title:
Electronic transmission through AB-BA domain boundary in bilayer
  graphene

abstract:
  We study the electron transmission through the domain boundary on bilayer
graphene separating AB and BA stacking regions. Using the effective continuum
model, we calculate the electron transmission probability as a function of the
electron energy and the incident angle, for several specific boundary
structures. The transmission strongly depends on the crystallographic direction
of the boundary and also on the atomic configuration inside. At the low energy,
the boundary is either insulating or highly transparent depending on the
structure. In insulating cases, the transmission sharply rises when the Fermi
energy is increased to a certain level, suggesting that the electric current
through the boundary can be controlled by the field effect. The boundary
parallel to the zigzag direction generally have different transmission
properties between the two different valleys, and this enables to generate the
valley polarized current in a certain configuration. We show that those
characteristic features can be qualitatively explained by the transverse
momentum conservation in the position-dependent band structure in the
intermediate region.


title: Low-temperature phase diagram of Fe1+yTe

abstract:
  We used low-temperature synchrotron x-ray diffraction to investigate the
structural phase transitions of Fe1+yTe in the vicinity of a tricitical point
in the phase diagram. Detailed analysis of the powder diffraction patterns and
temperature dependence of the peak-widths in Fe1+yTe showed that two-step
structural and magnetic phase transitions occur within the compositional range
0.11 $\leq y \leq $ 0.13. The phase transitions are sluggish indicating a
strong competition between the orthorhombic and the monoclinic phases. We
combine high-resolution diffraction experiments with specific heat,
resistivity, and magnetization measurements and present a revised
temperature-composition phase diagram for Fe1+yTe.


title: Asymptotic symmetry groups and operator algebras

abstract:
  We associate vertex operators to space-time diffeomorphisms in flat space
string theory, and compute their algebra, which is a diffeomorphism algebra
with higher derivative corrections. As an application, we realize the
asymptotic symmetry group BMS3 of three-dimensional flat space in terms of
vertex operators on the string worldsheet. This provides an embedding of the
BMS3 algebra in a consistent theory of quantum gravity. Higher derivative
corrections vanish asymptotically. An appendix is dedicated to alpha prime
corrected algebras in conformal field theory and string theory.


title:
Revisiting the spread spectrum effect in radio interferometric imaging:
  a sparse variant of the w-projection algorithm

abstract:
  Next-generation radio interferometric telescopes will exhibit non-coplanar
baseline configurations and wide field-of-views, inducing a w-modulation of the
sky image, which in turn induces the spread spectrum effect. We revisit the
impact of this effect on imaging quality and study a new algorithmic strategy
to deal with the associated operator in the image reconstruction process. In
previous studies it has been shown that image recovery in the framework of
compressed sensing is improved due to the spread spectrum effect, where the
w-modulation can act to increase the incoherence between measurement and
sparsifying signal representations. For the purpose of computational
efficiency, idealised experiments were performed, where only a constant
baseline component w in the pointing direction of the telescope was considered.
We extend this analysis to the more realistic setting where the w-component
varies for each visibility measurement. Firstly, incorporating varying
w-components into imaging algorithms is a computational demanding task. We
propose a variant of the w-projection algorithm for this purpose, which is
based on an adaptive sparsification procedure, and incorporate it in compressed
sensing imaging methods. This sparse matrix variant of the w-projection
algorithm is generic and adapts to the support of each kernel. Consequently, it
is applicable for all types of direction-dependent effects. Secondly, we show
that for w-modulation with varying w-components, reconstruction quality is
significantly improved compared to the setting where there is no w-modulation
(i.e. w=0), reaching levels comparable to the quality of a constant, maximal
w-component. This finding confirms that one may seek to optimise future
telescope configurations to promote large w-components, thus enhancing the
spread spectrum effect and consequently the fidelity of image reconstruction.


title: Dynamics of Self-retracting motion of graphite micro-flakes

abstract:
  A sheared microscopic graphite mesa retracts spontaneously to minimize
interfacial energy. Using an optical knife-edge technique, we report
comparative measurements of the speeds of such self-retracting motion (SRM) in
air and low vacuum (about 1 Pa). We found that the retracting speed Vm of SRM
is almost the same in the two environments at both room temperature and high
temperature (above 150 celsius degree). We also extract the acceleration of the
SRM, and found some typical behaviors. In the high speed range (above 5 m/s),
the acceleration decreases linearly with the logarithm of the SRM speed. We
attribute this phenomenon to the thermally activated sliding process in SRM. In
the low speed region (between 0.1 m/s and 1 m/s), the acceleration increases
linearly with the logarithm of the SRM speed.


title: Active polar fluid flow in finite droplets

abstract:
  We present a continuum level analytical model of a droplet of active
contractile fluid consisting of filaments and motors. We calculate the steady
state flows that result from a splayed polarisation of the filaments. We
account for the interaction with an arbitrary external medium by imposing a
viscous friction at the fixed droplet boundary. We then show that the droplet
has non-zero force dipole and quadrupole moments, the latter of which is
essential for self-propelled motion of the droplet at low Reynolds' number.
Therefore, this calculation describes a simple mechanism for the motility of a
droplet of active contractile fluid embedded in a 3D environment, which is
relevant to cell migration in confinement (for example, embedded within a gel
or tissue). Our analytical results predict how the system depends on various
parameters such as the effective friction coefficient, the phenomenological
activity parameter and the splay of the imposed polarisation.


title: Opposite translocation of long and short oligomers through a nanopore

abstract:
  We consider elongated cylindrical particles, modeling e.g. DNA fragments or
nano-rods, while translocating under the action of an externally applied
voltage through a solid state nanopore. Particular emphasis is put on the
concomitant potential energy landscape, encountered by the particle on its
passage through the pore due to the complex interplay of various
electrohydrodynamic effects beyond the realm of small Debye lengths. We find
that the net potential energy difference across the membrane may be of opposite
sign for short and long particles of equal diameters and charge densities (e.g.
oligomers). Thermal noise thus leads to biased diffusion through the pore into
opposite directions. By means of an additional membrane gate electrode it is
even possible to control the specific particle length at which this transport
inversion occurs.


title:
On the numerical simulation of Kerr frequency combs using coupled mode
  equations

abstract:
  It is demonstrated that Kerr frequency comb generation described by coupled
mode equations can be numerically simulated using Fast Fourier Transform
methods. This allows broadband frequency combs spanning a full octave to be
efficiently simulated using standard algorithms, resulting in orders of
magnitude improvements in the computation time.


title: Dilute ferromagnetic semiconductors: Physics and spintronic structures

abstract:
  This review compiles results of experimental and theoretical studies on thin
films and quantum structures of semiconductors with randomly distributed Mn
ions, which exhibit spintronic functionalities associated with collective
ferromagnetic spin ordering. Properties of p-type Mn-containing III-V as well
as II-VI, V_2-VI_3, IV-VI, I-II-V, and elemental group IV semiconductors are
described paying particular attention to the most thoroughly investigated
system (Ga,Mn)As that supports the hole-mediated ferromagnetic order up to 190
K for the net concentration of Mn spins below 10%. Multilayer structures
showing efficient spin injection and spin-related magnetotransport properties
as well as enabling magnetization manipulation by strain, light, electric
fields, and spin currents are presented together with their impact on metal
spintronics. The challenging interplay between magnetic and electronic
properties in topologically trivial and non-trivial systems is described,
emphasizing the entangled roles of disorder and correlation at the carrier
localization boundary. Finally, the case of dilute magnetic insulators is
considered, such as (Ga,Mn)N, where low temperature spin ordering is driven by
short-ranged superexchange that is ferromagnetic for certain charge states of
magnetic impurities.


title: Characteristic times of biased random walks on complex networks

abstract:
  We consider degree-biased random walkers whose probability to move from a
node to one of its neighbors of degree $k$ is proportional to $k^{\alpha}$,
where $\alpha$ is a tuning parameter. We study both numerically and
analytically three types of characteristic times, namely: i) the time the
walker needs to come back to the starting node, ii) the time it takes to visit
a given node for the first time, and iii) the time it takes to visit all the
nodes of the network. We consider a large data set of real-world networks and
we show that the value of $\alpha$ which minimizes the three characteristic
times is different from the value $\alpha_{\rm min}=-1$ analytically found for
uncorrelated networks in the mean-field approximation. In addition to this, we
found that assortative networks have preferentially a value of $\alpha_{\rm
min}$ in the range $[-1,-0.5]$, while disassortative networks have $\alpha_{\rm
min}$ in the range $[-0.5, 0]$. We derive an analytical relation between the
degree correlation exponent $\nu$ and the optimal bias value $\alpha_{\rm
min}$, which works well for real-world assortative networks. When only local
information is available, degree-biased random walks can guarantee smaller
characteristic times than the classical unbiased random walks, by means of an
appropriate tuning of the motion bias.


title:
Local Cohomology of Bigraded Rees Algebras and Normal Hilbert
  Coefficients

abstract:
  Let $(R,\m)$ be an analytically unramified Cohen-Macaulay local ring of
dimension 2 with infinite residue field and $\ov{I}$ be the integral closure of
an ideal $I$ in $R$. Necessary and sufficient conditions are given for
$\ov{I^{r+1}J^{s+1}}=a\ov{I^rJ^{s+1}}+b\ov{I^{r+1}J^s}$ to hold ${for all}r
\geq r_0{and}s \geq s_0$ in terms of vanishing of
$[H^2_{(at_1,bt_2)}(\ov{\mathcal{R}^\prime}(I,J))]_{(r_0,s_0)}$, where $a \in
I,b \in J$ is a good joint reduction of the filtration $\{\ov{I^rJ^s}\}.$ This
is used to derive a theorem due to Rees on normal joint reduction number zero.
The vanishing of $\ov{e}_2(IJ)$ is shown to be equivalent to Cohen-Macaulayness
of $\ov{\mathcal{R}}(I,J)$.


title: Angular and Linear Momentum of Excited Ferromagnets

abstract:
  The angular momentum vector of a Heisenberg ferromagnet with isotropic
exchange interaction is conserved, while under uniaxial crystalline anisotropy
the projection of the total spin along the easy axis is a constant of motion.
Using Noether's theorem, we prove that these conservation laws persist in the
presence of dipole-dipole interactions. However, spin and orbital angular
momentum are not conserved separately. We also define the linear momentum of
ferromagnetic textures. We illustrate the general principles with special
reference to the spin transfer torques and identify the emergence of a
non-adiabatic effective field acting on domain walls in ferromagnetic
insulators.


