title:
Sequential Detection of an Abrupt Change in a Random Sequence with
  Unknown Initial State

abstract:
  The problem of sequentially detecting an abrupt change in a sequence of
independent and identically distributed (IID) random variables is addressed.
Whereas previous approaches assume a known probability density function (PDF)
at the start of the sequence, the problem addressed is the detection of a
single change in distribution among a finite number of known 'equal-energy'
PDFs, but where the initial and final distributions are not known a priori. A
Bayesian multiple hypothesis approach is proposed where (i) unlike previous
threshold policies, the minimum cost hypothesis is tracked through time, (ii)
under an exponential delay-cost function that satisfies an upper bound
determined by the distances between hypotheses, the probability of detecting a
change from an incorrect initial distribution asymptotically vanishes with
time, (iii) computation is recursive and constant per unit time, and (iv) the
unknown initial state gives rise to unavoidable incorrect detections that be
made to vanish with a constant test threshold with negligibly small effect on
correct detection delay for change times beyond a lower bound. Simulations
illustrate the analysis and reveal that average delay approaches that of the
optimal CUSUM test after an initial transient period determined by an incorrect
detection probability constraint.


title: Lattice operations on Rickart *-rings

abstract:
  Various authors have investigated properties of the star order (introduced by
M.P. Drazin in 1978) on algebras of matrices and of bounded linear operators on
a Hilbert space. Rickart involution rings (*-rings) are a certain algebraic
analogue of von Neumann algebras, which cover these particular algebras. In
1983, M.F. Janowitz proved, in particular, that, in a star-ordered Rickart
*-ring, every pair of elements bounded from above has a meet and also a join.
However, the latter conclusion seems to be based on some wrong assumption. We
show that the conclusion is nevertheless correct, and provide equational
descriptions of joins and meets for this case. We also present various general
properties of the star order in Rickart *-rings, give several necessary and
sufficient conditions (again, equational) for a pair of elements to have a
least upper bound of a special kind, and discuss the question when a
star-ordered Rickart*-ring is a lower semilattice.


title:
Hybrid-cascade Coupled-Line Phasers for High-resolution Radio-Analog
  Signal Processing

abstract:
  A hybrid-cascade (HC) coupled-line phaser configuration is presented to
synthesize enhanced group delay responses for high-resolution Radio-Analog
Signal Processing (R-ASP). Using exact analytical transfer functions, the
superiority of HC coupled-line phasers over conventional transversally cascaded
C-section phasers is demonstrated and verified using full-wave simulations.


title:
Finite difference numerical method for the superlattice Boltzmann
  transport equation and case comparison of CPU(C) and GPU(CUDA)
  implementations

abstract:
  We present a finite difference numerical algorithm for solving two
dimensional spatially homogeneous Boltzmann transport equation which describes
electron transport in a semiconductor superlattice subject to crossed time
dependent electric and constant magnetic fields. The algorithm is implemented
both in C language targeted to CPU and in CUDA C language targeted to commodity
NVidia GPU. We compare performances and merits of one implementation versus
another and discuss various software optimization techniques.


title: Replanning in Domains with Partial Information and Sensing Actions

abstract:
  Replanning via determinization is a recent, popular approach for online
planning in MDPs. In this paper we adapt this idea to classical, non-stochastic
domains with partial information and sensing actions, presenting a new planner:
SDR (Sample, Determinize, Replan). At each step we generate a solution plan to
a classical planning problem induced by the original problem. We execute this
plan as long as it is safe to do so. When this is no longer the case, we
replan. The classical planning problem we generate is based on the
translation-based approach for conformant planning introduced by Palacios and
Geffner. The state of the classical planning problem generated in this approach
captures the belief state of the agent in the original problem. Unfortunately,
when this method is applied to planning problems with sensing, it yields a
non-deterministic planning problem that is typically very large. Our main
contribution is the introduction of state sampling techniques for overcoming
these two problems. In addition, we introduce a novel, lazy, regression-based
method for querying the agents belief state during run-time. We provide a
comprehensive experimental evaluation of the planner, showing that it scales
better than the state-of-the-art CLG planner on existing benchmark problems,
but also highlighting its weaknesses with new domains. We also discuss its
theoretical guarantees.


title:
Generating Approximate Solutions to the TTP using a Linear Distance
  Relaxation

abstract:
  In some domestic professional sports leagues, the home stadiums are located
in cities connected by a common train line running in one direction. For these
instances, we can incorporate this geographical information to determine
optimal or nearly-optimal solutions to the n-team Traveling Tournament Problem
(TTP), an NP-hard sports scheduling problem whose solution is a double
round-robin tournament schedule that minimizes the sum total of distances
traveled by all n teams. We introduce the Linear Distance Traveling Tournament
Problem (LD-TTP), and solve it for n=4 and n=6, generating the complete set of
possible solutions through elementary combinatorial techniques. For larger n,
we propose a novel "expander construction" that generates an approximate
solution to the LD-TTP. For n congruent to 4 modulo 6, we show that our
expander construction produces a feasible double round-robin tournament
schedule whose total distance is guaranteed to be no worse than 4/3 times the
optimal solution, regardless of where the n teams are located. This
4/3-approximation for the LD-TTP is stronger than the currently best-known
ratio of 5/3 + epsilon for the general TTP. We conclude the paper by applying
this linear distance relaxation to general (non-linear) n-team TTP instances,
where we develop fast approximate solutions by simply "assuming" the n teams
lie on a straight line and solving the modified problem. We show that this
technique surprisingly generates the distance-optimal tournament on all
benchmark sets on 6 teams, as well as close-to-optimal schedules for larger n,
even when the teams are located around a circle or positioned in
three-dimensional space.


title:
Integrative Semantic Dependency Parsing via Efficient Large-scale
  Feature Selection

abstract:
  Semantic parsing, i.e., the automatic derivation of meaning representation
such as an instantiated predicate-argument structure for a sentence, plays a
critical role in deep processing of natural language. Unlike all other top
systems of semantic dependency parsing that have to rely on a pipeline
framework to chain up a series of submodels each specialized for a specific
subtask, the one presented in this article integrates everything into one
model, in hopes of achieving desirable integrity and practicality for real
applications while maintaining a competitive performance. This integrative
approach tackles semantic parsing as a word pair classification problem using a
maximum entropy classifier. We leverage adaptive pruning of argument candidates
and large-scale feature selection engineering to allow the largest feature
space ever in use so far in this field, it achieves a state-of-the-art
performance on the evaluation data set for CoNLL-2008 shared task, on top of
all but one top pipeline system, confirming its feasibility and effectiveness.


title:
Towards a geometric interpretation of generalized fractional integrals -
  Erdelyi-Kober type integrals on $R^N$ as an example

abstract:
  A family of generalized Erdelyi-Kober type fractional integrals is
interpreted geometrically as a distortion of the rotationally invariant
integral kernel of the Riesz fractional integral in terms of generalized
Cassini ovaloids on $R^N$. Based on this geometric view, several extensions are
discussed.


title: Fundamental Principle of Information-to-Energy Conversion

abstract:
  The equivalence of 1 bit of information to entropy was given by Landauer in
1961 as kln2, k the Boltzmann constant. Erasing information implies heat
dissipation and the energy of 1 bit would then be (the Landauers limit) kT ln
2, T being the ambient temperature. From a quantum-cosmological point of view
the minimum quantum of energy in the universe corresponds today to a
temperature of 10^(-29) degrees K, probably forming a cosmic background of a
Bose condensate [1]. Then, the bit with minimum energy today in the Universe is
a quantum of energy 10^(-45)ergs, with an equivalent mass of 10^(-66)g. Low
temperature implies low energy per bit and, of course, this is the way for
faster and less energy dissipating computing devices. Our conjecture is this:
the possibility of a future access to the CBBC (a coupling/channeling?) would
mean a huge jump in the performance of these devices.


title: Flows over time in time-varying networks

abstract:
  There has been much research on network flows over time due to their
important role in real world applications. This has led to many results, but
the more challenging continuous time model still lacks some of the key concepts
and techniques that are the cornerstones of static network flows. The aim of
this paper is to advance the state of the art for dynamic network flows by
developing the continuous time analogues of the theory for static network
flows. Specifically, we make use of ideas from the static case to establish a
reduced cost optimality condition, a negative cycle optimality condition, and a
strong duality result for a very general class of network flows over time.


title:
Computing the inverses, their power sums, and extrema for Euler's
  totient and other multiplicative functions

abstract:
  We propose a generic algorithm for computing the inverses of a multiplicative
function under the assumption that the set of inverses is finite. More
generally, our algorithm can compute certain functions of the inverses, such as
their power sums (e.g., cardinality) or extrema, without direct enumeration of
the inverses. We illustrate our algorithm with Euler's totient function
$\varphi(\cdot)$ and the $k$-th power sum of divisors $\sigma_k(\cdot)$. For
example, we can establish that the number of solutions to $\sigma_1(x) =
10^{1000}$ is 15,512,215,160,488,452,125,793,724,066,873,737,608,071,476, while
it is intractable to iterate over the actual solutions.


