and how it affects the Bethe ansatz equations. Our study is motivated by the
relation with the dilatation operator of the N = 4 gauge theory in the su(2)
sector.


title:
The Stability of Weakly Collisional Plasmas with Thermal and Composition
  Gradients

abstract:
  Over the last decade, substantial efforts have been devoted to understanding
the stability properties, transport phenomena, and long-term evolution of
weakly-collisional, magnetized plasmas which are stratified in temperature.
These studies have improved our understanding of the physics governing the
intra-cluster medium (ICM), but assumed that ICM is a homogeneous. This,
however, might not be a good approximation if heavy elements sediment in the
inner region of the galaxy cluster. In this paper, we analyze the stability of
a weakly-collisional, magnetized plane-parallel atmosphere which is stratified
in both temperature and composition. This allows us to discuss for the first
time the dynamics of weakly-collisional environments where heat conduction,
momentum transport, and ion-diffusion are anisotropic with respect to the
direction of the magnetic field. We show that, depending on the relative signs
and magnitudes of the gradients in the temperature and the mean molecular
weight, the plasma can be subject to a wide variety of unstable modes which
include modifications to the magnetothermal instability (MTI), the
heat-flux-driven buoyancy instability (HBI), and overstable gravity modes
previously studied in homogeneous media. We discuss the astrophysical
implications of our findings for a representative galaxy cluster where helium
has sedimented. Our findings suggest that the core insulation that results from
the magnetic field configurations that arise as a natural consequence of the
HBI, which would be MTI stable in a homogeneous medium, could be alleviated if
the mean molecular weight gradient is steep enough, i.e., $(\nabla \mu)/\mu >
(\nabla T)/T$. This study constitutes a first step toward understanding the
interaction between magnetic turbulence and the diffusion of heavy elements in
the ICM. (abridged)


title: A geometric interpretation of the Hasse-Arf theorem

abstract:
  We give an a geometric interpretation of the Hasse-Arf theorem for function
fields using the recently proved Oort conjecture.


title: Identifying Lyman Alpha Emitters powered by AGNs

abstract:
  Lyman Alpha Emitters (LAEs) are usually thought to be powered by star
formation. It has been recently reported that a fraction of LAEs at redshift
z~3-4 hosts an Active Galactic Nuclei (AGN). If an AGN is present it could be
obscured and undetectable in X-rays, but yet dominate the Lya luminosity. We
examine the properties of these AGN-powered LAEs at high redshift (z>=6) using
radiative transfer cosmological simulations and obtain a reliable criterion to
identify them from their observed \Lya line and surface brightness. We find
that these sources should have: (a) negative line weighted skewness, S_w <0,
and (b) surface brightness profiles FWHM >= 1.5". This parameter space cannot
be populated by starburst LAEs. Thus, LAEs satisfying this criterion would be
strong candidates for the presence of a hidden AGN powering their luminosity.


title: Linearized internal functionals for anisotropic conductivities

abstract:
  This paper concerns the reconstruction of an anisotropic conductivity tensor
in an elliptic second-order equation from knowledge of the so-called power
density functionals. This problem finds applications in several coupled-physics
medical imaging modalities such as ultrasound modulated electrical impedance
tomography and impedance-acoustic tomography. We consider the linearization of
the nonlinear hybrid inverse problem. We find sufficient conditions for the
linearized problem, a system of partial differential equations, to be elliptic
and for the system to be injective. Such conditions are found to hold for a
lesser number of measurements than those required in recently established
explicit reconstruction procedures for the nonlinear problem.


title:
Extragalactic Compact Sources in the Planck Sky and their Cosmological
  Implications