title: Approximating Mills ratio

abstract:
  Consider the Mills ratio $f(x)=\big(1-\Phi(x)\big)/\phi(x), \, x\ge 0$, where
$\phi$ is the density function of the standard Gaussian law and $\Phi$ its
cumulative distribution.We introduce a general procedure to approximate $f$ on
the whole $[0,\infty)$ which allows to prove interesting properties where $f$
is involved. As applications we present a new proof that $1/f$ is strictly
convex, and we give new sharp bounds of $f$ involving rational functions,
functions with square roots or exponential terms. Also Chernoff type bounds for
the Gaussian $Q$--function are studied.


title:
Forecasts of Cancer and Chronic Patients: Big Data Metrics of Population
  Health

abstract:
  Chronic diseases and cancer account for over 75 percent of healthcare costs
in the US. Increased prevention services and improved primary care are thought
to decrease costs. Current models for detecting changes in the health of
populations are cumbersome and expensive, and are not sensitive in the short
term. In this paper we model population health as a dynamical system to predict
the time evolution of the new diagnosis of chronic diseases and cancer. This
provides a reliable forecasting tool and a means of measuring short-term
changes in the health status of the population resulting from preventive care
programs. Twelve month forecasts of cancer and chronic populations were
accurate with errors lying between 3 percent and 6 percent. We confirmed what
other studies have demonstrated that diabetes patients are at increased cancer
risk but, interestingly, we also discovered that all of the studied chronic
conditions increased cancer risk just as diabetes did, and by a similar amount.
The model(i)yields a new metric for measuring performance of preventive and
clinical care programs that can provide timely feedback for quality improvement
programs;(ii)helps understand "savings" in the context of preventive care
programs and explains how they can be calculated in the short term, even though
they materialize only in the long term and(iii)provides an analytic tool and
metrics to infer correlations and derive insights on the effect of changes in
socio-economic factors affecting population health on improving health and
lowering costs of populations.


title: On Nicod's Condition, Rules of Induction and the Raven Paradox

abstract:
  Philosophers writing about the ravens paradox often note that Nicod's
Condition (NC) holds given some set of background information, and fails to
hold against others, but rarely go any further. That is, it is usually not
explored which background information makes NC true or false. The present paper
aims to fill this gap. For us, "(objective) background knowledge" is restricted
to information that can be expressed as probability events. Any other
configuration is regarded as being subjective and a property of the a priori
probability distribution. We study NC in two specific settings. In the first
case, a complete description of some individuals is known, e.g. one knows of
each of a group of individuals whether they are black and whether they are
ravens. In the second case, the number of individuals having a particular
property is given, e.g. one knows how many ravens or how many black things
there are (in the relevant population). While some of the most famous answers
to the paradox are measure-dependent, our discussion is not restricted to any
particular probability measure. Our most interesting result is that in the
second setting, NC violates a simple kind of inductive inference (namely
projectability). Since relative to NC, this latter rule is more closely related
to, and more directly justified by our intuitive notion of inductive reasoning,
this tension makes a case against the plausibility of NC. In the end, we
suggest that the informal representation of NC may seem to be intuitively
plausible because it can easily be mistaken for reasoning by analogy.


title:
Quantum XY criticality in a two-dimensional Bose gas near the Mott
  transition

abstract:
  We derive the equation of state of a two-dimensional Bose gas in an optical
lattice in the framework of the Bose-Hubbard model. We focus on the vicinity of
the multicritical points where the quantum phase transition between the Mott
insulator and the superfluid phase occurs at fixed density and belongs to the
three-dimensional XY model universality class. Using a nonperturbative
renormalization-group approach, we compute the pressure $P(\mu,T)$ as a
function of chemical potential and temperature. Our results compare favorably
with a calculation based on the quantum O(2) model -- we find the same
universal scaling function -- and allow us to determine the region of the phase
diagram in the vicinity of a quantum multicritical point where the equation of
state is universal. We also discuss the possible experimental observation of
quantum XY criticality in a ultracold gas in an optical lattice.


title: Covering dimension using toric varieties

abstract:
  In this paper we deduce the Lebesgue and the
Knaster--Kuratowski--Mazurkiewicz theorems on the covering dimension, as well
as their certain generalizations, from some simple facts of toric geometry.
This provides a new point of view on this circle of results.


title: Interaction quenches in the two-dimensional fermionic Hubbard model

abstract:
  The generic non-equilibrium evolution of a strongly interacting fermionic
system is studied. For strong quenches, a collective collapse-and-revival
phenomenon is found extending over the whole Brillouin zone. A qualitatively
distinct behavior occurs for weak quenches where only weak wiggling occurs.
Surprisingly, no evidence for prethermalization is found in the weak coupling
regime. In both regimes, indications for relaxation beyond oscillatory or power
law behavior are found and used to estimate relaxation rates without resorting
to a probabilistic ansatz. The relaxation appears to be fastest for
intermediate values of the quenched interaction.


title: Speedy Object Detection based on Shape

abstract:
  This study is a part of design of an audio system for in-house object
detection system for visually impaired, low vision personnel by birth or by an
accident or due to old age. The input of the system will be scene and output as
audio. Alert facility is provided based on severity levels of the objects
(snake, broke glass etc) and also during difficulties. The study proposed
techniques to provide speedy detection of objects based on shapes and its
scale. Features are extraction to have minimum spaces using dynamic scaling.
From a scene, clusters of objects are formed based on the scale and shape.
Searching is performed among the clusters initially based on the shape, scale,
mean cluster value and index of object(s). The minimum operation to detect the
possible shape of the object is performed. In case the object does not have a
likely matching shape, scale etc, then the several operations required for an
object detection will not perform; instead, it will declared as a new object.
In such way, this study finds a speedy way of detecting objects.


title: On Anisotropy in Expansion of Magnetic Flux Tubes in the Solar Corona

abstract:
  Most 1d hydrodynamic models of plasma confined to magnetic flux tubes assume
circular cross-section of these tubes. We use potential field models to show
that flux tubes in circumstances relevant to the solar corona do not in general
maintain the same cross-sectional shape through their length and therefore the
assumption of a circular cross-section is rarely true. We support our
hypothesis with mathematical reasoning and numeric experiments. We demonstrate
that lifting this assumption in realistic non-circular loops make apparent
expansion of magnetic flux tubes consistent with that of observed coronal
loops. We propose that in a bundle of ribbon-like loops those that are viewed
along the wide direction would stand out against those that are viewed across
the wide direction, due to the difference in their column depths. That would
impose a bias towards selecting loops that appear not to be expanding seen
projected in the plane of sky. An implication of this selection bias is that
the preferentially selected non-circular loops would appear to have increased
pressure scale height even if they are resolved by current instruments.


title:
On Lloyd's "The Mass Distribution of Subgiant Planet Hosts"
  (arXiv:1306.6627v1)

abstract:
  We provide an informal response to James P. Lloyd's recent arXiv preprint
(arXiv:1306.6627v1) "The Mass Distribution of Subgiant Planet Hosts", accepted
for publication by Astrophysical Journal Letters.


title:
Study of the production of charged pions, kaons, and protons in pPb
  collisions at sqrt(sNN) = 5.02 TeV

abstract:
  Spectra of identified charged hadrons are measured in pPb collisions with the
CMS detector at the LHC at sqrt(sNN) = 5.02 TeV. Charged pions, kaons, and
protons in the transverse-momentum range pt approximately 0.1-1.7 GeV and
laboratory rapidity abs(y) < 1 are identified via their energy loss in the
silicon tracker. The average pt increases with particle mass and the charged
multiplicity of the event. The increase of the average pt with charged
multiplicity is greater for heavier hadrons. Comparisons to Monte Carlo event
generators reveal that EPOS LHC, which incorporates additional hydrodynamic
evolution of the created system, is able to reproduce most of the data
features, unlike HIJING and AMPT. The pt spectra and integrated yields are also
compared to those measured in pp and PbPb collisions at various energies. The
average transverse momentum and particle ratio measurements indicate that
particle production at LHC energies is strongly correlated with event particle
multiplicity.


title:
From Few to Many: Observing the Formation of a Fermi Sea One Atom at a
  Time

abstract:
  Knowing when a physical system has reached sufficient size for its
macroscopic properties to be well described by many-body theory is difficult.
We investigate the crossover from few to many-body physics by studying quasi
one-dimensional systems of ultracold atoms consisting of a single impurity
interacting with an increasing number of identical fermions. We measure the
interaction energy of such a system as a function of the number of majority
atoms for different strengths of the interparticle interaction. As we increase
the number of majority atoms one by one we observe the fast convergence of the
normalized interaction energy towards a many-body limit calculated for a single
impurity immersed in a Fermi sea of majority particles.


title: Non-Stationary Measurements of Chiral Magnetic Effect

abstract:
  We discuss Chiral Magnetic Effect from quantum theory of measurements point
of view for non-stationary measurements. The effect of anisotropy for
fluctuations of electric currents in magnetic field is addressed. It is shown
that anisotropy caused by nonzero axial chemical potential is indistinguishable
in this framework from anisotropy caused by finite measurement time or finite
lifetime of the magnetic field, and in all cases it is related to abelian
triangle anomaly. Possible P-odd effects for central heavy ions collisions
(where Chiral Magnetic Effect is absent) are discussed in this context.


title:
Digital holographic microscopy for the evaluation of human sperm
  structure

abstract:
  The morphology of the sperm head has often been correlated with the outcome
of in vitro fertilization (IVF), and has been shown to be the sole parameter in
semen of value in predicting the success of intracytoplasmic sperm injection
(ICSI) and intracytoplasmic morphologically selected sperm injection (IMSI). In
this paper, we have studied whether Digital Holographic (DH) microscopy may be
useful to obtain quantitative data on human sperm head structure and compared
this technique to high power digitally enhanced Nomarski microscope. The main
advantage of DH is that a high resolution 3-D quantitative sample imaging may
be obtained thorugh numerical refocusing at different object planes without any
mechanical scanning. We show that DH can furnish useful information on the
dimensions and structure of human spermatozoo, that cannot be revealed by
conventional phase contrast microscopy. In fact, in this paper DH has been used
to evaluate volume and indicate precise location of vacuoles, thus suggesting
its use as an additional useful prognostic quantitative tool in assisted
reproduction technology (ART).