title: Moderate deviations for recursive stochastic algorithms

abstract:
  We prove a moderate deviation principle for the continuous time interpolation
of discrete time recursive stochastic processes. The methods of proof are
somewhat different from the corresponding large deviation result, and in
particular the proof of the upper bound is more complicated. The results can be
applied to the design of accelerated Monte Carlo algorithms for certain
problems, where schemes based on moderate deviations are easier to construct
and in certain situations provide performance comparable to those based on
large deviations.


title:
Experimental stress-strain analysis of tapered silica optical fibers
  with nanofiber waist

abstract:
  We experimentally determine tensile force-elongation diagrams of tapered
optical fibers with a nanofiber waist. The tapered optical fibers are produced
from standard silica optical fibers using a heat and pull process. Both, the
force-elongation data and scanning electron microscope images of the rupture
points indicate a brittle material. Despite the small waist radii of only a few
hundred nanometers, our experimental data can be fully explained by a nonlinear
stress-strain model that relies on material properties of macroscopic silica
optical fibers. This is an important asset when it comes to designing
miniaturized optical elements as one can rely on the well-founded material
characteristics of standard optical fibers. Based on this understanding, we
demonstrate a simple and non-destructive technique that allows us to determine
the waist radius of the tapered optical fiber. We find excellent agreement with
independent scanning electron microscope measurements of the waist radius.


title: Simplified differential equations approach for Master Integrals

abstract:
  A simplified differential equations approach for Master Integrals is
presented. It allows to express them, straightforwardly, in terms of Goncharov
Polylogarithms. As a proof-of-concept of the proposed method, results at one
and two loops are presented, including the massless one-loop pentagon with up
to one off-shell leg at order epsilon.


title:
The Readability of Tweets and their Geographic Correlation with
  Education

abstract:
  Twitter has rapidly emerged as one of the largest worldwide venues for
written communication. Thanks to the ease with which vast quantities of tweets
can be mined, Twitter has also become a source for studying modern linguistic
style. The readability of text has long provided a simple method to
characterize the complexity of language and ease that documents may be
understood by readers. In this note we use a modified version of the Flesch
Reading Ease formula, applied to a corpus of 17.4 million tweets. We find
tweets have characteristically more difficult readability scores compared to
other short format communication, such as SMS or chat. This linguistic
difference is insensitive to the presence of "hashtags" within tweets. By
utilizing geographic data provided by 2% of users, joined with "ZIP Code
Tabulation Area" (ZCTA) level education data from the U.S. Census, we find an
intriguing correlation between the average readability and the college
graduation rate within a ZCTA. This points towards a difference in either the
underlying language, or a change in the type of content being tweeted in these
areas


title:
Dynamics of localized and patterned structures in the Lugiato-Lefever
  equation determine the stability and shape of optical frequency combs

abstract:
  It has been recently uncovered that coherent structures in microresonators
such as cavity solitons and patterns are intimately related to Kerr frequency
combs. In this work, we present a general analysis of the regions of existence
and stability of cavity solitons and patterns in the Lugiato-Lefever equation,
a mean-field model that finds applications in many different nonlinear optical
cavities. We demonstrate that the rich dynamics and coexistence of multiple
solutions in the Lugiato-Lefever equation are of key importance to
understanding frequency comb generation. A detailed map of how and where to
target stable Kerr frequency combs in the parameter space defined by the
frequency detuning and the pump power is provided. Moreover, the work presented
also includes the organization of various dynamical regimes in terms of
bifurcation points of higher co-dimension in regions of parameter space that
were previously unexplored in the Lugiato-Lefever equation. We discuss
different dynamical instabilities such as oscillations and chaotic regimes.


title: Achieving Marton's Region for Broadcast Channels Using Polar Codes

abstract:
  This paper presents polar coding schemes for the 2-user discrete memoryless
broadcast channel (DM-BC) which achieve Marton's region with both common and
private messages. This is the best achievable rate region known to date, and it
is tight for all classes of 2-user DM-BCs whose capacity regions are known. To
accomplish this task, we first construct polar codes for both the superposition
as well as the binning strategy. By combining these two schemes, we obtain
Marton's region with private messages only. Finally, we show how to handle the
case of common information. The proposed coding schemes possess the usual
advantages of polar codes, i.e., they have low encoding and decoding complexity
and a super-polynomial decay rate of the error probability.
  We follow the lead of Goela, Abbe, and Gastpar, who recently introduced polar
codes emulating the superposition and binning schemes. In order to align the
polar indices, for both schemes, their solution involves some degradedness
constraints that are assumed to hold between the auxiliary random variables and
the channel outputs. To remove these constraints, we consider the transmission
of $k$ blocks and employ a chaining construction that guarantees the proper
alignment of the polarized indices. The techniques described in this work are
quite general, and they can be adopted to many other multi-terminal scenarios
whenever there polar indices need to be aligned.


title: Baire spaces and infinite games

abstract:
  It is well known that if the nonempty player of the Banach-Mazur game has a
winning strategy on a space, then that space is Baire in all powers even in the
box topology. The converse of this implication may be true also: We know of no
consistency result to the contrary. In this paper we establish the consistency
of the converse relative to the consistency of the existence of a proper class
of measurable cardinals.


title:
Quantization of systems with temporally varying discretization I:
  Evolving Hilbert spaces

abstract:
  A temporally varying discretization often features in discrete gravitational
systems and appears in lattice field theory models subject to a coarse graining
or refining dynamics. To better understand such discretization changing
dynamics in the quantum theory, an according formalism for constrained
variational discrete systems is constructed. While the present manuscript
focuses on global evolution moves and, for simplicity, restricts to Euclidean
configuration spaces, a companion article discusses local evolution moves. In
order to link the covariant and canonical picture, the dynamics of the quantum
states is generated by propagators which satisfy the canonical constraints and
are constructed using the action and group averaging projectors. This projector
formalism offers a systematic method for tracing and regularizing divergences
in the resulting state sums. Non-trivial coarse graining evolution moves lead
to non-unitary, and thus irreversible, projections of physical Hilbert spaces
and Dirac observables such that these concepts become evolution move dependent
on temporally varying discretizations. The formalism is illustrated in a toy
model mimicking a `creation from nothing'. Subtleties arising when applying
such a formalism to quantum gravity models are discussed.


title:
Resource cost results for one-way entanglement distillation and state
  merging of compound and arbitrarily varying quantum sources

abstract:
  We consider one-way quantum state merging and entanglement distillation under
compound and arbitrarily varying source models. Regarding quantum compound
sources, where the source is memoryless, but the source state an unknown member
of a certain set of density matrices, we continue investigations begun in the
work of Bjelakovi\'c et. al. [Universal quantum state merging, J. Math. Phys.
54, 032204 (2013)] and determine the classical as well as entanglement cost of
state merging. We further investigate quantum state merging and entanglement
distillation protocols for arbitrarily varying quantum sources (AVQS). In the
AVQS model, the source state is assumed to vary in an arbitrary manner for each
source output due to environmental fluctuations or adversarial manipulation. We
determine the one-way entanglement distillation capacity for AVQS, where we
invoke the famous robustification and elimination techniques introduced by R.
Ahlswede. Regarding quantum state merging for AVQS we show by example, that the
robustification and elimination based approach generally leads to suboptimal
entanglement as well as classical communication rates.


title:
FORC and Micromagnetism Approach to the Domain Structure of Cobalt
  Antidot Arrays

abstract:
  We study the influence of the porosity on the domain structure of cobalt
antidots thin films with controlled and circular defects of 20, 40 and 60 nm of
diameter. Micromagnetic simulations, combined with First-order reversal curves
analysis of classical magnetometry measurements, have been used to track the
evolution of the magnetic domain configurations. The found coercivity
enhancement with the increase of the pore diameter is correlated to the domain
reversibility. Moreover, we found that when the pores diameter increases the
domain-domain interactions become dominant.


title: Information percolation and cutoff for the stochastic Ising model

abstract:
  We introduce a new framework for analyzing Glauber dynamics for the Ising
model. The traditional approach for obtaining sharp mixing results has been to
appeal to estimates on spatial properties of the stationary measure from within
a multi-scale analysis of the dynamics. Here we propose to study these
simultaneously by examining "information percolation" clusters in the
space-time slab.
  Using this framework, we obtain new results for the Ising model on
$(\mathbb{Z}/n\mathbb{Z})^d$ throughout the high temperature regime:
total-variation mixing exhibits cutoff with an $O(1)$-window around the time at
which the magnetization is the square-root of the volume. (Previously, cutoff
in the full high temperature regime was only known for $d\leq 2$, and only with
an $O(\log\log n)$-window.)
  Furthermore, the new framework opens the door to understanding the effect of
the initial state on the mixing time. We demonstrate this on the 1D Ising
model, showing that starting from the uniform ("disordered") initial
distribution asymptotically halves the mixing time, whereas almost every
deterministic starting state is asymptotically as bad as starting from the
("ordered") all-plus state.