abstract:
  The Planck satellite has proved to be a very successful mission, which has
been operating flawlessly for more than 36 months. Its main purpose is to map
the anisotropies of the CMB radiation at 9 frequencies, between 30 and 857 GHz,
with unprecedented resolution and sensitivity. After a description of the
properties and cosmological aims of Planck, we review the results obtained
during the first 1.6 full sky surveys relative to compact extragalactic sources
and their implications. The most recent and efficient methods and filters for
compact source detection in the presence of Gaussian noise and CMB anisotropies
are discussed. The first surveys of Planck have enabled the detection of about
200 galaxy clusters, by the SZ effect, and from several hundreds to many
thousands of extragalactic point sources (EPS), presented in the Planck ERCSC.
We review the results on the SZ effect in galaxy clusters. We discuss the
possibilities of future Planck data to study clusters through the SZ effect and
the interesting possibilities of combining these data with X ray observations.
These EPS can be classified into two main source classes: radio sources, at
intermediate to high z; far IR sources, typically at very z. Planck number
counts of EPS at LFI frequencies are in agreement with WMAP counts. A clear
steepening of the mean spectral index of bright radio sources is observed above
70 GHz, that can be interpreted in terms of a break frequency in their spectra.
For nearby dusty galaxies, Planck observations find evidence of colder dust,
with T < 20 K, than has previously been found. More recently, the number counts
of bright local dusty galaxies and of synchrotron sources have been measured by
Planck at submm wavelengths. Planck has provided interesting results on the
angular distribution of CIB anisotropies, allowing us to put new constraints on
clustering properties of dusty galaxies at high z.


title:
Characterization of affine automorphisms and ortho-order automorphisms
  of quantum probabilistic maps

abstract:
  In quantum mechanics, often it is important for the representation of quantum
system to study the structure-preserving bijective maps of the quantum system.
Such maps are also called isomorphisms or automorphisms. In this note, using
the Uhlhorn-type of Wigner's theorem, we characterize all affine automorphisms
and ortho-order automorphisms of quantum probabilistic maps.


title:
Non-integral form of the Gross-Pitaevskii equation for polarized
  molecules

abstract:
  The Gross-Pitaevskii equation for polarized molecules is an
integro-differential equation, consequently it is complicated for solving. We
find a possibility to represent it as a non-integral nonlinear Schrodinger
equation, but this equation should be coupled with two linear equations
describing electric field. These two equations are the Maxwell equations. We
recapture the dispersion of collective excitations in the three dimensional
electrically polarized BEC with no evolution of the electric dipole moment
directions. We trace the contribution of the electric dipole moment. We
explicitly consider the contribution of the electric dipole moment in the
interaction constant for the short-range interaction. We show that the spectrum
of dipolar BEC reveals no instability at repulsive short-range interaction.
Nonlinear excitations are also considered. We present dependence of the bright
soliton characteristics on the electric dipole moment.


title:
Faithful Solid State Optical Memory with Dynamically Decoupled Spin Wave
  Storage

abstract:
  We report an optical memory in a rare earth doped crystal with long storage
times, up to 20 ms, together with an optical bandwidth of 1.5 MHz. This is
obtained by transferring optical coherences to nuclear spin coherences, which
were then protected against environmental noise by dynamical decoupling. With
this approach, we achieved a 33 fold increase in spin wave storage time over
the intrinsic spin coherence lifetime. Comparison between different decoupling
sequences indicates that sequences insensitive to initial spin coherence
increase retrieval efficiency. Finally, an interference experiment shows that
relative phases of input pulses are preserved through the whole storage process
with a visibility close to 1, demonstrating the usefulness of dynamical
decoupling for extending the storage time of quantum memories.


title:
Gapless interface states at the junction between two topological
  insulators

abstract:
  We consider a junction between two topological insulators, and calculate the
properties of the interface states with an effective low energy Hamiltonian for
topological insulators with a single cone on the surface. This system bears a
close resemblance to bilayer graphene, as both result from the hybridization of
Dirac cones. We find gapless interface states not only when the helicity
direction of the topological surface states are oppositely oriented, but they
can also exist if they are equally oriented. Furthermore, we find that the
existence of the interface states can be understood from the closing of the
bulk gap when the helicity changes orientation. Recently, superluminal
tachyonic excitations were also claimed to exist at the interface between
topological insulators. However, here we show that these interface states do
not exist.