title:
Plasmodium falciparum Hsp70-x: A Heat Shock Protein at the Host -
  Parasite Interface

abstract:
  Plasmodium falciparum 70 kDa heat shock proteins (PfHsp70s) are expressed at
all stages of the pathogenic erythrocytic phase of the malaria parasite
lifecycle. There are six PfHsp70s, all of which have orthologues in other
plasmodial species, except for PfHsp70-x which is unique to P. falciparum. This
paper highlights a number of original results obtained by a detailed
bioinformatics analysis of the protein. Large scale sequence analysis indicated
the presence of an extended transit peptide sequence of PfHsp70-x which
potentially directs it to the endoplasmic reticulum (ER). Further analysis
showed that PfHsp70-x does not have an ER-retention sequence, suggesting that
the protein transits through the ER and is secreted into the parasitophorous
vacuole (PV) or beyond into the erythrocyte cytosol. These results are
consistent with experimental findings. Next, possible interactions between
PfHsp70-x and exported P. falciparum Hsp40s or host erythrocyte DnaJs were
interrogated by modeling and docking. Docking results indicated that
interaction between PfHsp70-x and each of the Hsp40s, regardless of biological
feasibility, seems equally likely. This suggests that J domain might not
provide the specificity in the formation of unique Hsp70-Hsp40 complexes, but
that the specificity might be provided by other domains of Hsp40s. By studying
different structural conformations of PfHsp70-x, it was shown that Hsp40s can
only bind when PfHsp70-x is in a certain conformation. Additionally, this work
highlighted the possible dependence of the substrate binding domain residues on
the orientation of the {\alpha}-helical lid for formation of the substrate
binding pocket.


title: Intergalactic magnetic fields in Stephan's Quintet

abstract:
  We present results of the VLA radio continuum total power and polarised
intensity observations of Stephan's Quintet at 1.43 and 4.86 GHz along with
complementary 4.85 and 8.35 GHz Effelsberg observations. Our study shows a
large envelope of radio emission encompassing all the member galaxies and hence
a large volume of intergalac- tic matter. Infall of the galaxy NGC 7318B
produces a ridge of intergalactic, polarised emission, for which the magnetic
field strength was estimated as 11.0 \pm 2.2 {\mu}G, with an ordered component
of 2.6 \pm 0.8 {\mu}G. The energy density of the field within the ridge area is
of the same order as estimates of the thermal component, implying a significant
role of the magnetic field in the dynamics of the intergalactic matter. We also
report that the tidal dwarf galaxy candidate SQ-B possesses a strong and highly
anisotropic magnetic field with the total strength being equal to 6.5 \pm 1.9
{\mu}G and an ordered component reaching 3.5 \pm 1.2 {\mu}G, which is
comparable to that found in normal-sized galaxies.


title: Evaluating a healthcare data warehouse for cancer diseases

abstract:
  This paper presents the evaluation of the architecture of healthcare data
warehouse specific to cancer diseases. This data warehouse containing relevant
cancer medical information and patient data. The data warehouse provides the
source for all current and historical health data to help executive manager and
doctors to improve the decision making process for cancer patients. The
evaluation model based on Bill Inmon's definition of data warehouse is proposed
to evaluate the Cancer data warehouse.


title: Twisted cotangent sheaves and a Kobayashi-Ochiai theorem for foliations

abstract:
  Let X be a normal projective variety, and let A be an ample Cartier divisor
on X. We prove that the twisted cotangent sheaf $\Omega_X \otimes A$ is
generically nef with respect to the polarisation A unless X is a projective
space. As an application we prove a Kobayashi-Ochiai theorem for foliations: if
$F \subsetneq T_X$ is a foliation of rank r such that $det F \equiv i_F A$,
then we have $i_F \leq r$.


title:
Detection prospects for short time-scale transient events at VHE with
  current and next generation Cherenkov observatories

abstract:
  In the current view of Gamma-Ray Burst (GRB) phenomena, an emission component
extending up to the very-high energy (VHE, E > 30 GeV) domain is though to be a
relatively common feature at least in the brightest events. This leads to an
unexpected richness of possible theoretical models able to describe such
phenomenology. Hints of emission at tens of GeV are indeed known since the
EGRET observations during the '90s and confirmed in the Fermi-LAT data.
However, our comprehension of these phenomena is still far to be satisfactory.
In this respect, the VHE characterization of GRBs may constitute a breakthrough
for understanding their physics and, possibly, for providing decisive clues for
the discrimination among different proposed emission mechanisms, which are
barely distinguishable at lower energies. The current generation of Cherenkov
observatories, such as the MAGIC telescopes, have opened the possibility to
extend the measurement of GRB emission, and in general to any short time-scale
transient phenomena, fromfew tens of GeV up to the TeV energy range, with a
higher sensitivity with respect to gamma-ray space-based instruments. In the
near future, a crucial role for the VHE observations of GRBs will be played by
the Cherenkov Telescope Array (CTA), thanks to its about one order of magnitude
better sensitivity and lower energy threshold with respect to current
instruments. In this contribution, we present a method aimed at providing VHE
detection prospects for observations of GRB-like transient events with
Cherenkov telescopes. In particular, we consider the observation of the
transient event GRB 090102 as a test case for the method and show the achieved
detection prospects under different observational conditions for the MAGIC
telescopes and CTA.


title: A tight Gaussian bound for weighted sums of Rademacher random variables

abstract:
  Let $\varepsilon_1,\ldots,\varepsilon_n$ be independent identically
distributed Rademacher random variables, that is
$\mathbb{P}\{\varepsilon_i=\pm1\}=1/2$. Let
$S_n=a_1\varepsilon_1+\cdots+a_n\varepsilon_n$, where
$\mathbf{a}=(a_1,\ldots,a_n)\in\mathbb{R}^n$ is a vector such that
${a_1^2+\cdots+a_n^2\leq1}$. We find the smallest possible constant $c$ in the
inequality \[\mathbb{P}\{S_n\geq x\}\leq c\mathbb{P}\{\eta\geq x\}\qquad for
all x\in \mathbb{R},\] where $\eta\sim N(0,1)$ is a standard normal random
variable. This optimal value is equal to
\[c_*=\bigl(4\mathbb{P}\{\eta\geq\sqrt{2}\}\bigr)^ {-1}\approx3.178.\]


title: A Central Laser Facility for the Cherenkov Telescope Array

abstract:
  A Central Laser Facility is a system often used in astroparticle experiments
based on arrays of fluorescence or Cherenkov light detectors. The instrument is
based on a laser source positioned at a certain distance from the array,
emitting fast light pulses in the vertical direction with the aim of
calibrating the array and/or measuring the atmospheric transmission. In view of
the future Cherenkov Telescope Array (CTA), a similar device could provide a
calibration of the whole installation, both relative, i.e. each individual
telescope with respect to the rest of the array, and absolute, with a precision
better than 10%, if certain design requirements are met. Additionally, a
precise monitoring of the sensitivity of each telescope can be made on
time-scales of days to years. During calibration runs of the central laser
facility, all detectors will be pointed towards the same portion of the laser
beam at a given altitude. Simulations of the possible configurations of a
Central Laser Facility for CTA (varying laser energy, pointing height and
distance from the telescopes) have been performed


title: Mode-by-mode fluid dynamics for relativistic heavy ion collisions

abstract:
  We propose to study the fluid dynamic propagation of fluctuations in
relativistic heavy ion collisions differentially with respect to their
azimuthal, radial and longitudinal wavelength. To this end, we introduce a
background-fluctuation splitting and a Bessel-Fourier decomposition of the
fluctuating modes. We demonstrate how the fluid dynamic evolution of realistic
events can be build up from the propagation of individual modes. We describe
the main elements of this mode-by-mode fluid dynamics, and we discuss its use
in the fluid dynamic analysis of heavy ion collisions. As a first illustration,
we quantify to what extent only fluctuations of sufficiently large radial wave
length contribute to harmonic flow coefficients. We find that fluctuations of
short wave length are suppressed not only due to larger dissipative effects,
but also due to a geometrical averaging over the freeze-out hyper surface. In
this way, our study further substantiates the picture that harmonic flow
coefficients give access to a coarse-grained version of the initial conditions
for heavy ion collisions, only.


title: CTEQ nuclear parton distribution functions

abstract:
  We show for the first time preliminary results of nuclear parton distribution
function analysis of charged lepton DIS and Drell-Yan data within the CTEQ
framework including error PDFs. We compare our error estimates to estimates of
different nPDF groups.


title:
A comparison theorem for stochastic differential equations under a
  Novikov-type condition

abstract:
  We consider a system of stochastic differential equations driven by a
standard n-dimensional Brownian motion where the drift coefficient satisfies a
Novikov-type condition while the diffusion coefficient is the identity matrix.
We define a vector Z of square integrable stochastic processes with the
following property: if the filtration of the translated Brownian motion
obtained from the Girsanov transform coincides with the one of the driving
noise then Z coincides with the unique strong solution of the equation;
otherwise the process Z solves in the strong sense a related stochastic
differential inequality. This fact together with an additional assumption will
provide a comparison result similar to well known theorems obtained in the
presence of strong solutions.


title:
Probing the temporal and spatial variations of dust emission in the
  protoplanetary disk of DG Tau with VLTI/MIDI - Preliminary results

abstract:
  The signatures of dust processing and grain growth - related to the formation
of rocky planets - are easily seen in mid-infrared spectral features. One
important diagnostic tool in this context is the silicate feature in the
spectra of young stellar objects (YSO). The low-mass YSO, DG Tau shows unique
temporal variations in its silicate feature. We conducted multi-epoch
observations of DG Tau with the MID-Infrared Interferometric instrument of the
Very Large Telescope Interferometer to obtain the spectra of the inner and
outer disk regions in order to investigate where the previously reported
variations of the silicate feature originate from. Here we present the
preliminary results of the first two epochs of observations. We found that on a
time-scale of two months, the source showed significant brightening. At the
same time the mid-infrared emitting region expanded. While the identification
of the silicate feature is difficult, our results qualitatively agree with the
scenario explaining the varying silicate feature with dust lifted up above the
disk.


title: Energy-aware adaptive bi-Lipschitz embeddings

abstract:
  We propose a dimensionality reducing matrix design based on training data
with constraints on its Frobenius norm and number of rows. Our design criteria
is aimed at preserving the distances between the data points in the
dimensionality reduced space as much as possible relative to their distances in
original data space. This approach can be considered as a deterministic
Bi-Lipschitz embedding of the data points. We introduce a scalable learning
algorithm, dubbed AMUSE, and provide a rigorous estimation guarantee by
leveraging game theoretic tools. We also provide a generalization
characterization of our matrix based on our sample data. We use compressive
sensing problems as an example application of our problem, where the Frobenius
norm design constraint translates into the sensing energy.