title:
Reconstruction of the gravitational wave signal $h(t)$ during the Virgo
  science runs and independent validation with a photon calibrator

abstract:
  The Virgo detector is a kilometer-scale interferometer for gravitational wave
detection located near Pisa (Italy). About 13 months of data were accumulated
during four science runs (VSR1, VSR2, VSR3 and VSR4) between May 2007 and
September 2011, with increasing sensitivity.
  In this paper, the method used to reconstruct, in the range 10 Hz-10 kHz, the
gravitational wave strain time series $h(t)$ from the detector signals is
described. The standard consistency checks of the reconstruction are discussed
and used to estimate the systematic uncertainties of the $h(t)$ signal as a
function of frequency. Finally, an independent setup, the photon calibrator, is
described and used to validate the reconstructed $h(t)$ signal and the
associated uncertainties.
  The uncertainties of the $h(t)$ time series are estimated to be 8% in
amplitude. The uncertainty of the phase of $h(t)$ is 50 mrad at 10 Hz with a
frequency dependence following a delay of 8 $\mu$s at high frequency. A bias
lower than $4\,\mathrm{\mu s}$ and depending on the sky direction of the GW is
also present.


title: Modified Bose-Einstein Condensate Black Holes in d Dimensions

abstract:
  [Remark: Much more natural and important models are studied in
arXiv:1405.2083. Furthermore, the physical picture given there is much more
complete.] The quantum N-portrait -- black holes pictured as Bose-Einstein
condensates -- is studied for a special class of models in arbitrary
dimensions. In the presence of extra dimensions, the depletion rate is shown to
be significantly enhanced in these models as compared to standard
semi-classical results. Consequences for large as well as micro condensates are
discussed. Speculations are made on a possible connection of higher-dimensional
graviton condensates, strings and branes.


title: Partial Reduction and Delaunay/Deprit Variables

abstract:
  Based on a concept link between the partial reduction procedure of the
reduction of the rotational symmetry of the N-body problem with the symplectic
cross-section theorem of Guillemin-Sternberg, we present alternative proofs of
the symplecticity of Delaunay and Deprit coordinates in celestial mechanics.


title: On Continuous-Time White Phase Noise Channels

abstract:
  A continuous-time model for the additive white Gaussian noise (AWGN) channel
in the presence of white (memoryless) phase noise is proposed and discussed. It
is shown that for linear modulation the output of the baud-sampled filter
matched to the shaping waveform represents a sufficient statistic. The analysis
shows that the phase noise channel has the same information rate as an AWGN
channel but with a penalty on the average signal-to-noise ratio, the amount of
penalty depending on the phase noise statistic.


title: On Fence Patrolling by Mobile Agents

abstract:
  Suppose that a fence needs to be protected (perpetually) by $k$ mobile agents
with maximum speeds $v_1,\ldots,v_k$ so that no point on the fence is left
unattended for more than a given amount of time. The problem is to determine if
this requirement can be met, and if so, to design a suitable patrolling
schedule for the agents. Alternatively, one would like to find a schedule that
minimizes the \emph{idle time}, that is, the longest time interval during which
some point is not visited by any agent. We revisit this problem, introduced by
Czyzowicz et al.(2011), and discuss several strategies for the cases where the
fence is an open and a closed curve, respectively.
  In particular: (i) we disprove a conjecture by Czyzowicz et al. regarding the
optimality of their Algorithm ${\mathcal A_2}$ for unidirectional patrolling of
a closed fence; (ii) we present an algorithm with a lower idle time for
patrolling an open fence, improving an earlier result of Kawamura and
Kobayashi.


title:
Absolute calibration of photon-number-resolving detectors with an analog
  output using twin beams

abstract:
  A method for absolute calibration of a photon-number resolving detector
producing analog signals as the output is developed using a twin beam. The
method gives both analog-to-digital conversion parameters and quantum detection
efficiency for the photon fields. Characteristics of the used twin beam are
also obtained. A simplified variant of the method applicable to fields with
high signal to noise ratios and suitable for more intense twin beams is
suggested.


title:
Single-atom interferometer based on two-dimensional spatial adiabatic
  passage

abstract:
  In this work we propose a novel single-atom interferometer based on a fully
two-dimensional spatial adiabatic passage process using a system of three
identical harmonic traps in a triangular geometry. While the transfer of a
single atom from the ground state of one trap to the ground state of the most
distant one can successfully be achieved in a robust way for a broad range of
parameter values, we point out the existence of a specific geometrical
configuration of the traps for which a crossing of two energy eigenvalues
occurs and the transfer of the atom fails. Instead the wavefunction is robustly
split into a coherent superposition between two of the traps. We show that this
process can be used to construct a single-atom interferometer and discuss its
performance in terms of the final population distribution among the asymptotic
eigenstates of the individual traps. This interferometric scheme could be used
to study space dependent fields from ultrashort to relatively large distances,
or the decay of the coherence of superposition states as a function of the
distance.


title:
Spin-correlations and magnetic structure in an Fe monolayer on 5d
  transition metal surfaces

abstract:
  We present a detailed first principles study on the magnetic structure of an
Fe monolayer on different surfaces of 5d transition metals. We use the
spin-cluster expansion technique to obtain parameters of a spin model, and
predict the possible magnetic ground state of the studied systems by employing
the mean field approach and in certain cases by spin dynamics calculations. We
point out that the number of shells considered for the isotropic exchange
interactions plays a crucial role in the determination of the magnetic ground
state. In the case of Ta substrate we demonstrate that the out-of-plane
relaxation of the Fe monolayer causes a transition from ferromagnetic to
antiferromagnetic ground state. We examine the relative magnitude of nearest
neighbour Dzyaloshinskii-Moriya (D) and isotropic (J) exchange interactions in
order to get insight into the nature of magnetic pattern formations. For the
Fe/Os(0001) system we calculate a very large D/J ratio, correspondingly, a spin
spiral ground state. We find that, mainly through the leading isotropic
exchange and Dzyaloshinskii-Moriya interactions, the inward layer relaxation
substantially influences the magnetic ordering of the Fe monolayer. For the
Fe/Re(0001) system characterized by large antiferromagnetic interactions we
also determine the chirality of the $120^{\circ}$ N\'eel-type ground state.


title: On the Spectral Singularities and Spectrality of the Hill Operator

abstract:
  First we study the spectral singularity at infinity and investigate the
connections of the spectral singularities and the spectrality of the Hill
operator. Then we consider the spectral expansion when there is not the
spectral singularity at infinity.


title:
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 1:
  Summary

abstract:
  These reports present the results of the 2013 Community Summer Study of the
APS Division of Particles and Fields ("Snowmass 2013") on the future program of
particle physics in the U.S. Chapter 1 contains the Executive Summary and the
summaries of the reports of the nine working groups.

categories: hep-ex astro-ph.CO hep-lat hep-ph hep-th


title:
Nonlinear mode-coupling and synchronization of a vacuum-trapped
  nanoparticle

abstract:
  We study the dynamics of a laser-trapped nanoparticle in high vacuum. Using
parametric coupling to an external excitation source, the linewidth of the
nanoparticle's oscillation can be reduced by three orders of magnitude. We show
that the oscillation of the nanoparticle and the excitation source are
synchronized, exhibiting a well-defined phase relationship. Furthermore, the
external source can be used to controllably drive the nanoparticle into the
nonlinear regime, thereby generating strong coupling between the different
translational modes of the nanoparticle. Our work contributes to the
understanding of the nonlinear dynamics of levitated nanoparticles in high
vacuum and paves the way for studies of pattern formation, chaos, and
stochastic resonance.


title:
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 2:
  Intensity Frontier

abstract:
  These reports present the results of the 2013 Community Summer Study of the
APS Division of Particles and Fields ("Snowmass 2013") on the future program of
particle physics in the U.S. Chapter 2, on the Intensity Frontier, discusses
the program of research with high-intensity beams and rare processes. This area
includes experiments on neutrinos, proton decay, charged-lepton and quark weak
interactions, atomic and nuclear probes of fundamental symmetries, and searches
for new, light, weakly-interacting particles.


title: Exploring Two-Field Inflation in the Wess-Zumino Model

abstract:
  We explore inflation via the effective potential of the minimal Wess-Zumino
model, considering both the real and imaginary components of the complex field.
Using transport techniques, we calculate the full allowed range of $n_s$, $r$
and $f_{\rm NL}$ for different choices of the single free parameter, $v$, and
present the probability distribution of these signatures given a simple choice
for the prior distribution of initial conditions. Our work provides a case
study of multi-field inflation in a simple but realistic setting, with
important lessons that are likely to apply more generally. For example, we find
that there are initial conditions consistent with observations of $n_s$ and $r$
for values of $v$ that would be excluded if only evolutions in the real field
direction were to be considered, and that these may yield enhanced values of
$f_{\rm NL}$. Moreover, we find that initial conditions fixed at high energy
density, where the potential is close to quartic in form, can still lead to
evolutions in a concave region of the potential during the observable number of
e-folds, as preferred by present data. The Wess-Zumino model therefore provides
an illustration that multi-field dynamics must be taken into account when
seeking to understand fully the phenomenology of such models of inflation.