title: Lower bounds for the circuit size of partially homogeneous polynomials

abstract:
  In this paper we associate to each multivariate polynomial $f$ that is
homogeneous relative to a subset of its variables a series of polynomial
families $P_\lambda (f)$ of $m$-tuples of homogeneous polynomials of equal
degree such that the circuit size of any member in $P_\lambda (f)$ is bounded
from above by the circuit size of $f$. This provides a method for obtaining
lower bounds for the circuit size of $f$ by proving $(s,r)$-(weak) elusiveness
of the polynomial mapping associated with $P_\lambda (f)$. We discuss some
algebraic methods for proving the $(s,r)$-(weak) elusiveness. We also improve
estimates in the normal homogeneous-form of an arithmetic circuit obtained by
Raz in \cite{Raz2009} which results in better lower bounds for circuit size
(Lemma \ref{lem:cor38}, Remark \ref{rem:cor38}).
  Our methods yield non-trivial lower bound for the circuit size of several
classes of multivariate homogeneous polynomials (Corollary \ref{cor:412},
Example \ref{ex:bi}).


title: Variations of paleointensity in the Paleogene

abstract:
  Behavior of the geomagnetic field intensity in the Paleogene from sedimentary
rocks of the Russian Plate was investigated. It is revealed that in the
beginning of the Paleogene alternating of paleointensity variations of little
amplitude (about 0.5 Ho, where Ho is the value of modern geomagnetic field
taken as 40 mkT) and bursts of large amplitude (up to 5 Ho) took place. At the
end of the Paleogene paleointensity variations occur only with a little
amplitude.


title:
Extensions of the time-dependent density functional based tight-binding
  approach

abstract:
  The time-dependent density functional based tight-binding (TD-DFTB) approach
is generalized to account for fractional occupations. In addition, an on-site
correction leads to marked qualitative and quantitative improvements over the
original method. Especially, the known failure of TD-DFTB for the description
of \sigma -> \pi* and n -> \pi* excitations is overcome. Benchmark calculations
on a large set of organic molecules also indicate a better description of
triplet states. The accuracy of the revised TD-DFTB method is found to be
similar to first principles TD-DFT calculations at a highly reduced
computational cost. As a side issue, we also discuss the generalization of the
TD-DFTB method to spin-polarized systems. In contrast to an earlier study
[Trani et al., JCTC 7 3304 (2011)], we obtain a formalism that is fully
consistent with the use of local exchange-correlation functionals in the ground
state DFTB method.


title: Dynamical Properties of Discrete Reaction Networks

abstract:
  Reaction networks are commonly used to model the evolution of populations of
species subject to transformations following an imposed stoichiometry. This
paper focuses on the efficient characterisation of dynamical properties of
Discrete Reaction Networks (DRNs). DRNs can be seen as modelling the underlying
discrete nondeterministic transitions of stochastic models of reactions
networks. In that sense, any proof of non-reachability in DRNs directly applies
to any concrete stochastic models, independently of kinetics laws and
constants. Moreover, if stochastic kinetic rates never vanish, reachability
properties are equivalent in the two settings. The analysis of two global
dynamical properties of DRNs is addressed: irreducibility, i.e., the ability to
reach any discrete state from any other state; and recurrence, i.e., the
ability to return to any initial state. Our results consider both the
verification of such properties when species are present in a large copy
number, and in the general case. The obtained necessary and sufficient
conditions involve algebraic conditions on the network reactions which in most
cases can be verified using linear programming. Finally, the relationship of
DRN irreducibility and recurrence with dynamical properties of stochastic and
continuous models of reaction networks is discussed.


title:
Extended Hubbard model with renormalized Wannier wave functions in the
  correlated state III: Statistically consistent Gutzwiller approximation and
  the metallization of atomic solid hydrogen

abstract:
  We extend our previous approach (Eur. Phys. J. B, \textbf{74}, 63(2010)) to
modeling correlated electronic states and the metal-insulator transition by
applying the so-called \emph{statistically consistent Gutzwiller approximation}
(SGA) to carry out self-consistent calculations of the renormalized
single-particle Wannier functions in the correlated state. The transition to
the Mott-Hubbard insulating state at temperature T=0 is of weak first order
even if antiferromagnetism is disregarded. The magnitude of the introduced
self-consistent magnetic correlation field is calculated and shown to lead to a
small magnetic moment in the magnetically uniform state. Realistic value of the
applied magnetic field has a minor influence on the metallic-state
characteristics near the Mott-Hubbard lcalization threshold. The whole analysis
has been carried out for an extended Hubbard model on a simple cubic (SC)
lattice and the evolution of physical properties is analyzed as a function of
the lattice parameter for the renormalized 1s-type Wannier functions. Quantum
critical scaling of the selected physical properties is analyzed as a function
of the lattice constant $R\rightarrow R_c=4.1 a_0$, where $R_c$ is the critical
value for metal-insulator transition and $a_0=0.53 \AA$ is the Bohr radius. A
critical pressure for metallization of solid atomic hydrogen is estimated and
is $\sim 10^2 GPa$.