title: Scrambling in the Black Hole Portrait

abstract:
  Recently a quantum portrait of black holes was suggested according to which a
macroscopic black hole is a Bose-Einstein condensate of soft gravitons stuck at
the critical point of a quantum phase transition. We explain why quantum
criticality and instability are the key for efficient generation of
entanglement and consequently of the scrambling of information. By studying a
simple Bose-Einstein prototype, we show that the scrambling time, which is set
by the quantum break time of the system, goes as $\log N \,$ for $N$ the number
of quantum constituents or equivalently the black hole entropy.

categories: hep-th cond-mat.quant-gas gr-qc quant-ph


title: A Study of Kummer's Proof of Fermat's Last Theorem for Regular Primes

abstract:
  We study Kummer's approach towards proving the Fermat's last Theorem for
regular primes. Some basic algebraic prerequisites are also discussed in this
report, and also a brief history of the problem is mentioned. We review among
other things the Class number formula, and use this formula to conclude our
study.


title:
The Jain-Monrad criterion for rough paths and applications to random
  Fourier series and non-Markovian H\"ormander theory

abstract:
  We discuss stochastic calculus for large classes of Gaussian processes, based
on rough path analysis. Our key condition is a covariance measure structure
combined with a classical criterion due to Jain and Monrad [Ann. Probab. 11
(1983) 46-57]. This condition is verified in many examples, even in absence of
explicit expressions for the covariance or Volterra kernels. Of special
interest are random Fourier series, with covariance given as Fourier series
itself, and we formulate conditions directly in terms of the Fourier
coefficients. We also establish convergence and rates of convergence in rough
path metrics of approximations to such random Fourier series. An application to
SPDE is given. Our criterion also leads to an embedding result for
Cameron-Martin paths and complementary Young regularity (CYR) of the
Cameron-Martin space and Gaussian sample paths. CYR is known to imply Malliavin
regularity and also It\^o-like probabilistic estimates for stochastic integrals
(resp., stochastic differential equations) despite their (rough) pathwise
construction. At last, we give an application in the context of non-Markovian
H\"ormander theory.


title: Trace formula for activated escape in noisy maps

abstract:
  Using path-integral methods, a formula is deduced for the noise-induced
escape rate from an attracting fixed point across an unstable fixed point in
one-dimensional maps. The calculation starts from the trace formula for the
eigenvalues of the Frobenius-Perron operator ruling the time evolution of the
probability density in noisy maps. The escape rate is determined from the loop
formed by two heteroclinic orbits connecting back and forth the two fixed
points of the one-dimensional map extended to a two-dimensional symplectic map.
The escape rate is obtained with the expression of the prefactor to
Arrhenius-van't Hoff exponential factor.


title: Preserving closedness of operators under summation

abstract:
  We give a sufficient condition for the sum of two closed operators to be
closed. In particular, we study the sum of two sectorial operators with the sum
of their sectoriality angles greater than $\pi$. We show that if one of the
operators admits bounded $H^{\infty}$-calculus and the resolvent of the other
operator satisfies a boundedness condition stronger than the standard
sectoriality, but weaker than the bounded imaginary powers property in the case
of UMD spaces, then the sum is closed. We apply the result to the abstract
parabolic problem and give a sufficient condition for $L^{p}$-maximal
regularity.


title: Non-Elitist Genetic Algorithm as a Local Search Method

abstract:
  Sufficient conditions are found under which the iterated non-elitist genetic
algorithm with tournament selection first visits a local optimum in
polynomially bounded time on average. It is shown that these conditions are
satisfied on a class of problems with guaranteed local optima (GLO) if
appropriate parameters of the algorithm are chosen.


title: Forecasting ability of a multi-renewal seismicity model for Italy

abstract:
  The inter-event time, IET, is sometimes used as a basis for prediction of
large earthquakes. It is the case when theoretical analysis of prediction is
possible. Quite recently a specific IET- model was suggested for dynamic
probabilistic prediction of M > 5.5 events in Italy . In this study we analyze
both some aspects of the statistical estimation of the model and its predictive
ability. We find that more or less effective prediction is possible within 4
out of 34 seismotectonic zones where seismicity rate or clustering of events is
relatively high. We show that, in the framework of the model, one can suggest a
simple zone independent strategy, which practically optimizes the relative
number of nonaccidental successes, or the Hanssen-Kuiper, HK, skill score. This
quasi-optimal strategy declares alarm in a zone for the first 2.67 years just
after the occurrence of each large event in the zone. The optimal HK skill
score values are: 26% for the 3 most active zones and 2-10% for the 26 least
active zones. However, the number of false alarm time intervals per one event
in each of the zones is unusually high: 0.7 and 0.8-0.95 respectively. Both
these theoretical estimations are important because any prospective testing of
the model is unrealistic in most of the zones during a reasonable time. This
particular analysis requires a discussion of the following issues of general
interest: a specific approach to the analysis of predictions vs. the standard
CSEP testing approach; prediction vs. forecasting; HK skill score vs.
probability gain; the total forecast error diagram and connected false alarms.


title: Noise to lubricate qubit transfer in a spin network

abstract:
  We consider quantum state transfer in a fully connected spin network, in
which the results indicate that it is impossible to achieve high fidelity by
free dynamics. However, the addition of certain kinds of noise can be helpful
for this purpose. In fact, we introduce a model of Gaussian white noise
affecting the spin-spin couplings (edges), except those linked to the input and
output node, and prove that it enhances the fidelity of state transfer. The
observed noise benefit is scale free as it applies to a quantum network of any
size. The amount of the fidelity enhancement, depending on the noise strength
as well as on the number of edges to which it is applied, can be so high as to
take the fidelity close to one.


title:
Application of Bogolyubov's approach to the derivation of kinetic
  equations for dissipative systems

abstract:
  The main goal of the present article is to extend the Bogolyubov method for
deriving kinetic equations to dissipative many-body systems. The basic
conjecture underlying the Bogolyubov approach is the functional hypothesis,
according to which, the many-particle distribution functions are assumed to be
functionals of the one-particle distribution function on kinetic time scales.
Another ingredient in the Bogolyubov approach is the principle of the spatial
weakening of correlations, which reflects statistical independence of physical
values at distant spatial points. One can consider it as a reasonable mixing
property of many-particle distribution functions. The motivation behind the
generalization of Bogolyubov's approach to (classical) many-body dissipative
systems is the wish to describe the dynamics of granular systems, in particular
granular fluids. To this end we first define a general dissipative fluid
through a dissipation function, thereby generalizing the commonly employed
models for granular fluids. Using the Bogolyubov functional hypothesis we show
how a reduction of the pertinent BBGKY hierarchy can be achieved. The method is
then employed to cases which can be treated perturbatively, such as those in
which the interactions are weak or the dissipation is small or the particle
density is small. Kinetic descriptions are obtained in all of these limiting
cases. As a test case, we show that the Bogolyubov method begets the now
standard inelastic Boltzmann equation for dilute monodisperse collections of
spheres whose collisions are characterized by a fixed coefficient of normal
restitution. Possible further applications and implications are discussed.


title: Optical detection of radio waves through a nanomechanical transducer

abstract:
  Low-loss transmission and sensitive recovery of weak radio-frequency (rf) and
microwave signals is an ubiquitous technological challenge, crucial in fields
as diverse as radio astronomy, medical imaging, navigation and communication,
including those of quantum states. Efficient upconversion of rf-signals to an
optical carrier would allow transmitting them via optical fibers dramatically
reducing losses, and give access to the mature toolbox of quantum optical
techniques, routinely enabling quantum-limited signal detection. Research in
the field of cavity optomechanics has shown that nanomechanical oscillators can
couple very strongly to either microwave or optical fields. An oscillator
accommodating both functionalities would bear great promise as the intermediate
platform in a radio-to-optical transduction cascade. Here, we demonstrate such
an opto-electro-mechanical transducer utilizing a high-Q nanomembrane. A
moderate voltage bias (<10V) is sufficient to induce strong coupling between
the voltage fluctuations in a rf resonance circuit and the membrane's
displacement, which is simultaneously coupled to light reflected off its
metallized surface. The circuit acts as an antenna; the voltage signals it
induces are detected as an optical phase shift with quantum-limited
sensitivity. The half-wave voltage is in the microvolt range, orders of
magnitude below that of standard optical modulators. The noise added by the
membrane is suppressed by the electro-mechanical cooperativity C~6800 and has a
temperature of 40mK, far below 300K where the entire device is operated. This
corresponds to a sensitivity limit as low as 5 pV/Hz^1/2, or -210dBm/Hz in a
narrow band around 1 MHz. Our work introduces an entirely new approach to
all-optical, ultralow-noise detection of classical electronic signals, and sets
the stage for coherent upconversion of low-frequency quantum signals to the
optical domain.


title: One-way deficit of SU(2) invariant states

abstract:
  We calculate analytically the one-way deficit for systems consisting spin-$j$
and spin-${1}{2}$ subsystems with SU(2) symmetry. Comparing our results with
the quantum discord of SU(2) invariant states, we show that the one-way deficit
is equal to the quantum discord for half-integer $j$, and is larger than the
quantum discord for integer $j$. Moreover, we also compare the one-way deficit
with entanglement of formation. The quantum entanglement tends to zero as $j$
increases, while the one-way deficit can remain significantly large.


title:
Interactions with quadratic dependence on string-localized massive
  vectormesons: massive scalar quantum electrodynamics

abstract:
  Wigner's famous 1939 classification of positive energy representations,
combined with the more recent modular localization principle, has led to a
significant conceptual and computational extension of renormalized perturbation
theory to interactions involving fields of higher spin s>1/2. The starting
observation was that the well-known clash between point-localized gauge
theories and the Hilbert space, which hitherto has been solved by using a Krein
space setting, can also be solved by preserving the Hilbert space setting; in
this case the theory selects the tightest covariant localization which is
consistent with the Hilbert space positivity. The resulting semiinfinite
spacelike string-localization for all (m=0,s>1/2) representations does not only
lead to a new insight into the origin of infrared problems (including
confinement), but also improves the short-distance behavior of massive s>1/2
fields to the extend that the power-counting criterion admits candidates for
renormalizable interactions for arbitrary high spins. In this work the new
situation is exemplified for the interaction of massive vectormesons with
scalar charged- and neutral- (Higgs) matter, for which the new "adiabatic
equivalence principle" leads to a local relation between a renormalizable
stringlike and a nonrenormalizable (but nevertheless finite-parametric)
pointlike interaction.