title: HerMES: Spectral Energy Distributions of Submillimeter Galaxies at z >4

abstract:
  We present a study of the infrared properties for a sample of seven
spectroscopically confirmed submillimeter galaxies at $z>$4.0. By combining
ground-based near-infrared, Spitzer IRAC and MIPS, Herschel SPIRE, and
ground-based submillimeter/millimeter photometry, we construct their Spectral
Energy Distributions (SED) and a composite model to fit the SEDs. The model
includes a stellar emission component at $\lambda_{\rm rest} <$ 3.5$ \mu$m; a
hot dust component peaking at $\lambda_{rest} \sim$ 5$\,\mu$m; and cold dust
component which becomes significant for $\lambda_{\rm rest} >$ 50$\,\mu$m. Six
objects in the sample are detected at 250 and 350$ \mu$m. The dust temperatures
for the sources in this sample are in the range of 40$-$80 K, and their $L_{\rm
FIR}$ $\sim$ 10$^{13}$ L$_{\odot}$ qualifies them as Hyper$-$Luminous Infrared
Galaxies (HyperLIRGs). The mean FIR-radio index for this sample is around $< q
> = 2.2$ indicating no radio excess in their radio emission. Most sources in
the sample have 24$ \mu$m detections corresponding to a rest-frame 4.5$ \mu$m
luminosity of Log$_{10}$(L$_{4.5}$ / L$_{\odot}$) = 11 $\sim$ 11.5. Their
L$_{\rm 4.5}$/$L_{\rm FIR}$ ratios are very similar to those of starburst
dominated submillimeter galaxies at $z \sim$ 2. The $L_{\rm CO}-L_{\rm FIR}$
relation for this sample is consistent with that determined for local ULIRGs
and SMGs at $z \sim$ 2. We conclude that submillimeter galaxies at $z >$ 4 are
hotter and more luminous in the FIR, but otherwise very similar to those at $z
\sim$ 2. None of these sources show any sign of the strong QSO phase being
triggered.


title:
Strichartz estimates for Schr\"odinger equations on irrational tori in
  two and three dimensions

abstract:
  In this paper, we prove new multilinear Strichartz estimates, which are
obtained by using techniques of Bourgain. These estimates lead to new critical
well-posedness results for the nonlinear Schr\"odinger equation on irrational
tori in two and three dimensions with small initial data. In three dimensions,
this includes the energy critical case. This extends recent work of
Guo-Oh-Wang.


title:
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 3:
  Energy Frontier

abstract:
  These reports present the results of the 2013 Community Summer Study of the
APS Division of Particles and Fields ("Snowmass 2013") on the future program of
particle physics in the U.S. Chapter 3, on the Energy Frontier, discusses the
program of research with high-energy colliders. This area includes experiments
on the Higgs boson, the electroweak and strong interactions, and the top quark.
It also encompasses direct searches for new particles and interactions at high
energy.


title: Performance Evaluation of Two-Hop Wireless Link under Nakagami-m Fading

abstract:
  Now-a-days, intense research is going on two-hop wireless link under
different fading conditions with its remedial measures. In this paper work, a
two-hop link under three different conditions is considered: (i) MIMO on both
hops, (ii) MISO in first hop and SIMO in second hop and finally (iii) SIMO in
first hop and MISO in second hop. The three models used here give the
flexibility of using STBC (Space Time Block Coding) and combining scheme on any
of the source to relay (S- R) and relay to destination (R-D) link. Even
incorporation of Transmitting Antenna Selection (TAS) is possible on any link.
Here, the variation of SER (Symbol Error Rate) is determined against mean SNR
(Signal-to-Noise Ratio) of R-D link for three different modulation schemes:
BPSK, 8-PSK and 16-PSK, taking the number of antennas and SNR of S-R link as
parameters under Nakagami -m fading condition.


title: Maximizing Energy-Efficiency in Multi-Relay OFDMA Cellular Networks

abstract:
  This contribution presents a method of obtaining the optimal power and
subcarrier allocations that maximize the energy-efficiency (EE) of a
multi-user, multi-relay, orthogonal frequency division multiple access (OFDMA)
cellular network. Initially, the objective function (OF) is formulated as the
ratio of the spectral-efficiency (SE) over the power consumption of the
network. This OF is shown to be quasi-concave, thus Dinkelbach's method can be
employed for solving it as a series of parameterized concave problems. We
characterize the performance of the aforementioned method by comparing the
optimal solutions obtained to those found using an exhaustive search.
Additionally, we explore the relationship between the achievable SE and EE in
the cellular network upon increasing the number of active users. In general,
increasing the number of users supported by the system benefits both the SE and
EE, and higher SE values may be obtained at the cost of EE, when an increased
power may be allocated.


title:
New Lower Bound for the Optimal Ball Packing Density in Hyperbolic
  4-space

abstract:
  In this paper we consider ball packings in $4$-dimensional hyperbolic space.
We show that it is possible to exceed the conjectured $4$-dimensional
realizable packing density upper bound due to L. Fejes T\'oth (Regular Figures,
1964). We give seven examples of horoball packing configurations that yield
higher densities of $0.71644896\dots$, where horoballs are centered at ideal
vertices of certain Coxeter simplices, and are invariant under the actions of
their respective Coxeter groups.


title:
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 4:
  Cosmic Frontier

abstract:
  These reports present the results of the 2013 Community Summer Study of the
APS Division of Particles and Fields ("Snowmass 2013") on the future program of
particle physics in the U.S. Chapter 4, on the Cosmic Frontier, discusses the
program of research relevant to cosmology and the early universe. This area
includes the study of dark matter and the search for its particle nature, the
study of dark energy and inflation, and cosmic probes of fundamental
symmetries.

categories: hep-ex astro-ph.CO astro-ph.HE hep-ph hep-th


title:
Physical ageing and new representations of some Lie algebras of local
  scale-invariance

abstract:
  Indecomposable but reducible representations of several Lie algebras of local
scale-transformations, including the Schr\"odinger and conformal Galilean
algebras, and some of their applications in physical ageing are reviewed. The
physical requirement of the decay of co-variant two-point functions for large
distances is related to analyticity properties in the coordinates dual to the
physical masses or rapidities.

categories: hep-th cond-mat.stat-mech math-ph math.MP


title:
Efficient Image Encryption and Decryption Using Discrete Wavelet
  Transform and Fractional Fourier Transform

abstract:
  Fractional Fourier transform and chaos functions play a key role in many of
encryption-decryption algorithms. In this work performance of image
encryption-decryption algorithms is quantified and compared using the
computation time i.e. the time consumption of encryption-decryption process and
resemblance of input image to the restored image, quantified by MSE. This work
proposes an improvement in computation-time of image encryptiondecryption
algorithms by utilizing image compression properties of the 2-dimensional
Discrete Wavelet Transform (DWT2). Initially, computation complexity of the
algorithms is evaluated and compared with that of existing algorithms. This
analysis claims the proposed algorithms to be nearly 8 times faster than the
existing algorithms. Further, simulations are performed using MATLAB7.7 to
quantify performance of existing algorithms and the proposed algorithms using
MSE and computation time. The results obtained in these simulations prove that
for the proposed algorithms MSE between restored and original images is lesser
than that of existing algorithms thereby maintaining the robustness of the
existing algorithms. These algorithms are found sensitive to a variation of
1x10-1 in the fractional orders used in encryption-decryption process.


title:
Holographic thermalization with Lifshitz scaling and hyperscaling
  violation

abstract:
  A Vaidya type geometry describing gravitation collapse in asymptotically
Lifshitz spacetime with hyperscaling violation provides a simple holographic
model for thermalization near a quantum critical point with non-trivial dynamic
and hyperscaling violation exponents. The allowed parameter regions are
constrained by requiring that the matter energy momentum tensor satisfies the
null energy condition. We present a combination of analytic and numerical
results on the time evolution of holographic entanglement entropy in such
backgrounds for different shaped boundary regions and study various scaling
regimes, generalizing previous work by Liu and Suh.


title:
Magnetization, magnetostriction, and their relationship in Invar
  Fe$_{1-x}A_{x}$ ($A={\rm Pt},{\rm Ni}$)

abstract:
  A method is proposed for investigating the spontaneous magnetization, the
spontaneous volume magnetostriction, and their relationship in disordered
face-centered-cubic Fe$_{0.72}$Pt$_{0.28}$ and Fe$_{0.65}$Ni$_{0.35}$ in the
temperature interval $0 \leq T/T_{\rm C} < 1$. It relies on the disordered
local moment formalism and the observation that the reduced magnetization in
each of the investigated materials is accurately described by an equation of
the form $M(T)/M(0) = [ 1 -s (T/T_{\rm C})^{3/2}- (1-s)(T/T_{\rm C})^{p}
]^{q}$. The present approach yields interesting results. The alloys at zero
Kelvin share several physical properties: the volume in a partially disordered
local moment state shrinks as the fraction of Fe moments which point down
increases in the interval $0 < x^{{\rm Fe}\downarrow} < 1/2$, following closely
$V(0) - 4 [V(0)-V(1/2)] x^{{\rm Fe}\downarrow} (1-x^{{\rm Fe}\downarrow})$,
while the magnetization collapses, following closely $M(0) - 2 M(0) x^{{\rm
Fe}\downarrow}$; the volume in the homogeneous ferromagnetic state greatly
exceeds that in the disordered local moment state; $x^{{\rm Fe}\downarrow}(0)$
is close to zero. These common properties can account for a variety of
intriguing phenomena displayed by both alloys, including the anomaly in the
magnetostriction at zero Kelvin and, more surprisingly perhaps, the scaling
between the reduced magnetostriction and the reduced magnetization squared
below the Curie temperature. However, the thermal evolution of the fraction of
Fe moments which point down depends strongly on the alloy under consideration.
This, in turn, can explain the observed marked difference in the temperature
dependence of the reduced magnetization between the two alloys.