title:
Under-approximating Cut Sets for Reachability in Large Scale Automata
  Networks

abstract:
  In the scope of discrete finite-state models of interacting components, we
present a novel algorithm for identifying sets of local states of components
whose activity is necessary for the reachability of a given local state. If all
the local states from such a set are disabled in the model, the concerned
reachability is impossible. Those sets are referred to as cut sets and are
computed from a particular abstract causality structure, so-called Graph of
Local Causality, inspired from previous work and generalised here to finite
automata networks. The extracted sets of local states form an
under-approximation of the complete minimal cut sets of the dynamics: there may
exist smaller or additional cut sets for the given reachability. Applied to
qualitative models of biological systems, such cut sets provide potential
therapeutic targets that are proven to prevent molecules of interest to become
active, up to the correctness of the model. Our new method makes tractable the
formal analysis of very large scale networks, as illustrated by the computation
of cut sets within a Boolean model of biological pathways interactions
gathering more than 9000 components.


title:
Powerful and efficient energy harvester with resonant-tunneling quantum
  dots

abstract:
  We propose a nanoscale heat engine that utilizes the physics of resonant
tunneling in quantum dots in order to transfer electrons only at specific
energies. The nanoengine converts heat into electrical current in a
multiterminal geometry which permits one to separate current and heat flows. By
putting two quantum dots in series with a hot cavity, electrons that enter one
lead are forced to gain a prescribed energy in order to exit the opposite lead,
transporting a single electron charge. This condition yields an ideally
efficient heat engine. The energy gain is a property of the composite system
rather than of the individual dots. It is therefore tunable to optimize the
power while keeping a much larger level spacing for the individual quantum
dots. Despite the simplicity of the physical model, the optimized rectified
current and power is larger than any other candidate nano-engine. The ability
to scale the power by putting many such engines into a two-dimensional layered
structure gives a paradigmatic system for harvesting thermal energy at the
nanoscale. We demonstrate that the high power and efficiency of the layered
structure persists even if the quantum dots exhibit some randomness.


title: Rationality of some tetragonal loci

abstract:
  We prove that the moduli space of tetragonal curves of genus g>6 is rational
when g is congruent to 1, 2, 5, 6, 9, 10 modulo 12 and not equal to 9, 45.


title:
Gamma-ray emitting radio galaxies at hard X-rays: Seyfert core or jet
  emission?

abstract:
  A number of radio galaxies has been detected by Fermi/LAT in the gamma-ray
domain. In some cases, like Cen A and M 87, these objects have been seen even
in the TeV range by Cherenkov telescopes. Whereas the gamma-ray emission is
likely to be connected with the non-thermal jet emission, dominating also the
radio band, the situation is less clear at hard X-rays. While the smoothly
curved continuum emission and the overall spectral energy distribution indicate
a non-thermal emission, other features such as the iron line emission and the
low variability appear to be rather of Seyfert type, i.e. created in the
accretion disk and corona around the central black hole.
  We investigate several prominent cases using combined X-ray and gamma-ray
data in order to constrain the possible contributions of the jet and the
accretion disk to the overall spectral energy distribution in radio galaxies.
Among the three sources we study, three different origins of the hard X-ray
flux can be identified. The emission can be purely non-thermal and caused by
the jet, as in the case of M 87, or thermal inverse Compton emission from the
Seyfert type core (Cen A), or appears to be a superposition of non-thermal and
thermal inverse Compton emission, as we observe in 3C 111. Gamma-ray bright
radio galaxies host all kinds of AGN cores, Seyfert 1 and 2, BL Lac objects,
and also LINER.