title:
Excitation of high-amplitude localized nonlinear waves as a result of
  interaction of kink with attractive impurity in sine-Gordon equation

abstract:
  We study properties of the localized solitons to the sine-Gordon equation
excited on the attractive impurity by a moving kink. The cases of one- and
two-dimensional spatially extended impurities are considered. For the case of
one-dimensional impurity the possibility of excitation of the first even and
odd high-amplitude impurity modes by the moving kink is demonstrated. For the
case of two-dimensional impurity we show the possibility of excitation of the
nonlinear high-amplitude waves of new type called here breathing pulson and
breathing 2D soliton. We suggest different analytical expressions to model
these nonlinear excitations. The dependencies of the oscillation frequency and
the amplitude of the excited impurity modes on the impurity parameters are
reported.


title:
Photo luminescence of Cooper pairs in a naturally occurring
  heretostructure K$_{0.75}$Fe$_{1.75}$Se$_{2}$

abstract:
  Combining superconductor and semiconductors in nanostructure junctions was a
challenging technological problem that attracted attention for long time [van
Wees]. The radiative recombination of Cooper pairs was demonstrated, using a
Nb/n-InGaAs/p-InP heterostructure [EL_Hayashi, PL_Hayashi], called Cooper pair
LED [PL_Suemune, R_Suemune]. It has been suggested that the junction could
produce entangled photon pairs [Benson, Gywat] needed for quantum information
processing and communication. Here we demonstrate an enhanced radiative
recombination of electron Copper pairs in inhomogeneous
K$_{0.75}$Fe$_{1.75}$Se$_{2}$ (KFS) subjected to laser light upon cooling below
superconducting transition temperature $T_{c}$ 28 K. The observation of this
phenomena is possible due to fulfillment of the following three conditions: (1)
Phase separation in superconducting KFS crystals is realized via naturally
occurring heterostructure [mic_Charnukha, TEM_Wang]; (2) Partial Fe-vacancy
ordered $n$-type semiconducting regions, sandwiched between Fe-vacancy free SC
and vacancy-ordering AFM structure, forming active layers. The electronic
structure of those active layer is tuned to induce Cooper pairs by the
proximity effect [de Gennes] and/or to accept Cooper pair tunneling from the SC
phase. In the active layer, the electron Cooper pair can radiatively recombine
with two p-type holes [Asano] produced by laser photoexcitation; (3) In KFS
nature provides at least 10$^{9}$ SC/$n$-type semiconducting/AFM insulating
junctions per cm$^{3}$. For laser excitation energy of 1.92 eV ($\lambda
$=647.1 nm) and power 0.68 mW focused to the spot of 40x80 $\mu $m$^{2}$ the
estimated internal quantum efficiency of the natural heterostructure at 10 K in
the luminescence range of 700 to 1300 nm is close to 100% and is likely limited
by availability of the $p$-type holes.


title: A Set of Questions in Combinatorial and Metric Geometry

abstract:
  We briefly introduce several problems: (1) a generalization of the convex
fair partition conjecture, (2) on non-trivial invariants among polyhedrons that
can be formed from the same set of face polygons, (3) two questions on
assembling rectangular tiles to form larger rectangles and (4) on convex
regions which maximize and minimize the diameter for specified area and
perimeter. For each question, we discuss partial solutions and indicate aspects
that to our knowledge, await exploration.


title:
IceCube Search for Dark Matter Annihilation in nearby Galaxies and
  Galaxy Clusters

abstract:
  We present the results of a first search for self-annihilating dark matter in
nearby galaxies and galaxy clusters using a sample of high-energy neutrinos
acquired in 339.8 days of live time during 2009/10 with the IceCube neutrino
observatory in its 59-string configuration. The targets of interest include the
Virgo and Coma galaxy clusters, the Andromeda galaxy, and several dwarf
galaxies. We obtain upper limits on the cross section as a function of the
weakly interacting massive particle mass between 300 GeV and 100 TeV for the
annihilation into b bbar, W+W-, \tau+\tau-, \mu+\mu-, and \nu \nu bar. A limit
derived for the Virgo cluster, when assuming a large effect from subhalos,
challenges the weak interacting massive particle interpretation of a recently
observed GeV positron excess in cosmic rays.


title: Kneading determinants of infinite order linear recurrences

abstract:
  Infinite order linear recurrences are studied via kneading matrices and
kneading determinants. The concepts of kneading matrix and kneading determinant
of an infinite order linear recurrence, introduced in this work, are defined in
a purely linear algebraic context. These concepts extend the classical notions
of Frobenius companion matrix to infinite order linear recurrences and to the
associated discriminant of finite order linear recurrences. Asymptotic Binet
formulas are deduced for general classes of infinite order linear recurrences
as a consequence of the analytical properties of the generating functions
obtained for the solutions of these infinite order linear recurrences.


title:
From infinite to two dimensions through the functional renormalization
  group

abstract:
  We present a novel scheme for an unbiased and non-perturbative treatment of
strongly correlated fermions. The proposed approach combines two of the most
successful many-body methods, i.e., the dynamical mean field theory (DMFT) and
the functional renormalization group (fRG). Physically, this allows for a
systematic inclusion of non-local correlations via the flow equations of the
fRG, after the local correlations are taken into account non-perturbatively by
the DMFT. To demonstrate the feasibility of the approach, we present numerical
results for the two-dimensional Hubbard model at half-filling.


title: Scalar self-force for eccentric orbits around a Schwarzschild black hole

abstract:
  We revisit the problem of computing the self-force on a scalar charge moving
along an eccentric geodesic orbit around a Schwarzschild black hole. This work
extends previous scalar self-force calculations for circular orbits, which were
based on a regular "effective" point-particle source and a full 3D evolution
code. We find good agreement between our results and previous calculations
based on a (1+1) time-domain code. Finally, our data visualization is
unconventional: we plot the self-force through full radial cycles to create
"self-force loops", which reveal many interesting features that are less
apparent in standard presentations of eccentric-orbit self-force data.


title: Nonstandard Vector Space with a Metric and Its Topological Structure

abstract:
  In this paper, we introduce the nonstandard vector space in which the concept
of additive inverse element will not be taken into account. We also consider a
metric defined on this nonstandard vector space. Under these settings, the
conventional intuitive properties for the open and closed balls will not hold
true. Therefore, four kinds of open and closed sets are proposed. Furthermore,
the topologies generated by these different concepts of open and closed sets
are investigated.


title:
The Hamiltonian Path Integrand for the Charged Particle in a Constant
  Magnetic field as White Noise Distribution

abstract:
  The concepts of Hamiltonian Feynman integrals in white noise analysis are
used to realize as the first velocity dependent potential the Hamiltonian
Feynman integrand for a charged particle in a constant magnetic field in
coordinate space as a Hida distribution. For this purpose the velocity
dependent potential gives rise to a generalized Gauss kernel. Besides the
propagators also the generating functionals are obtained.


title:
Attracting fixed points for heavy particles in the vicinity of a vortex
  pair

abstract:
  We study the behaviour of heavy inertial particles in the flow field of two
like-signed vortices. In a frame co-rotating with the two vortices, we find
that stable fixed points exist for these heavy inertial particles; these stable
frame-fixed points exist only for particle Stokes number $St<St_{cr}$. We
estimate $St_{cr}$ and compare this with direct numerical simulations, and find
that the addition of viscosity increases the $St_{cr}$ slightly. We also find
that the fixed points become more stable with increasing $St$ until they
abruptly disappear at $St=St_{cr}$. These frame-fixed points are between fixed
points and limit cycles in character.


title:
On Bounded Positive Stationary Solutions for a Nonlocal Fisher-KPP
  Equation

abstract:
  We study the existence of stationary solutions for a nonlocal version of the
Fisher-Kolmogorov-Petrovskii-Piscounov (FKPP) equation. The main motivation is
a recent study by Berestycki et {al.} [Nonlinearity 22 (2009),
{pp.}~2813--2844] where the nonlocal FKPP equation has been studied and it was
shown for the spatial domain $\mathbb{R}$ andsufficiently small nonlocality
that there are only two bounded non-negative stationary solutions. Here we
provide a similar result for $\mathbb{R}^d$ using a completely different
approach. In particular, an abstract perturbation argument is used in suitable
weighted Sobolev spaces. One aim of the alternative strategy is that it can
eventually be generalized to obtain persistence results for hyperbolic
invariant sets for other nonlocal evolution equations on unbounded domains with
small nonlocality, {i.e.}, to improve our understanding in applications when a
small nonlocal influence alters the dynamics and when it does not.


title:
Loci in strata of meromorphic differentials with fully degenerate
  Lyapunov spectrum

abstract:
  We construct explicit closed GL(2, R)-invariant loci in strata of meromorphic
differentials of arbitrary large dimension with fully degenerate Lyapunov
spectrum. This answers a question of Forni-Matheus-Zorich.


title: Adjacency preservers on invertible hermitian matrices I

abstract:
  Hua's fundamental theorem of geometry of hermitian matrices characterizes all
bijective maps on the space of all hermitian matrices, which preserve adjacency
in both directions. In this and subsequent paper we characterize maps on the
set of all invertible hermitian matrices over a finite field, which preserve
adjacency in one direction. This and author's previous result are used to
obtain two new results related to maps that preserve the `speed of light' on
finite Minkowski space-time.
  In this first paper it is shown that maps that preserve adjacency on the set
of all invertible hermitian matrices over a finite field are necessarily
bijective, so the corresponding graph on invertible hermitian matrices, where
edges are defined by the adjacency relation, is a core. Besides matrix theory,
the proof relies on results from several other mathematical areas, including
spectral and chromatic graph theory, and projective geometry.


title: The Effective Field Theory of Inflation Models with Sharp Features

abstract:
  We describe models of single-field inflation with small and sharp step
features in the potential (and sound speed) of the inflaton field, in the
context of the Effective Field Theory of Inflation. This approach allows us to
study the effects of features in the power-spectrum and in the bispectrum of
curvature perturbations, from a model-independent point of view, by
parametrizing the features directly with modified "slow-roll" parameters. We
can obtain a self-consistent power-spectrum, together with enhanced
non-Gaussianity, which grows with a quantity $\beta$ that parametrizes the
sharpness of the step. With this treatment it is straightforward to generalize
and include features in other coefficients of the effective action of the
inflaton field fluctuations. Our conclusion in this case is that, excluding
extrinsic curvature terms, the only interesting effects at the level of the
bispectrum could arise from features in the first slow-roll parameter
$\epsilon$ or in the speed of sound $c_s$. Finally, we derive an upper bound on
the parameter $\beta$ from the consistency of the perturbative expansion of the
action for inflaton perturbations. This constraint can be used for an
estimation of the signal-to-noise ratio, to show that the observable which is
most sensitive to features is the power-spectrum. This conclusion would change
if we consider the contemporary presence of a feature and a speed of sound $c_s
< 1$, as, in such a case, contributions from an oscillating folded
configuration can potentially make the bispectrum the leading observable for
feature models.