title: Interpolation between Hilbert spaces

abstract:
  This note comprises a synthesis of certain results in the theory of exact
interpolation between Hilbert spaces. In particular, we examine various
characterizations of interpolation spaces and their relations to a number of
results in operator-theory and in function-theory.


title:
Selection and Mid-infrared Spectroscopy of Ultraluminous Star-Forming
  Galaxies at z~2

abstract:
  Starting from a sample of 24 \micron\ sources in the Extended Groth Strip, we
use 3.6 to 8 \micron\ color criteria to select ultraluminous infrared galaxies
(ULIRGs) at $z\sim2$. Spectroscopy from 20-38 \micron\ of 14 objects verifies
their nature and gives their redshifts. Multi-wavelength data for these objects
imply stellar masses ${>}10^{11}$ \Msun\ and star formation rates $\ge$410
\Msun yr$^{-1}$. Four objects of this sample observed at 1.6 \micron\
(rest-frame visible) with {\it HST}/WFC3 show diverse morphologies, suggesting
that multiple formation processes create ULIRGs. Four of the 14 objects show
signs of active galactic nuclei, but the luminosity appears to be dominated by
star formation in all cases.


title: PageRank for evolving link structures

abstract:
  In this article we will look at the PageRank algorithm used as part of the
ranking process of different Internet pages in search engines by for example
Google. This article has its main focus in the understanding of the behavior of
PageRank as the system dynamically changes either by contracting or expanding
such as when adding or subtracting nodes or links or groups of nodes or links.
In particular we will take a look at link structures consisting of a line of
nodes or a complete graph where every node links to all others.
  We will look at PageRank as the solution of a linear system of equations and
do our examination in both the ordinary normalized version of PageRank as well
as the non-normalized version found by solving the linear system. We will see
that it is possible to find explicit formulas for the PageRank in some simple
link structures and using these formulas take a more in-depth look at the
behavior of the ranking as the system changes.


title: Multi-Time Formulation of Pair Creation

abstract:
  In a recent work [8], we have described a formulation of a model quantum
field theory in terms of a multi-time wave function and proposed a suitable
system of multi-time Schroedinger equations governing the evolution of that
wave function. Here, we provide further evidence that multi-time wave functions
provide a viable formulation of relevant quantum field theories by describing a
multi-time formulation, analogous to the one in [8], of another model quantum
field theory. This model involves three species of particles, say x-particles,
anti-x-particles, and y-particles, and postulates that a y-particle can decay
into a pair consisting of an x and an anti-x particle, and that an x-anti-x
pair, when they meet, annihilate each other creating a y-particle.
(Alternatively, the model can also be interpreted as representing beta decay.)
The wave function is a multi-time version of a time-dependent state vector in
Fock space (or rather, the appropriate product of Fock spaces) in the
particle-position representation. We write down multi-time Schroedinger
equations and verify that they are consistent, provided that an even number of
the three particle species involved are fermionic.


title:
Hartree approximation in curved spacetimes revisited II: The
  semiclassical Einstein equations and de Sitter self-consistent solutions

abstract:
  We consider the semiclassical Einstein equations (SEE) in the presence of a
quantum scalar field with self-interaction $\lambda\phi^4$. Working in the
Hartree truncation of the two-particle irreducible (2PI) effective action, we
compute the vacuum expectation value of the energy-momentum tensor of the
scalar field, which act as a source of the SEE. We obtain the renormalized SEE
by implementing a consistent renormalization procedure. We apply our results to
find self-consistent de Sitter solutions to the SEE in situations with or
without spontaneous breaking of the $Z_2$-symmetry.


title: On order-bounded subsets of locally solid Riesz spaces

abstract:
  In a topological Riesz space there are two types of bounded subsets: order
bounded subsets and topologically bounded subsets. It is natural to ask (1)
whether an order bounded subset is topologically bounded and (2) whether a
topologically bounded subset is order bounded. A classical result gives a
partial answer to (1) by saying that an order bounded subset of a locally solid
Riesz space is topologically bounded. This paper attempts to further
investigate these two questions. In particular, we show that (i) there exists a
non-locally solid topological Riesz space in which every order bounded subset
is topologically bounded; (ii) if a topological Riesz space is not locally
solid, an order bounded subset need not be topologically bounded; (iii) a
topologically bounded subset need not be order bounded even in a locally
convex-solid Riesz space. Next, we show that (iv) if a locally solid Riesz
space has an order bounded topological neighborhood of zero, then every
topologically bounded subset is order bounded; (v) however, a locally
convex-solid Riesz space may not possess an order bounded topological
neighborhood of zero even if every topologically bounded subset is order
bounded; (vi) a pseudometrizable locally solid Riesz space need not have an
order bounded topological neighborhood of zero. In addition, we give some
results about the relationship between order bounded subsets and positive
homogeneous operators.


title:
Star Cluster Formation in Turbulent, Magnetized Dense Clumps with
  Radiative and Outflow Feedback

abstract:
  We present three Orion simulations of star cluster formation in a 1000 Msun,
turbulent molecular cloud clump, including the effects of radiative transfer,
protostellar outflows, and magnetic fields. Our simulations all use
self-consistent turbulent initial conditions and vary the mean mass-to-flux
ratio relative to the critical value over 2, 10, and infinity to gauge the
influence of magnetic fields on star cluster formation. We find, in good
agreement with previous studies, that magnetic fields of typically observed
strengths lower the star formation rate by a factor of 2.4 and reduce the
amount of fragmentation by a factor of 2 relative to the zero-field case. We
also find that the field increases the characteristic sink particle mass, again
by a factor of 2.4. The magnetic field also increases the degree of clustering
in our simulations, such that the maximum stellar densities in the strong field
case are higher than the others by again a factor of 2. This clustering tends
to encourage the formation of multiple systems, which are more common in the
rad-MHD runs than the rad-hydro run. The companion frequency in our simulations
is consistent with observations of multiplicity in Class I sources,
particularly for the strong field case. Finally, we find evidence of primordial
mass segregation in our simulations reminiscent of that observed in star
clusters like the Orion Nebula Cluster.


title:
Polarization as a novel architecture to boost the classical mismatched
  capacity of B-DMCs

abstract:
  We show that the mismatched capacity of binary discrete memoryless channels
can be improved by channel combining and splitting via Ar{\i}kan's polar
transformations. We also show that the improvement is possible even if the
transformed channels are decoded with a mismatched polar decoder.


title:
An adaptive Simulated Annealing-based satellite observation scheduling
  method combined with a dynamic task clustering strategy

abstract:
  Efficient scheduling is of great significance to rationally make use of
scarce satellite resources. Task clustering has been demonstrated to realize an
effective strategy to improve the efficiency of satellite scheduling. However,
the previous task clustering strategy is static. That is, it is integrated into
the scheduling in a two-phase manner rather than in a dynamic fashion, without
expressing its full potential in improving the satellite scheduling
performance. In this study, we present an adaptive Simulated Annealing based
scheduling algorithm aggregated with a dynamic task clustering strategy (or
ASA-DTC for short) for satellite observation scheduling problems (SOSPs).
First, we develop a formal model for the scheduling of Earth observing
satellites. Second, we analyze the related constraints involved in the
observation task clustering process. Thirdly, we detail an implementation of
the dynamic task clustering strategy and the adaptive Simulated Annealing
algorithm. The adaptive Simulated Annealing algorithm is efficient, with the
endowment of some sophisticated mechanisms, i.e. adaptive temperature control,
tabu-list based revisiting avoidance mechanism, and intelligent combination of
neighborhood structures. Finally, we report on experimental simulation studies
to demonstrate the competitive performance of ASA-DTC. Moreover, we show that
ASA-DTC is especially effective when SOSPs contain a large number of targets or
these targets are densely distributed in a certain area.


title:
Electronic and Optical Properties of [110]-Tilted InAs/GaAs Quantum Dot
  Stacks

abstract:
  Multi-million atom simulations are performed to study stacking-angle
($\theta$) dependent strain profiles, electronic structure, and
polarization-resolved optical modes from [110]-tilted quantum dot stacks
(QDSs). Our calculations reveal highly asymmetrical biaxial strain
distributions for the tilted QDSs that strongly influence the confinements of
hole wave functions and thereby control the polarization response. The
calculated values of degree of polarizations, in good agreement with the
available experimental data, predict a unique property of the tilted QDSs that
the isotropic polarization response can be realized from both [110] and [-110]
cleaved-edges $-$ a feature inaccessible from the conventional [001]-QDSs.
Detailed investigations of polar plots further establish that tilting the QDSs
provides an additional knob to fine tune their polarization properties.