title:
Regular frequency patterns in the young delta Scuti star HD 261711
  observed by the CoRoT and MOST satellites

abstract:
  We concentrate on an asteroseismological study of HD 261711, a rather hot
delta Scuti type pulsating member of the young open cluster NGC 2264 located at
the blue border of the instability region. HD 261711 was discovered to be a
pre-main sequence delta Scuti star using the time series photometry obtained by
the MOST satellite in 2006. High-precision, time-series photometry of HD 261711
was obtained by the MOST and CoRoT satellites in 4 separate new observing runs
that are put into context with the star's fundamental atmospheric parameters
obtained from spectroscopy. With the new MOST data set from 2011/12 and the two
CoRoT light curves from 2008 and 2011/12, the delta Scuti variability was
confirmed and regular groups of frequencies were discovered. The two pulsation
frequencies identified in the data from the first MOST observing run in 2006
are confirmed and 23 new delta Scuti-type frequencies were discovered using the
CoRoT data. Weighted average frequencies for each group are related to l=0 and
l=1 p-modes. Evidence for amplitude modulation of the frequencies in two groups
is seen. The effective temperature was derived to be 8600$\pm$200 K, log g is
4.1$\pm$0.2, and the projected rotational velocity is 53$\pm$1km/s. Using our
Teff value and the radius of 1.8$\pm$0.5 Rsun derived from SED fitting, we get
a log L/Lsun of 1.20$\pm$0.14 which agrees well to the seismologically
determined values of 1.65 Rsun and, hence, a log L/Lsun of 1.13. The radial
velocity of 14$\pm$2 km/s we derived for HD 261711, confirms the star's
membership to NGC 2264. Our asteroseismic models suggest that HD 261711 is a
delta Scuti-type star close to the zero-age main sequence (ZAMS) with a mass of
1.8 to 1.9Msun. HD 261711 is either a young ZAMS star or a late PMS star just
before the onset of hydrogen-core burning.


title:
Evidence for length-dependent wire expansion, filament dedensification
  and consequent degradation of critical current density in Ag-alloy sheathed
  Bi-2212 wires

abstract:
  It is well known that longer Bi-2212 conductors have significantly lower
critical current density (Jc) than shorter ones, and recently it has become
clear that a major cause of this reduction is internal gas pressure generated
during heat treatment, which expands the wire diameter and dedensifies the
Bi-2212 filaments. Here we report on the length-dependent expansion of 5 to 240
cm lengths of state-of-the-art, commercial Ag alloy-sheathed Bi-2212 wire after
full and some partial heat treatments. Detailed image analysis along the wire
length shows that the wire diameter increases with distance from the ends,
longer samples often showing evident damage and leaks provoked by the internal
gas pressure. Comparison of heat treatments carried out just below the melting
point and with the usual melt process makes it clear that melting is crucial to
developing high internal pressure. The decay of Jc away from the ends is
directly correlated to the local wire diameter increase, which decreases the
local Bi-2212 filament mass density and lowers Jc, often by well over 50%. It
is clear that control of the internal gas pressure is crucial to attaining the
full Jc of these very promising round wires and that the very variable
properties of Bi-2212 wires are due to the fact that this internal gas pressure
has so far not been well controlled.


title: Type Ia Supernova Models and Progenitor Scenarios

abstract:
  We review some recent developments in theoretical studies on the connection
between the progenitor systems of Type Ia supernovae (SNe Ia) and the explosion
mechanisms. (1) DD-subCh: In the merging of double C+O white dwarfs (DD
scenario), if the carbon detonation is induced near the white dwarf (WD)
surface in the early dynamical phase, it could result in the (effectively)
sub-Chandrasekhar mass explosion. (2) DD-Ch: If no surface C-detonation is
ignited, the WD could grow until the Chandrasekhar mass is reached, but the
outcome depends on whether the quiescent carbon shell burning is ignited and
burns C+O into O+Ne+Mg. (3) SD-subCh: In the single degenerate (SD) scenario,
if the He shell-flashes grow strong to induce a He detonation, it leads to the
sub-Chandra explosion. (4) SD-Ch: If the He-shell flashes are not strong
enough, they still produce interesting amount of Si and S near the surface of
C+O WD before the explosion. In the Chandra mass explosion, the central density
is high enough to produce electron capture elements, e.g., stable Ni-58.
Observations of the emission lines of Ni in the nebular spectra provides useful
diagnostics of the sub-Chandra vs. Chandra issue. The recent observations of
relatively low velocity carbon near the surface of SNe Ia provide also
interesting constraint on the explosion models.