title: Adjacency preservers on invertible hermitian matrices II

abstract:
  Maps that preserve adjacency on the set of all invertible hermitian matrices
over a finite field are characterized. It is shown that such maps form a group
that is generated by the maps $A\mapsto PAP^{\ast}$, $A\mapsto A^{\sigma}$, and
$A\mapsto A^{-1}$, where $P$ is an invertible matrix, $P^{\ast}$ is its
conjugate transpose, and $\sigma$ is an automorphism of the underlying field.
Bijectivity of maps is not an assumption but a conclusion. Moreover, adjacency
is assumed to be preserved in one directions only.
  The main result and author's previous result [16] are applied to characterize
maps that preserve the `speed of light' on (a) finite Minkowski space-time and
(b) the complement of the light cone in finite Minkowski space-time.


title:
3- and 4-body Interactions from 2-body interactions in Spin Models: A
  Route to Abelian and Non-Abelian Fractional Chern Insulators

abstract:
  We describe a method for engineering local $k+1$-body interactions
($k=1,2,3$) from two-body couplings in spin-${1}{2}$ systems. When implemented
in certain systems with a flat single-particle band with a unit Chern number,
the resulting many-body ground states are fractional Chern insulators which
exhibit abelian and non-abelian anyon excitations. The most complex of these,
with $k=3$, has Fibonacci anyon excitations; our system is thus capable of
universal topological quantum computation. We then demonstrate that an
appropriately tuned circuit of qubits could faithfully replicate this model up
to small corrections, and further, we describe the process by which one might
create and manipulate non-abelian vortices in these circuits, allowing for
direct control of the system's quantum information content.


title: Superstrong and other large cardinals are never Laver indestructible

abstract:
  Superstrong cardinals are never Laver indestructible. Similarly, almost huge
cardinals, huge cardinals, superhuge cardinals, rank-into-rank cardinals,
extendible cardinals, 1-extendible cardinals, 0-extendible cardinals, weakly
superstrong cardinals, uplifting cardinals, pseudo-uplifting cardinals,
superstrongly unfoldable cardinals, \Sigma_n-reflecting cardinals,
\Sigma_n-correct cardinals and \Sigma_n-extendible cardinals (all for n>2) are
never Laver indestructible. In fact, all these large cardinal properties are
superdestructible: if \kappa\ exhibits any of them, with corresponding target
\theta, then in any forcing extension arising from nontrivial strategically
<\kappa-closed forcing Q in V_\theta, the cardinal \kappa\ will exhibit none of
the large cardinal properties with target \theta\ or larger.


title:
Global attractors for multivalued semiflows with weak continuity
  properties

abstract:
  A method is proposed to deal with some multivalued semiflows with weak
continuity properties. An application to the reaction-diffusion problems with
nonmonotone multivalued semilinear boundary condition and nonmonotone
multivalued semilinear source term is presented.


title: Emittance Measurements of a Superconducting High Frequency Electron Gun

abstract:
  In order to investigate and understand the influence of gun design, cathode
preparation and operational parameters on the beam quality it is important to
have reliable and accurate beam diagnostics available. The focus of this work
was thus to employ the available diagnostic beam line of the current gun
demonstrator to characterize the transverse phase space of the beam and measure
the emittance at various beam settings and operation conditions. Slit mask and
solenoid scanning techniques are applied.


title: Genetic approach for arabic part of speech tagging

abstract:
  With the growing number of textual resources available, the ability to
understand them becomes critical. An essential first step in understanding
these sources is the ability to identify the part of speech in each sentence.
Arabic is a morphologically rich language, wich presents a challenge for part
of speech tagging. In this paper, our goal is to propose, improve and implement
a part of speech tagger based on a genetic alorithm. The accuracy obtained with
this method is comparable to that of other probabilistic approaches.


title:
On-line Bayesian parameter estimation in general non-linear state-space
  models: A tutorial and new results

abstract:
  On-line estimation plays an important role in process control and monitoring.
Obtaining a theoretical solution to the simultaneous state-parameter estimation
problem for non-linear stochastic systems involves solving complex
multi-dimensional integrals that are not amenable to analytical solution. While
basic sequential Monte-Carlo (SMC) or particle filtering (PF) algorithms for
simultaneous estimation exist, it is well recognized that there is a need for
making these on-line algorithms non-degenerate, fast and applicable to
processes with missing measurements. To overcome the deficiencies in
traditional algorithms, this work proposes a Bayesian approach to on-line state
and parameter estimation. Its extension to handle missing data in real-time is
also provided. The simultaneous estimation is performed by filtering an
extended vector of states and parameters using an adaptive
sequential-importance-resampling (SIR) filter with a kernel density estimation
method. The approach uses an on-line optimization algorithm based on
Kullback-Leibler (KL) divergence to allow adaptation of the SIR filter for
combined state-parameter estimation. An optimal tuning rule to control the
width of the kernel and the variance of the artificial noise added to the
parameters is also proposed. The approach is illustrated through numerical
examples.


title:
Random Walks in Rindler Spacetime and String Theory at the Tip of the
  Cigar

abstract:
  In this paper, we discuss Rindler space string thermodynamics from a thermal
scalar point of view as an explicit example of the results obtained in JHEP
1402 (2014) 127. We discuss the critical behavior of the string gas and
interpret this as a random walk near the black hole horizon. Combining field
theory arguments with the random walk path integral picture, we realize (at
genus one) the picture put forward by Susskind of a long string surrounding
black hole horizons. We find that thermodynamics is dominated by a long string
living at string-scale distance from the horizon whose redshifted temperature
is the Rindler or Hawking temperature. We provide further evidence of the
recent proposal for string theory at the tip of the cigar by comparing with the
flat space orbifold approach to Rindler thermodynamics. We discuss all types of
closed strings (bosonic, type II and heterotic strings).


title:
Extremely Correlated Fermi Liquid study of the U=infinity Anderson
  Impurity Model

abstract:
  We apply the recently developed extremely correlated Fermi liquid theory to
the Anderson impurity model, in the extreme correlation limit. We develop an
expansion in a parameter \lambda, related to n_d, the average occupation of the
localized orbital, and find analytic expressions for the Green's functions to
O(\lambda^2). These yield the impurity spectral function and also the
self-energy \Sigma(\omega) in terms of the two self energies of the ECFL
formalism. The imaginary parts of the latter, have roughly symmetric low energy
behaviour (~ \omega^2), as predicted by Fermi Liquid theory. However, the
inferred impurity self energy
  \Sigma"(\omega) develops asymmetric corrections near n_d ~ 1, leading in turn
to a strongly asymmetric impurity spectral function with a skew towards the
occupied states. Within this approximation the Friedel sum rule is satisfied
but we overestimate the quasiparticle weight z relative to the known exact
results, resulting in an over broadening of the Kondo peak. Upon scaling the
frequency by the quasiparticle weight z, the spectrum is found to be in
reasonable agreement with numerical renormalization group results over a wide
range of densities.


title:
IRDIS, the dual-band imager camera of SPHERE: testing the performances
  in laboratory

abstract:
  Next year the second generation instrument SPHERE will begin science
operations at the Very Large Telecope (ESO). This instrument will be dedicated
to the search for exoplanets through the direct imaging techniques, with the
new generation extreme adaptive optics. In this poster, we present the
performances of one of the focal instruments, the Infra-Red Dual-beam Imaging
and Spectroscopy (IRDIS). All the results have been obtained with tests in
laboratory, simulating the observing conditions in Paranal. We tested several
configurations using the sub-system Integral Field Spectrograph (IFS) in
parallel and simulating long coronographic exposures on a star, calibrating
instrumental ghosts, checking the performance of the adaptive optics system and
reducing data with the consortium pipeline. The contrast one can reach with
IRDIS is of the order of 2\times 10^{-6}$ at 0.5 arcsec separation from the
central star.


title:
Singlet-triplet Crossover in the Two-dimensional Dimer Spin System
  YbAl3C3

abstract:
  Low-temperature magnetization (M) measurements down to 0.1 K have been
performed in magnetic fields up to 14.5 T for a single piece of a tiny
single-crystalline sample (0.2 mg weight) of the spin-gap system YbAl3C3. At
the base temperature of 0.1 K, several metamagnetic transitions were clearly
observed for H // c in the range 6 T < H < 9 T whereas only two transitions
were observed, one at 4.8 T and the other at 6.6 T, for H // a. At fields above
9 T, the magnetization becomes almost saturated for both H // a and H // c. The
present results indicate that a singlet-triplet crossover occurs in a
relatively narrow field range, suggesting a rather weak interdimer interaction
in spite of the nearly triangular lattice of Yb ions.


title:
False discovery rate regression: an application to neural synchrony
  detection in primary visual cortex

abstract:
  Many approaches for multiple testing begin with the assumption that all tests
in a given study should be combined into a global false-discovery-rate
analysis. But this may be inappropriate for many of today's large-scale
screening problems, where auxiliary information about each test is often
available, and where a combined analysis can lead to poorly calibrated error
rates within different subsets of the experiment. To address this issue, we
introduce an approach called false-discovery-rate regression that directly uses
this auxiliary information to inform the outcome of each test. The method can
be motivated by a two-groups model in which covariates are allowed to influence
the local false discovery rate, or equivalently, the posterior probability that
a given observation is a signal. This poses many subtle issues at the interface
between inference and computation, and we investigate several variations of the
overall approach. Simulation evidence suggests that: (1) when covariate effects
are present, FDR regression improves power for a fixed false-discovery rate;
and (2) when covariate effects are absent, the method is robust, in the sense
that it does not lead to inflated error rates. We apply the method to neural
recordings from primary visual cortex. The goal is to detect pairs of neurons
that exhibit fine-time-scale interactions, in the sense that they fire together
more often than expected due to chance. Our method detects roughly 50% more
synchronous pairs versus a standard FDR-controlling analysis. The companion R
package FDRreg implements all methods described in the paper.


title:
Attractors for Navier-Stokes flows with multivalued and nonmonotone
  subdifferential boundary conditions

abstract:
  We consider two-dimensional nonstationary Navier-Stokes shear flow with
multivalued and nonmonotone boundary conditions on a part of the boundary of
the flow domain. We prove the existence of global in time solutions of the
considered problem which is governed by a partial differential inclusion with a
multivalued term in the form of Clarke subdifferential. Then we prove the
existence of a trajectory attractor and a weak global attractor for the
associated multivalued semiflow. This research is motivated by control problems
for fluid flows in domains with semipermeable walls and membranes.