title:
Performance Impact of Lock-Free Algorithms on Multicore Communication
  APIs

abstract:
  Data race conditions in multi-tasking software applications are prevented by
serializing access to shared memory resources, ensuring data consistency and
deterministic behavior. Traditionally tasks acquire and release locks to
synchronize operations on shared memory. Unfortunately, lock management can add
significant processing overhead especially for multicore deployments where
tasks on different cores convoy in queues waiting to acquire a lock.
Implementing more than one lock introduces the risk of deadlock and using
spinlocks constrains which cores a task can run on. The better alternative is
to eliminate locks and validate that real-time properties are met, which is not
directly considered in many embedded applications. Removing the locks is
non-trivial and packaging lock-free algorithms for developers reduces the
possibility of concurrency defects. This paper details how a multicore
communication API implementation is enhanced to support lock-free messaging and
the impact this has on data exchange latency between tasks. Throughput and
latency are compared on Windows and Linux between lock-based and lock-free
implementations for data exchange of messages, packets, and scalars. A model of
the lock-free exchange predicts performance at the system architecture level
and provides a stop criterion for the refactoring. The results show that
migration from single to multicore hardware architectures degrades lock-based
performance, and increases lock-free performance.


title: Toward GIT stability of syzygies of canonical curves

abstract:
  We introduce the problem of GIT stability for syzygy points of canonical
curves with a view toward a GIT construction of the canonical model of the
moduli space of stable curves. As the first step in this direction, we prove
semi-stability of the first syzygy point for a general canonical curve of odd
genus.


title: e-commerce business models in the context of web3.0 paradigm

abstract:
  Web 3.0 promises to have a significant effect in users and businesses. It
will change how people work and play, how companies use information to market
and sell their products, as well as operate their businesses. The basic shift
occurring in Web 3.0 is from information-centric to knowledge-centric patterns
of computing. Web 3.0 will enable people and machines to connect, evolve, share
and use knowledge on an unprecedented scale and in new ways that make our
experience of the Internet better. Additionally, semantic technologies have the
potential to drive significant improvements in capabilities and life cycle
economics through cost reductions, improved efficiencies, enhanced
effectiveness, and new functionalities that were not possible or economically
feasible before. In this paper we look to the semantic web and Web 3.0
technologies as enablers for the creation of value and appearance of new
business models. For that, we analyze the role and impact of Web 3.0 in
business and we identify nine potential business models, based in direct and
undirected revenue sources, which have emerged with the appearance of semantic
web technologies.


title: Non-circular features in Saturn's D ring: D68

abstract:
  D68 is a narrow ringlet located only 67,627 km (1.12 planetary radii) from
Saturn's spin axis. Images of this ringlet obtained by the Cassini spacecraft
reveal that this ringlet exhibits persistent longitudinal brightness variations
and a substantial eccentricity (ae=25+/-1 km). By comparing observations made
at different times, we confirm that the brightness variations revolve around
the planet at approximately the local orbital rate (1751.6 degrees/day), and
that the ringlet's pericenter precesses at 38.243+/-0.008 degrees/day,
consistent with the expected apsidal precession rate at this location due to
Saturn's higher-order gravitational harmonics. Surprisingly, we also find that
the ringlet's semi-major axis appears to be decreasing with time at a rate of
2.4+/-0.4 km/year between 2005 and 2013. A closer look at these measurements,
along with a consideration of earlier Voyager observations of this same
ringlet, suggests that the mean radius of D68 moves back and forth, perhaps
with a period of around 15 Earth years or about half a Saturn year. These
observations could place important constraints on both the ringlet's local
dynamical environment and the planet's gravitational field.


title: Isomonodromic tau-functions from Liouville conformal blocks

abstract:
  The goal of this note is to show that the Riemann-Hilbert problem to find
multivalued analytic functions with $SL(2,\mathbb{C})$-valued monodromy on
Riemann surfaces of genus zero with $n$ punctures can be solved by taking
suitable linear combinations of the conformal blocks of Liouville theory at
$c=1$. This implies a similar representation for the isomonodromic
tau-function. In the case $n=4$ we thereby get a proof of the relation between
tau-functions and conformal blocks discovered in \cite{GIL}. We briefly discuss
a possible application of our results to the study of relations between certain
$\mathcal{N}=2$ supersymmetric gauge theories and conformal field theory.


title:
Electron correlation and magnetism at the LaAlO$_3$/SrTiO$_3$ interface:
  A DFT+DMFT investigation

abstract:
  We shed light on the interplay between structure and many-body effects
relevant for itinerant ferromagnetism in LaAlO$_3$/SrTiO$_3$ heterostructures.
The realistic correlated electronic structure is studied by means of the
(spin-polarized) charge self-consistent combination of density functional
theory (DFT) with dynamical mean-field theory (DMFT) beyond the realm of static
correlation effects. Though many-body behavior is also active in the
defect-free interface, a ferromagnetic instability occurs only with oxygen
vacancies. A minimal Ti two-orbital $e_g$-$t_{2g}$ description for the
correlated subspace is derived. Magnetic order affected by quantum fluctuations
builds up from effective double exchange between nearly-localized $e_g$ and
mobile $xy$ electrons.


title:
Bringing Reference Groups Back: Agent-based Modeling of the Spiral of
  Silence

abstract:
  The purpose of this study is threefold: first, to bring reference groups back
into the framework of spiral of silence (SOS) by proposing an extended
framework of dual opinion climate; second, to investigate the boundary
conditions of SOS; third, to identify the characteristics of SOS in terms of
spatial variation and temporal evolution. Modeling SOS with agent-based models,
the findings suggest (1) there is no guarantee of SOS with reference groups
being brought back; (2) Stable existence of SOS is contingent upon the
comparative strength of mass media over reference groups; (3) SOS is
size-dependent upon reference groups and the population; (4) the growth rate of
SOS decreases over time. Thus, this research presents an extension of the SOS
theory.


title: Magnetic flux concentrations from dynamo-generated fields

abstract:
  The mean-field theory of magnetized stellar convection gives rise to the two
possibility of distinct instabilities: the large-scale dynamo instability,
operating in the bulk of the convection zone, and a negative effective magnetic
pressure instability (NEMPI) operating in the strongly stratified surface
layers. The latter might be important in connection with magnetic spot
formation, but the growth rate of NEMPI is suppressed with increasing rotation
rates, although recent direct numerical simulations (DNS) have shown a
subsequent increase in the growth rate. We examine quantitatively whether this
increase in the growth rate of NEMPI can be explained by an alpha squared
mean-field dynamo, and whether both NEMPI and the dynamo instability can
operate at the same time. We use both DNS and mean-field simulations (MFS) to
solve the underlying equations numerically either with or without an imposed
horizontal field. We use the test-field method to compute relevant dynamo
coefficients. DNS show that magnetic flux concentrations are still possible up
to rotation rates above which the large-scale dynamo effect produces mean
magnetic fields. The resulting DNS growth rates are quantitatively well
reproduced with MFS. As expected, for weak or vanishing rotation, the growth
rate of NEMPI increases with increasing gravity, but there is a correction term
for strong gravity and large turbulent magnetic diffusivity. Magnetic flux
concentrations are still possible for rotation rates above which dynamo action
takes over. For the solar rotation rate, the corresponding turbulent turnover
time is about 5 hours, with dynamo action commencing in the layers beneath.


title: Face Verification Using Kernel Principle Component Analysis

abstract:
  In the beginning stage, face verification is done using easy method of
geometric algorithm models, but the verification route has now developed into a
scientific progress of complicated geometric representation and matching
process. In modern time the skill have enhanced face detection system into the
vigorous focal point. Researchers currently undergoing strong research on
finding face recognition system for wider area information taken under
hysterical elucidation dissimilarity. The proposed face recognition system
consists of a narrative exposition indiscreet preprocessing method, a hybrid
Fourier-based facial feature extraction and a score fusion scheme. We take in
conventional the face detection in unlike cheer up circumstances and at unusual
setting. Image processing, Image detection, Feature removal and Face detection
are the methods used for Face Verification System . This paper focuses mainly
on the issue of toughness to lighting variations. The proposed system has
obtained an average of verification rate on Two-Dimensional images under
different lightening conditions.


title: Trapping photons on the line: controllable dynamics of a quantum walk

abstract:
  We demonstrate a coined quantum walk over ten steps in a one-dimensional
network of linear optical elements. By applying single-point phase defects, the
translational symmetry of an ideal standard quantum walk is broken resulting in
localization effect in a quantum walk architecture. We furthermore investigate
how the level of phase due to single-point phase defects and coin settings
influence the strength of the localization signature.