title: On algebras which are inductive limits of Banach spaces

abstract:
  We introduce algebras which are inductive limits of Banach spaces and carry
inequalities which are counterparts of the inequality for the norm in a Banach
algebra. We then define an associated Wiener algebra, and prove the
corresponding version of the well-known Wiener theorem. Finally, we consider
factorization theory in these algebra, and in particular, in the associated
Wiener algebra.


title: Detecting quantum backflow by the density of a Bose-Einstein Condensate

abstract:
  Quantum backflow is a classically forbidden effect consisting in a negative
flux for states with negligible negative momentum components. It has never been
observed experimentally so far. We derive a general relation that connects
backflow with a critical value of the particle density, paving the way for the
detection of backflow by a density measurement. To this end, we propose an
explicit scheme with Bose-Einstein condensates, at reach with current
experimental technologies. Remarkably, the application of a positive momentum
kick, via a Bragg pulse, to a condensate with a positive velocity may cause a
current flow in the negative direction.


title: On non-minimal coupling of the inflaton

abstract:
  The non-minimal coupling of the inflaton to gravity, $\xi R\phi^2$, is known
to alleviate the smallness (fine-tuning) of the quartic coupling $\lambda$ in
the chaotic inflation with $\phi^4$ potential. A large $\xi$ is required to
obtain the correct CMB power spectrum while we find that a small value $\sim
1/6$ seems to be preferred from spectral index. There are issues related to
conformal transformations, choice of frame and natural value(s) of $\xi$ for a
given potential. We revisit some of these issues and invoke certain field
theoretic arguments in order to address the same. A rather strong and general
conclusion reached, based on the requirements of renormalizability and
finiteness of specific matrix elements in a quantum theory, is that it is
generically not possible to eliminate the non-minimal coupling by going from
the Jordan to the Einstein frame via conformal transformations. We also comment
on Higgs inflation.


title: Light Curve Models for SN 2009dc

abstract:
  Simplified explosion models of super-Chandrasekhar-mass C-O white dwarfs
(WDs) are constructed with parameters such as WD mass and Ni-56 mass. Their
light curves are obtained by solving one-dimensional equations of radiation
hydrodynamics, and compared with the observations of SN 2009dc, one of the
overluminous Type Ia supernovae, to estimate its properties. As a result, the
progenitor of SN 2009dc is suggested to be a 2.2- to 2.4-solar-mass C-O WD with
1.2 to 1.4 solar masses of Ni-56, if the extinction by its host galaxy is
negligible.


title:
Constraints on possible age spreads within young massive clusters in the
  Large Magellanic Cloud

abstract:
  Recent studies have shown that the observed main-sequence turn-off (MSTO) in
colour-magnitude diagrams of intermediate age (1-2 Gyr) clusters in the LMC are
broader than would be nominally expected for a simple stellar population. This
has led to the suggestion that such clusters may host multiple stellar
populations, with age spreads of 100-500 Myr. However, at intermediate ages,
spreads of this magnitude are difficult to discern and alternative explanations
have been put forward (e.g., stellar rotation, interacting binaries). A
prediction of the age-spread scenario is that younger clusters in the LMC, with
similar masses and radii, should also show significant age spreads. In younger
clusters (i.e., 40-300 Myr) such large age spreads should be readily apparent.
We present an analysis of the colour-magnitude diagrams of two massive young
clusters in the LMC (NGC 1856 and NGC 1866) and show that neither have such
large age spreads, in fact, both are consistent with a single burst of
star-formation (sigma(age) < 35 Myr). This leads us to conclude that either the
intermediate age clusters in the LMC are somehow special or that the broadened
MSTOs are not due to an age spread within the clusters.