title:
Abundance analysis of the Gamma Doradus - Delta Scuti hybrid metallic
  line (Am) star HD 8801

abstract:
  Low frequency oscillation, typical for Gamma Doradus g-mode type stellar core
sensitive pulsation, as well as higher frequency Delta Scuti type pulsation
typical for p-modes, sensitive to the envelope, make HD 8801 a remarkable
hybrid pulsator with the potential to probe a stellar structure over a wide
range of radius. In addition HD 8801 is a rare pulsating metallic line (Am)
star. We determined the astrophysical fundamental parameters to locate HD 8801
in the HR diagram. We analyzed the element abundances, paying close attention
to the errors involved, and confirm the nature of HD 8801 as a metallic line
(Am) star. We also determined an upper limit on the magnetic field strength.
Our abundance analysis is based on classical techniques, but uses for the final
step a model atmosphere calculated with the abundances determined by us. We
also discuss spectropolarimetric observations obtained for HD 8801. This object
is remarkable in several respects. It is a non-magnetic metallic line (Am)
star, pulsating simultaneously in p- and g-modes, but also shows oscillations
with periods in between these two domains, whose excitation requires
explanation. Overall, the pulsational incidence in unevolved classical Am stars
is believed to be quite low; HD 8801 does not conform to this picture. Finally,
about 75% of Am stars are located in short-period binaries, but there is no
evidence that HD 8801 has a companion.


title: Twenty-Five Sub-Arcsecond Binaries Discovered By Lunar Occultations

abstract:
  We report on 25 sub-arcsecond binaries, detected for the first time by means
of lunar occultations in the near-infrared as part of a long-term program using
the ISAAC instrument at the ESO Very Large Telescope. The primaries have
magnitudes in the range K=3.8 to 10.4, and the companions in the range K=6.4 to
12.1. The magnitude differences have a median value of 2.8, with the largest
being 5.4. The projected separations are in the range 6 to 748 milliarcseconds
and with a median of 18 milliarcseconds, or about 3 times less than the
diffraction limit of the telescope. Among our binary detections are a pre-main
sequence star and an enigmatic Mira-like variable previously suspected to have
a companion. Additionally, we quote an accurate first-time near-IR detection of
a previously known wider binary.
  We discuss our findings on an individual basis as far as made possible by the
available literature, and we examine them from a statistical point of view. We
derive a typical frequency of binarity among field stars of ~10%, in the
resolution and sensitivity range afforded by the technique (~0.003" to ~0.5",
and K~12mag, respectively). This is in line with previous results by the same
technique but we point out interesting differences that we can trace up to
sensitivity, time sampling, and average distance of the targets. Finally, we
discuss the prospects for further follow-up studies.


title:
Multiband superconductivity with unexpected deficiency of nodal
  quasiparticles in CeCu2Si2

abstract:
  Superconductivity in the heavy-fermion compound CeCu2Si2 is a prototypical
example of Cooper pairs formed by strongly correlated electrons. For more than
30 years, it has been believed to arise from nodal d-wave pairing mediated by a
magnetic glue. Here, we report a detailed study of the specific heat and
magnetization at low temperatures for a high-quality single crystal.
Unexpectedly, the specific-heat measurements exhibit exponential decay with a
two-gap feature in its temperature dependence, along with a linear dependence
as a function of magnetic field and the absence of oscillations in the field
angle, reminiscent of multiband full-gap superconductivity. In addition, we
find anomalous behavior at high fields, attributed to a strong Pauli
paramagnetic effect. A low quasiparticle density of states at low energies with
a multiband Fermi-surface topology would open a new door into electron pairing
in CeCu2Si2.


title: Studies of TMDs with CLAS

abstract:
  Studies of single and double-spin asymmetries in pion electro-production in
semi-inclusive deep-inelastic scattering of 5.8 GeV polarized electrons from
unpolarized and longitudinally polarized targets at the Thomas Jefferson
National Accelerator Facility using CLAS discussed. We present a
Bessel-weighting strategy to extract transverse-momentum-dependent parton
distribution functions.


title: Small Scale Microwave Bursts in Long-duration Solar Flares

abstract:
  Solar small scale microwave bursts (SMBs), including microwave dot, spike,
and narrow band type III bursts, are characterized with very short timescales,
narrow frequency bandwidth, and very high brightness temperatures. Based on
observations of the Chinese Solar Broadband Radio Spectrometer at Huairou with
superhigh cadence and frequency resolution, this work presents an intensive
investigation of SMBs in several flares occurred in active region NOAA 10720
during 2005 Jan 14-21. Especially long-duration flares, SMBs occurred not only
in early rising and impulsive phase, but also in the flare decay phase, and
even in time of after the flare ending. These SMBs are strong bursts with
inferred brightness temperature at least 8.18*10^11 - 1.92*10^13 K, very short
lifetime of 5-18 ms, relative frequency bandwidths of 0.7-3.5%, and superhigh
frequency drifting rates. Together with their obviously different polarizations
from the background emission (the quiet Sun, and the underlying flaring
broadband continuum), such SMBs should be individual independent strong
coherent bursts which is related to some non-thermal energy releasing and
production of energetic particles in small scale source region. These facts
show the existence of small scale strong non-thermal energy releasing
activities after the flare maxima, which is meaningful to the prediction of
space weather. Physical analysis indicates that plasma mechanism may be the
most favorable candidate for the formation of SMBs. From plasma mechanism, the
velocities and kinetic energy of fast electrons can be deduced, and the region
of electron acceleration can also be tracke.


title:
Observational Asteroseismology of Hot Subdwarf Stars with the
  Mont4K/Kuiper Combination at the Steward Observatory Mount Bigelow Station

abstract:
  In the last few years, we have carried out several extensive observational
campaigns on pulsating hot subdwarf stars using the Mont4K CCD camera attached
to the 1.55 m Kuiper Telescope on Mount Bigelow. The Mont4K is a joint
partnership between the University of Arizona and Universite de Montreal. It
was designed and built at Steward Observatory. Using the Mont4K/Kuiper
combination, we have so far, and among others, gathered high-sensitivity
broadband light curves for PG 1219+534, PB8783, HS 0702+6043, and Feige 48. We
report very briefly on some of the most interesting observational results that
came out of these campaigns.


title:
Swift and RXTE observations of the black hole transient GX 339-4 in the
  hard state between outbursts

abstract:
  We use simultaneous Swift and RXTE observations of the black hole binary GX
339-4 to measure the inner radius of its accretion disk in the hard state down
to 0.4% L_{Edd} via modeling of the thermal disk emission and the
relativistically broadened iron line. For the luminosity range covered in this
work, our results rule out a significantly truncated disk at 100-1000 R_g as
predicted by the advection-dominated accretion flow paradigm. The measurements
depend strongly on the assumed emission geometry, with most results providing
no clear picture of radius evolution. If the inclination is constrained to
roughly 20 degrees, however, the measurements based on the thermal disk
emission suggest a mildly receding disk at a luminosity of 0.4% L_{Edd}. The
iron abundance varies between roughly 1-2 solar abundances, with the i=20
degrees results indicating a negative correlation with luminosity, though this
is likely due to a change in disk illumination geometry.


title:
Enhanced quantum oscillatory magnetization and non-equilibrium currents
  in an interacting two-dimensional electron system in MgZnO/ZnO with repulsive
  scatterers

abstract:
  Torque magnetometry at low temperature and in high magnetic fields B is
performed on a MgZnO/ZnO heterostructure incorporating a high-mobility
two-dimensional electron system. We find a sawtooth-like quantum oscillatory
magnetization M(B), i.e., the de Haas-van Alphen (dHvA) effect. At the same
time, unexpected spike-like overshoots in M and non-equilibrium currents are
observed which allow us to identify the microscopic nature and density of the
residual disorder. The acceptor-like scatterers give rise to a magnetic thaw
down effect which enhances the dHvA amplitude beyond the electron-electron
interaction effects being present in the MgZnO/ZnO heterostructure


title:
Electrical detection of topological quantum phase transitions in
  disordered Majorana nanowires

abstract:
  We study a disordered superconducting nanowire, with broken time-reversal and
spin-rotational symmetry, which can be driven into a topological phase with end
Majorana bound states by an externally applied magnetic field. As a function of
disorder strength, it is known that the Majorana nanowire has a delocalization
quantum phase transition from a topologically nontrivial phase, which supports
Majorana bound states, to a nontopological insulating phase without them. On
both sides of the transition, the system is localized at zero energy albeit
with very different topological properties. We exploit this deep connection
between topology and localization properties to propose an electrical transport
measurement to detect the localization-delocalization transition occurring in
the bulk of the nanowire. The basic idea consists of measuring the difference
of conductance at one end of the wire obtained at different values of the
coupling to the opposite lead. We show that this measurement reveals the
nonlocal correlations emergent only at the topological transition. Hence, while
the proposed experiment does not directly probe the end Majorana bound states,
it can provide direct evidence for the bulk topological quantum phase
transition itself.


title: Comments on World-Sheet Form Factors in AdS/CFT

abstract:
  We study form factors in the light-cone gauge world-sheet theory for strings
in AdS_5 x S^5. We perturbatively calculate the two-particle form factor in a
closed su(2) sector to one-loop in the near-plane-wave limit and to two-loops
in the Maldacena-Swanson limit. We also perturbatively solve the functional
equation which follows from the form factor axioms for the world-sheet theory
and show that the "minimal" solution correctly reproduces the discontinuities
of the perturbative calculations. Finally we propose a prescription, valid for
polynomial orders of the inverse world-sheet length, for extracting the
finite-volume world-sheet matrix element from the form factors and show that
the two-excitation matrix element matches with the thermodynamic limit of the
spin-chain description of certain tree-level N=4 SYM structure constants.


title:
The Sunspot Catalogues of Carrington, Peters, and de la Rue: Quality
  Control and Machine-readable Versions

abstract:
  In the 19th century, several astronomers made observations of sunspots,
recording their positions and sometimes their areas. These observations were
published in the form of extensive tables, but have been unhelpful until now.
Three of these observers were Richard C. Carrington, Christian H. F. Peters,
and Warren de la Rue (and their respective collaborators). They published, in
various articles the data corresponding to 26 641 sunspot positions
(Carrington, Peters, and de la Rue registered 4 900, 14 040, and 7 701 sunspot
positions, respectively). In this paper we present a translation of more than
400 pages of their printed numerical tables into a machine readable format,
including an initial analysis targeted at detecting possible mistakes in the
reading or in the original transcription. The observations carried out by these
three astronomers have been made available at the Centre de Don\'ees
Astronomiques de Strasbourg
(http://cdsarc.u-strasbg.fr/cgi-bin/VizieR?-source=VI/138).