title: Nonergodic Subdiffusion from Brownian Motion in an Inhomogeneous Medium

abstract:
  Nonergodicity observed in single-particle tracking experiments is usually
modeled by transient trapping rather than spatial disorder. We introduce models
of a particle diffusing in a medium consisting of regions with random sizes and
random diffusivities. The particle is never trapped, but rather performs
continuous Brownian motion with the local diffusion constant. Under simple
assumptions on the distribution of the sizes and diffusivities, we find that
the mean squared displacement displays subdiffusion due to non-ergodicity for
both annealed and quenched disorder. The model is formulated as a walk
continuous in both time and space, similar to the L\'{e}vy walk.


title:
Boundary conditions effects on the ground state of a two-electron atom
  in a vacuum cavity

abstract:
  The ground state properties of the two-electron atom with atomic number
$Z\geq 2$ in the spherical vacuum cavity with general boundary conditions of
"not going out" are studied. It is shown that for certain parameters of the
cavity such atom could either decay into the one-electron atom with the same
atomic number and an electron or be in stable state with the binding and
ionization energies several times bigger than the same energies of the free
atom. By analogy with the Wigner-Seitz model of metallic bonding, the
possibility of the existence of such effects on the lattice formed by the
vacuum cavities filled with the two-electron atoms of the same type is
discussed.


title:
Face Verification System based on Integral Normalized Gradient
  Image(INGI)

abstract:
  Character identification plays a vital role in the contemporary world of
Image processing. It can solve many composite problems and makes humans work
easier. An instance is Handwritten Character detection. Handwritten recognition
is not a novel expertise, but it has not gained community notice until Now. The
eventual aim of designing Handwritten Character recognition structure with an
accurateness rate of 100% is pretty illusionary. Tamil Handwritten Character
recognition system uses the Neural Networks to distinguish them. Neural Network
and structural characteristics are used to instruct and recognize written
characters. After training and testing the exactness rate reached 99%. This
correctness rate is extremely high. In this paper we are exploring image
processing through the Hilditch algorithm foundation and structural
characteristics of a character in the image. And we recognized some character
of the Tamil language, and we are trying to identify all the character of Tamil
In our future works.


title: A Motivation Model of Peer Assessment in Programming Language Learning

abstract:
  Peer assessment is an efficient and effective learning assessment method that
has been used widely in diverse fields in higher education. Despite its many
benefits, a fundamental problem in peer assessment is that participants lack
the motivation to assess others' work faithfully and fairly. Non-consensus is a
common challenge that makes the reliability of peer assessment a primary
concern in practices. This research proposes a motivation model that uses
review deviation and radicalization to identify non-consensus in peer
assessment. The proposed model is implemented as a software module in a peer
code review system called EduPCR4. EduPCR4 is able to monitor this measure and
trigger teacher's arbitration when it detects possible non-consensus. An
empirical study conducted in a university-level C programming course showed
that the proposed model and its implementation helped to improve the peer
assessment practices in many aspects.


title:
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 6:
  Accelerator Capabilities

abstract:
  These reports present the results of the 2013 Community Summer Study of the
APS Division of Particles and Fields ("Snowmass 2013") on the future program of
particle physics in the U.S. Chapter 6, on Accelerator Capabilities, discusses
the future progress of accelerator technology, including issues for high-energy
hadron and lepton colliders, high-intensity beams, electron-ion colliders, and
necessary R&D for future accelerator technologies.


title:
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 7:
  Underground Laboratory Capabilities

abstract:
  These reports present the results of the 2013 Community Summer Study of the
APS Division of Particles and Fields ("Snowmass 2013") on the future program of
particle physics in the U.S. Chapter 7, on Underground Laboratory Capabilities,
discusses the prospects and requirements for large underground experiments such
as those for neutrino physics, proton decay, and dark matter.


title:
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 8:
  Instrumentation Frontier

abstract:
  These reports present the results of the 2013 Community Summer Study of the
APS Division of Particles and Fields ("Snowmass 2013") on the future program of
particle physics in the U.S. Chapter 8, on the Instrumentation Frontier,
discusses the instrumentation needs of future experiments in the Energy,
Intensity, and Cosmic Frontiers, promising new technologies for particle
physics research, and issues of gathering resources for long-term research in
this area.


title:
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 9:
  Computing

abstract:
  These reports present the results of the 2013 Community Summer Study of the
APS Division of Particles and Fields ("Snowmass 2013") on the future program of
particle physics in the U.S. Chapter 9, on Computing, discusses the computing
challenges for future experiments in the Energy, Intensity, and Cosmic
Frontiers, for accelerator science, and for particle theory, as well as
structural issues in supporting the intense uses of computing required in all
areas of particle physics.

categories: hep-ex hep-lat hep-ph physics.acc-ph physics.ins-det


title:
Comparative study of Authorship Identification Techniques for Cyber
  Forensics Analysis

abstract:
  Authorship Identification techniques are used to identify the most
appropriate author from group of potential suspects of online messages and find
evidences to support the conclusion. Cybercriminals make misuse of online
communication for sending blackmail or a spam email and then attempt to hide
their true identities to void detection.Authorship Identification of online
messages is the contemporary research issue for identity tracing in cyber
forensics. This is highly interdisciplinary area as it takes advantage of
machine learning, information retrieval, and natural language processing. In
this paper, a study of recent techniques and automated approaches to
attributing authorship of online messages is presented. The focus of this
review study is to summarize all existing authorship identification techniques
used in literature to identify authors of online messages. Also it discusses
evaluation criteria and parameters for authorship attribution studies and list
open questions that will attract future work in this area.


title:
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter
  10: Communication, Education, and Outreach

abstract:
  These reports present the results of the 2013 Community Summer Study of the
APS Division of Particles and Fields ("Snowmass 2013") on the future program of
particle physics in the U.S. Chapter 10, on Communication, Education, and
Outreach, discusses the resources and issues for the communication of
information about particle physics to teachers and students, to scientists in
other fields, to policy makers, and to the general public.

categories: hep-ex hep-lat hep-ph hep-th physics.soc-ph


title: Analysis and Diversion of Duqu's Driver

abstract:
  The propagation techniques and the payload of Duqu have been closely studied
over the past year and it has been said that Duqu shared functionalities with
Stuxnet. We focused on the driver used by Duqu during the infection, our
contribution consists in reverse-engineering the driver: we rebuilt its source
code and analyzed the mechanisms it uses to execute the payload while avoiding
detection. Then we diverted the driver into a defensive version capable of
detecting injections in Windows binaries, thus preventing further attacks. We
specifically show how Duqu's modified driver would have detected Duqu.


title: A Robust Password-Based Multi-Server Authentication Scheme

abstract:
  In 2013, Tsai et al. cryptanalyzed Yeh et al. scheme and shown that Yeh et
al., scheme is vulnerable to various cryptographic attacks and proposed an
improved scheme. In this poster we will show that Tsai et al., scheme is also
vulnerable to undetectable online password guessing attack, on success of the
attack, the adversary can perform all major cryptographic attacks. As apart of
our contribution, we have proposed an improved scheme which overcomes the
defects in Tsai et al. and Yeh et al. schemes.


title: Identifying Bengali Multiword Expressions using Semantic Clustering

abstract:
  One of the key issues in both natural language understanding and generation
is the appropriate processing of Multiword Expressions (MWEs). MWEs pose a huge
problem to the precise language processing due to their idiosyncratic nature
and diversity in lexical, syntactical and semantic properties. The semantics of
a MWE cannot be expressed after combining the semantics of its constituents.
Therefore, the formalism of semantic clustering is often viewed as an
instrument for extracting MWEs especially for resource constraint languages
like Bengali. The present semantic clustering approach contributes to locate
clusters of the synonymous noun tokens present in the document. These clusters
in turn help measure the similarity between the constituent words of a
potentially candidate phrase using a vector space model and judge the
suitability of this phrase to be a MWE. In this experiment, we apply the
semantic clustering approach for noun-noun bigram MWEs, though it can be
extended to any types of MWEs. In parallel, the well known statistical models,
namely Point-wise Mutual Information (PMI), Log Likelihood Ratio (LLR),
Significance function are also employed to extract MWEs from the Bengali
corpus. The comparative evaluation shows that the semantic clustering approach
outperforms all other competing statistical models. As a by-product of this
experiment, we have started developing a standard lexicon in Bengali that
serves as a productive Bengali linguistic thesaurus.


title: Secrecy Transmission Capacity in Noisy Wireless Ad Hoc Networks

abstract:
  This paper considers the transmission of confidential messages over noisy
wireless ad hoc networks, where both background noise and interference from
concurrent transmitters affect the received signals. For the random networks
where the legitimate nodes and the eavesdroppers are distributed as Poisson
point processes, we study the secrecy transmission capacity (STC), as well as
the connection outage probability and secrecy outage probability, based on the
physical layer security. We first consider the basic fixed transmission
distance model, and establish a theoretical model of the STC. We then extend
the above results to a more realistic random distance transmission model,
namely nearest receiver transmission. Finally, extensive simulation and
numerical results are provided to validate the efficiency of our theoretical
results and illustrate how the STC is affected by noise, connection and secrecy
outage probabilities, transmitter and eavesdropper densities, and other system
parameters. Remarkably, our results reveal that a proper amount of noise is
helpful to the secrecy transmission capacity.