title: One-dimensional chaos in a system with dry friction: analytical approach

abstract:
  We introduce a new analytical method, which allows to find out chaotic
dynamics in non-smooth dynamical systems. A simple mechanical system consisting
of a mass and a dry friction element is considered as an example. The
corresponding mathematical model is represented. We show that the considered
dynamical system is a skew product over a piecewise smooth mapping of a segment
(a base map). For this base map we demonstrate there is a domain of parameters
where a robust chaotic dynamics can be observed. Namely, we prove existence of
an infinite set of periodic points of arbitrarily big period. Moreover, a
reduction of the considered map is semi-conjugated to a shift on the set of
one-sided infinite boolean sequences. Also, we find conditions, sufficient for
existence of a superstable periodic point of this map. The obtained result
partially solves a general problem: theoretical confirmation of chaotic and
periodic regimes numerically and experimentally observed for models of
percussion drilling.


title: Search for First Generation Leptoquarks in ep Collisions at HERA

abstract:
  A search for first generation scalar and vector leptoquarks produced in ep
collisions is performed by the H1 Collaboration at HERA. The full H1 data
sample is used in the analysis, corresponding to an integrated luminosity 446
pb^-1. No evidence for the production of leptoquarks is observed in final
states with a large transverse momentum electron or with large missing
transverse momentum, and constraints on leptoquark models are derived. For
leptoquark couplings of electromagnetic strength lambda=0.3, first generation
leptoquarks with masses up to 800 GeV are excluded at 95% confidence level.


title: The DPHEP Study Group: Data Preservation in High Energy Physics

abstract:
  An inter-experimental study group, DPHEP, was formed in 2009 to
systematically investigate the technical and organisational aspects of data
preservation and long-term analysis in high-energy physics, a subject which had
hitherto lacked clarity in the field. The study group includes representation
from all major high-energy physics collider-based experiments and laboratories,
as well as computing centres and funding agencies. A major report was released
in May 2012, greatly expanding on the ideas contained in a preliminary
publication three years earlier, and providing a more solid set of
recommendations, not only concerning data preservation and its implementation
in high-energy physics, but also the future direction and organisational model
of the study group. A brief description of the DPHEP Study Group and some of
the key messages from the major report are presented.


title: Search for Lepton Flavour Violation at HERA

abstract:
  A search for second and third generation scalar and vector leptoquarks
produced in ep collisions via the lepton flavour violating processes ep to mu-X
and ep to tau-X is performed by the H1 Collaboration at HERA. The full H1 ep
data sample taken at a centre-of-mass energy of 319 GeV is used for the
analysis, corresponding to an integrated luminosity of 411 pb^-1. No evidence
for the production of such leptoquarks is observed in the H1 data. Leptoquarks
produced in ep collisions with a coupling strength of lambda=0.3 and decaying
with the same coupling strength to a muon-quark pair or a tau-quark pair are
excluded at 95% confidence level up to leptoquark masses of 712 GeV and 479
GeV, respectively.


title: Observation of SN2011fe with INTEGRAL. I. Pre--maximum phase

abstract:
  SN2011fe was detected by the Palomar Transient Factory on August 24th 2011 in
M101 a few hours after the explosion. From the early optical spectra it was
immediately realized that it was a Type Ia supernova thus making this event the
brightest one discovered in the last twenty years. The distance of the event
offered the rare opportunity to perform a detailed observation with the
instruments on board of INTEGRAL to detect the gamma-ray emission expected from
the decay chains of $^{56}$Ni. The observations were performed in two runs, one
before and around the optical maximum, aimed to detect the early emission from
the decay of $^{56}$Ni and another after this maximum aimed to detect the
emission of $^{56}$Co. The observations performed with the instruments on board
of INTEGRAL (SPI, IBIS/ISGRI, JEMX and OMC) have been analyzed and compared
with the existing models of gamma-ray emission from such kind of supernovae. In
this paper, the analysis of the gamma-ray emission has been restricted to the
first epoch. Both, SPI and IBIS/ISGRI, only provide upper-limits to the
expected emission due to the decay of $^{56}$Ni. These upper-limits on the
gamma-ray flux are of 7.1 $\times$ 10$^{-5}$ ph/s/cm$^2$ for the 158 keV line
and of 2.3 $\times$ 10$^{-4}$ ph/s/cm$^2$ for the 812 keV line. These bounds
allow to reject at the $2\sigma$ level explosions involving a massive white
dwarf, $\sim 1$ M$\odot$ in the sub--Chandrasekhar scenario and specifically
all models that would have substantial amounts of radioactive $^{56}$Ni in the
outer layers of the exploding star responsible of the SN2011fe event. The
optical light curve obtained with the OMC camera also suggests that SN2011fe
was the outcome of the explosion, possibly a delayed detonation although other
models are possible, of a CO white dwarf that synthesized $\sim 0.55$ M$_\odot$
of $^{56}$Ni. For this specific model.