title: Treatment of heavy quarks in QCD

abstract:
  We show that to correctly describe the effects of the heavy-quark mass, m_h,
in DGLAP evolution, it is necessary to work in the so-called `physical' scheme.
In this way, we automatically obtain a smooth transition through the
heavy-quark thresholds. Moreover, we show that to obtain NLO accuracy, it is
sufficient to account for the heavy-quark mass, m_h, just in the LO (one-loop)
splitting function. The use of the MS-bar factorisation scheme is not
appropriate, since at NLO we deal with a mixture of quarks and gluon (that is,
the mass of the heavy parton is not well-defined). The formulae for the
explicit m_h dependence of the splitting functions, and for alpha_s, are
presented.


title: Single-Photon Switch based on Rydberg Blockade

abstract:
  All-optical switching is a technique in which a gate light pulse changes the
transmission of a target light pulse without the detour via electronic signal
processing. We take this to the quantum regime, where the incoming gate light
pulse contains only one photon on average. The gate pulse is stored as a
Rydberg excitation in an ultracold atomic gas using electromagnetically induced
transparency. Rydberg blockade suppresses the transmission of the subsequent
target pulse. Finally, the stored gate photon can be retrieved. A retrieved
photon heralds successful storage. The corresponding postselected subensemble
shows an extinction of 0.05. The single-photon switch offers many interesting
perspectives ranging from quantum communication to quantum information
processing.


title:
Sharp crossover from composite fermionization to phase separation in
  mesoscopic mixtures of ultracold bosons

abstract:
  We show that a two-component mixture of a few repulsively interacting
ultracold atoms in a one-dimensional trap possesses very different quantum
regimes and that the crossover between them can be induced by tuning the
interactions in one of the species. In the composite fermionization regime,
where the interactions between both components are large, none of the species
show large occupation of any natural orbital. Our results show that by
increasing the interaction in one of the species, one can reach the
phase-separated regime. In this regime, the weakly interacting component stays
at the center of the trap and becomes almost fully phase coherent, while the
strongly interacting component is displaced to the edges of the trap. The
crossover is sharp, as observed in the in the energy and the in the largest
occupation of a natural orbital of the weakly interacting species. Such a
transition is a purely mesoscopic effect which disappears for large atom
numbers.


title: Bounded type interval exchange maps

abstract:
  Irrational numbers of bounded type have several equivalent characterizations.
They have bounded partial quotients in terms of arithmetic characterization and
in the dynamics of the circle rotation, the rescaled recurrence time to
$r$-ball of the initial point is bounded below. In this paper, we consider how
the bounded type condition of irrational is generalized into interval exchange
maps.


title: Coherent diffraction of thermal currents in Josephson tunnel junctions

abstract:
  We theoretically investigate heat transport in temperature-biased Josephson
tunnel junctions in the presence of an in-plane magnetic field. In full analogy
with the Josephson critical current, the phase-dependent component of the heat
flux through the junction displays coherent diffraction. Thermal transport is
analyzed in three prototypical junction geometries highlighting their main
differences. Notably, minimization of the Josephson coupling energy requires
the quantum phase difference across the junction to undergo \pi-slips in
suitable intervals of magnetic flux. An experimental setup suited to detect
thermal diffraction is proposed and analyzed.


title: Oriented Event Shapes at N3LL + O(as^2)

abstract:
  We analyze oriented event-shapes in the context of Soft-Collinear Effective
Theory (SCET) and in Fixed-Order perturbation theory. Oriented event-shapes are
distributions of event-shape variables which are differential on the angle
theta_T that the thrust axis forms with the electron-positron beam. We show
that at any order in perturbation theory and for any event shape, only two
angular structures can appear: F_0 = 3/8(1 + cos^2 theta_T) and F_1 = (1 -
3cos^2 theta_T). When integrating over theta_T to recover the more familiar
event-shape distributions, only F_0 survives. The validity of our proof goes
beyond perturbation theory, and hence only these two structures are present at
the hadron level. The proof also carries over massive particles. Using SCET
techniques we show that singular terms can only arise in the F_0 term. Since
only the hard function is sensitive to the orientation of the thrust axis, this
statement applies also for recoil-sensitive variables such as Jet Broadening.
We carry out resummation at N3LL of singular terms for Thrust, Heavy-Jet Mass,
the sum of the Hemisphere Masses and C-parameter. We also compute the
Fixed-Order distributions for these event-shapes at O(as) analytically and at
O(as^2) with the program Event2.


title:
Quantum and classical features of the photoionization spectrum of
  C$_{60}$

abstract:
  By considering photoionization of the C$_{60}$ fullerene, we elucidate the
contributions of various classical and quantum physics phenomena appearing in
this process. By comparing the results, based on the {\it ab initio} and model
approaches, we map the well-resolved features of the photoabsoprtion spectrum
to single-particle and collective excitations which have the different physical
nature. It is demonstrated that the peculiarities arising in the
photoionization spectrum of C$_{60}$ atop the dominating plasmon excitations
have the quantum origin. In particular, we demonstrate that a series of
individual peaks can be assigned either to the optically allowed discrete
transitions or to ionization of particular molecular orbitals of the system.
The analysis performed gives a detailed information on the nature of numerous
features in the photoabsorption spectrum of C$_{60}$.


title: QuorUM: an error corrector for Illumina reads

abstract:
  Motivation: Illumina Sequencing data can provide high coverage of a genome by
relatively short (100 bp150 bp) reads at a low cost. Our goal is to produce
trimmed and error-corrected reads to improve genome assemblies. Our error
correction procedure aims at producing a set of error-corrected reads (1)
minimizing the number of distinct false k-mers, i.e. that are not present in
the genome, in the set of reads and (2) maximizing the number that are true,
i.e. that are present in the genome. Because coverage of a genome by Illumina
reads varies greatly from point to point, we cannot simply eliminate k-mers
that occur rarely.
  Results: Our software, called QuorUM, provides reasonably accurate correction
and is suitable for large data sets (1 billion bases checked and corrected per
day per core).
  Availability: QuorUM is distributed as an independent software package and as
a module of the MaSuRCA assembly software. Both are available under the GPL
open source license at http://www.genome.umd.edu.
  Contact: gmarcais@umd.edu


title:
Massive symmetry breaking in LaAlO$_3$/SrTiO$_3$(111) quantum wells: a
  three-orbital, strongly correlated generalization of graphene

abstract:
  Density functional theory calculations with an on-site Coulomb repulsion term
(GGA+U method) reveal competing ground states in (111) oriented
(LaAlO$_3$)$_M$/(SrTiO$_3$)$_N$ superlattices with n-type interfaces, ranging
from spin, orbital polarized, Dirac point Fermi surface to charge ordered flat
band phases. These are steered by the interplay of (i) Hubbard U, (ii)
SrTiO$_3$ quantum well thickness and (iii) crystal field spitting tied to
in-plane strain. In the honeycomb lattice bilayer case N=2 under tensile strain
inversion symmetry breaking drives the system from a ferromagnetic Dirac point
(massless Weyl semimetal) to a charge ordered multiferroic (ferromagnetic and
ferroelectric) flat band massive (insulating) phase. With increasing SrTiO$_3$
quantum well thickness an insulator-to-metal transition occurs.


title: Holographic entanglement entropy in nonlocal theories

abstract:
  We compute holographic entanglement entropy in two strongly coupled nonlocal
field theories: the dipole and the noncommutative deformations of SYM theory.
We find that entanglement entropy in the dipole theory follows a volume law for
regions smaller than the length scale of nonlocality and has a smooth
cross-over to an area law for larger regions. In contrast, in the
noncommutative theory the entanglement entropy follows a volume law for up to a
critical length scale at which a phase transition to an area law occurs. The
critical length scale increases as the UV cutoff is raised, which is indicative
of UV/IR mixing and implies that entanglement entropy in the noncommutative
theory follows a volume law for arbitrary large regions when the size of the
region is fixed as the UV cutoff is removed to infinity. Comparison of
behaviour between these two theories allows us to explain the origin of the
volume law. Since our holographic duals are not asymptotically AdS, minimal
area surfaces used to compute holographic entanglement entropy have novel
behaviours near the boundary of the dual spacetime. We discuss implications of
our results on the scrambling (thermalization) behaviour of these nonlocal
field theories.


title: Neutrino Masses

abstract:
  The various experiments on neutrino oscillation evidenced that neutrinos have
indeed non-zero masses but cannot tell us the absolute neutrino mass scale.
This scale of neutrino masses is very important for understanding the evolution
and the structure formation of the universe as well as for nuclear and particle
physics beyond the present Standard Model. Complementary to deducing
constraints on the sum of all neutrino masses from cosmological observations
two different methods to determine the neutrino mass scale in the laboratory
are pursued: the search for neutrinoless double $\beta$-decay and the direct
neutrino mass search by investigating single $\beta$-decays or electron
captures. The former method is not only sensitive to neutrino masses but also
probes the Majorana character of neutrinos and thus lepton number violation
with high sensitivity. Currently quite a few experiments with different
techniques are being constructed, commissioned or are even running, which aim
for a sensitivity on the neutrino mass of {\cal O}(100) meV. The principle
methods and these experiments will be discussed in this short review.


title: kruX: Matrix-based non-parametric eQTL discovery

abstract:
  The Kruskal-Wallis test is a popular non-parametric statistical test for
identifying expression quantitative trait loci (eQTLs) from genome-wide data
due to its robustness against variations in the underlying genetic model and
expression trait distribution, but testing billions of marker-trait
combinations one-by-one can become computationally prohibitive. We developed
kruX, an algorithm implemented in Matlab, Python and R that uses matrix
multiplications to simultaneously calculate the Kruskal-Wallis test statistic
for several millions of marker-trait combinations at once. KruX is more than
ten thousand times faster than computing associations one-by-one on a typical
human dataset. We used kruX and a dataset of more than 500k SNPs and 20k
expression traits measured in 102 human blood samples to compare eQTLs detected
by the Kruskal-Wallis test to eQTLs detected by the parametric ANOVA and linear
model methods. We found that the Kruskal-Wallis test is more robust against
data outliers and heterogeneous genotype group sizes and detects a higher
proportion of non-linear associations, but is more conservative for calling
additive linear associations. In summary, kruX enables the use of robust
non-parametric methods for massive eQTL mapping without the need for a
high-performance computing infrastructure.