title:
Detection of plasma fluctuations in white-light images of the outer
  solar corona: investigation of the spatial and temporal evolution

abstract:
  This work focus on the first results on the identification and
characterization of periodic plasma density fluctuations in the outer corona,
observed in STEREO-A COR1 white-light image time series. A 2D reconstruction of
the spatial distribution and temporal evolution of the coronal fluctuation
power has been performed over the whole plane of the sky, from 1.4 to 4.0 solar
radii. The adopted diagnostic tool is based on wavelet transforms. This
technique, with respect to the standard Fourier analysis, has the advantage of
localizing non-persistent fluctuating features and exploring the variations of
the relating wavelet power in both space and time. The map of the variance of
the coronal brightness clearly outlines intermittent, spatially coherent
fluctuating features, localized along, or adjacent to, the strongest magnetic
field lines. In most cases they do not correspond to the coronal structures
visible in the brightness maps. The results obtained provide a scenario in
which the solar corona shows quasi-periodic, non-stationary density variations
characterized by a wide range of temporal and spatial scales and strongly
confined by the magnetic field topology. In addition, structures fluctuating
with larger power are larger in size and evolve more slowly. The characteristic
periodicities of the fluctuations are comparable to their lifetimes. This
suggests either that plasma fluctuations lasting only one or two wave periods
and initially characterized by a single dominant periodicity, rapidly decay
into a turbulent mixed flow via nonlinear interactions with other plasma modes,
or that they are damped by thermal conduction. [...]


title: Entropy-Driven Phase Transitions of Entanglement

abstract:
  We study the behavior of bipartite entanglement at fixed von Neumann entropy.
We look at the distribution of the entanglement spectrum, that is the
eigenvalues of the reduced density matrix of a quantum system in a pure state.
We report the presence of two continuous phase transitions, characterized by
different entanglement spectra, which are deformations of classical eigenvalue
distributions.


title: A Matlab toolbox for fractional relaxation-oscillation equations

abstract:
  Stress relaxation and oscillation damping of complex viscoelastic media often
manifest history- and path-dependent physical behaviors and cannot accurately
be described by the classical models. Recent research found that fractional
derivative models can characterize such complex relaxation and damping.
However, to our best knowledge, easy-to-use numerical software is not available
for fractional relaxation-oscillation (FRO) equations. This paper is to
introduce an open source free Matlab toolbox which we developed in recent years
for numerical solution of the FRO equations. This FRO toolbox uses the
predictor-corrector approach for the discretization of time fractional
derivative, and non-expert users can accurately solve fractional
relaxation-oscillation equations via a friendly graphical user interface.
Compared with experimental data, our numerical experiments show that the FRO
toolbox is highly efficient and accurate to simulate viscoelastic stress
relaxation and damped vibration. This free toolbox will help promote the
research and practical use of fractional relaxation-oscillation equations.


title: Robust analysis of preferential attachment models with fitness

abstract:
  The preferential attachment network with fitness is a dynamic random graph
model. New vertices are introduced consecutively and a new vertex is attached
to an old vertex with probability proportional to the degree of the old one
multiplied by a random fitness. We concentrate on the typical behaviour of the
graph by calculating the fitness distribution of a vertex chosen proportional
to its degree. For a particular variant of the model, this analysis was first
carried out by Borgs, Chayes, Daskalakis and Roch. However, we present a new
method, which is robust in the sense that it does not depend on the exact
specification of the attachment law. In particular, we show that a peculiar
phenomenon, referred to as Bose-Einstein condensation, can be observed in a
wide variety of models. Finally, we also compute the joint degree and fitness
distribution of a uniformly chosen vertex.