title: Iterative Universal Hash Function Generator for Minhashing

abstract:
  Minhashing is a technique used to estimate the Jaccard Index between two sets
by exploiting the probability of collision in a random permutation. In order to
speed up the computation, a random permutation can be approximated by using an
universal hash function such as the $h_{a,b}$ function proposed by Carter and
Wegman. A better estimate of the Jaccard Index can be achieved by using many of
these hash functions, created at random. In this paper a new iterative
procedure to generate a set of $h_{a,b}$ functions is devised that eliminates
the need for a list of random values and avoid the multiplication operation
during the calculation. The properties of the generated hash functions remains
that of an universal hash function family. This is possible due to the random
nature of features occurrence on sparse datasets. Results show that the
uniformity of hashing the features is maintaned while obtaining a speed up of
up to $1.38$ compared to the traditional approach.


title:
Software Architecture and Subclassing Technique for Semiconductor
  Manufacturing Machines

abstract:
  This paper proposed software architecture for operating an automatic
semiconductor manufacturing machine. Recent machines for semiconductor process
are required for high level of automation which are composed of motion control,
machine vision, data acquisition and networking. These functions are executed
through industrial equipments that are generally installed in a computer. The
equipments occupy a great part of system resource and generate a lot of
computation, so the software structure should be designed for efficiency. The
proposed architecture is consisted of four layers and virtual equipments(VEs).
The VEs are made by subclassing the physical equipments(PEs) and the layers are
coded into thread which updates the status of VEs. Subroutines in a program
refer to the pointer of VEs, and direct access to physical equipment are
prohibited. The number of access (NOA) to PEs in typical industrial application
was simulated for the unlimited access structure and the presented structure.
The result showed that the proposed structure was more efficient than typical
ones and irrespective of subroutines. This architecture was also applied to
design a machine operating software and performed automatic wafer dicing.


title:
Delegating Custom Object Detection Tasks to a Universal Classification
  System

abstract:
  In this paper, a concept of multipurpose object detection system, recently
introduced in our previous work, is clarified. The business aspect of this
method is transformation of a classifier into an object detector/locator via an
image grid. This is a universal framework for locating objects of interest
through classification. The framework standardizes and simplifies
implementation of custom systems by doing only a custom analysis of the
classification results on the image grid.


title: Brain Tumor Detection Based On Symmetry Information

abstract:
  Advances in computing technology have allowed researchers across many fields
of endeavor to collect and maintain vast amounts of observational statistical
data such as clinical data, biological patient data, data regarding access of
web sites, financial data, and the like. This paper addresses some of the
challenging issues on brain magnetic resonance (MR) image tumor segmentation
caused by the weak correlation between magnetic resonance imaging (MRI)
intensity and anatomical meaning. With the objective of utilizing more
meaningful information to improve brain tumor segmentation, an approach which
employs bilateral symmetry information as an additional feature for
segmentation is proposed. This is motivated by potential performance
improvement in the general automatic brain tumor segmentation systems which are
important for many medical and scientific applications


title:
The Probabilities of Orbital-Companion Models for Stellar Radial
  Velocity Data

abstract:
  The fully marginalized likelihood, or Bayesian evidence, is of great
importance in probabilistic data analysis, because it is involved in
calculating the posterior probability of a model or re-weighting a mixture of
models conditioned on data. It is, however, extremely challenging to compute.
This paper presents a geometric-path Monte Carlo method, inspired by
multi-canonical Monte Carlo to evaluate the fully marginalized likelihood. We
show that the algorithm is very fast and easy to implement and produces a
justified uncertainty estimate on the fully marginalized likelihood. The
algorithm performs efficiently on a trial problem and multi-companion model
fitting for radial velocity data. For the trial problem, the algorithm returns
the correct fully marginalized likelihood, and the estimated uncertainty is
also consistent with the standard deviation of results from multiple runs. We
apply the algorithm to the problem of fitting radial velocity data from HIP
88048 ($\nu$ Oph) and Gliese 581. We evaluate the fully marginalized likelihood
of 1, 2, 3, and 4-companion models given data from HIP 88048 and various
choices of prior distributions. We consider prior distributions with three
different minimum radial velocity amplitude $K_{\mathrm{min}}$. Under all three
priors, the 2-companion model has the largest marginalized likelihood, but the
detailed values depend strongly on $K_{\mathrm{min}}$. We also evaluate the
fully marginalized likelihood of 3, 4, 5, and 6-planet model given data from
Gliese 581 and find that the fully marginalized likelihood of the 5-planet
model is too close to that of the 6-planet model for us to confidently decide
between them.


title:
Image enhancement using fusion by wavelet transform and laplacian
  pyramid

abstract:
  The idea of combining multiple image modalities to provide a single, enhanced
image is well established different fusion methods have been proposed in
literature. This paper is based on image fusion using laplacian pyramid and
wavelet transform method. Images of same size are used for experimentation.
Images used for the experimentation are standard images and averaging filter is
used of equal weights in original images to burl. Performance of image fusion
technique is measured by mean square error, normalized absolute error and peak
signal to noise ratio. From the performance analysis it has been observed that
MSE is decreased in case of both the methods where as PSNR increased, NAE
decreased in case of laplacian pyramid where as constant for wavelet transform
method.


title: smart application for AMS using Face Recognition

abstract:
  Attendance Management System (AMS) can be made into smarter way by using face
recognition technique, where we use a CCTV camera to be fixed at the entry
point of a classroom, which automatically captures the image of the person and
checks the observed image with the face database using android enhanced smart
phone. It is typically used for two purposes. Firstly, marking attendance for
student by comparing the face images produced recently and secondly,
recognition of human who are strange to the environment i.e. an unauthorized
person For verification of image, a newly emerging trend 3D Face Recognition is
used which claims to provide more accuracy in matching the image databases and
has an ability to recognize a subject at different view angles.


title: Controlling Complexity in Part-of-Speech Induction

abstract:
  We consider the problem of fully unsupervised learning of grammatical
(part-of-speech) categories from unlabeled text. The standard
maximum-likelihood hidden Markov model for this task performs poorly, because
of its weak inductive bias and large model capacity. We address this problem by
refining the model and modifying the learning objective to control its capacity
via para- metric and non-parametric constraints. Our approach enforces
word-category association sparsity, adds morphological and orthographic
features, and eliminates hard-to-estimate parameters for rare words. We develop
an efficient learning algorithm that is not much more computationally intensive
than standard training. We also provide an open-source implementation of the
algorithm. Our experiments on five diverse languages (Bulgarian, Danish,
English, Portuguese, Spanish) achieve significant improvements compared with
previous methods for the same task.


title: Differenciated Bandwidth Allocation in P2P Layered Streaming

abstract:
  There is an increasing demand for P2P streaming in particular for layered
video. In this category of applications, the stream is composed of
hierarchically encoded sub-streams layers namely the base layer and
enhancements layers. We consider a scenario where the receiver peer uses the
pull-based approach to adjust the video quality level to their capability by
subscribing to different number of layers. We note that higher layers received
without their corresponding lower layers are considered as useless and cannot
be played, consequently the throughput of the system will drastically degrade.
To avoid this situation, we propose an economical model based on auction
mechanisms to optimize the allocation of sender peers' upload bandwidth. The
upstream peers organize auctions to "sell" theirs items (links' bandwidth)
according to bids submitted by the downstream peers taking into consideration
the peers priorities and the requested layers importance. The ultimate goal is
to satisfy the quality level requirement for each peer, while reducing the
overall streaming cost. Through theoretical study and performance evaluation we
show the effectiveness of our model in terms of users and network's utility.


title: Hardy-Sobolev Equations on Compact Riemannian Manifolds

abstract:
  Let (M,g) be a compact Riemannien Manifold of dimension n > 2, x_0 in M a fix
and singular point and s in (0,2). We let 2*(s) = 2(n-s)/(n-2) be the critical
Hardy-Sobolev exponent. we investigate the existence of positive distributional
solutions u in C^0(M) to the critical equation \Delta_g u + a(x) u =
u^{2*(s)-1}/ d_g(x,x_0)^s in M where \Delta_g := - div_g(\nabla) is the
Laplace-Beltrami operator, and d_g is the Riemannian distance on (M,g). Via a
minimization method in the spirit of Aubin, we prove existence in dimension n >
3 when the potential a is sufficiently below the scalar curvature at x_0. In
dimension n = 3, we use a global argument and we prove existence when the mass
of the linear operator \Delta_g + a is positive at x_0. As a byproduct of our
analysis, we compute the best first constant for the related Riemannian
Hardy-Sobolev inequality.


title:
Sequential Joint Spectrum Sensing and Channel Estimation for Dynamic
  Spectrum Access

abstract:
  Dynamic spectrum access under channel uncertainties is considered. With the
goal of maximizing the secondary user (SU) throughput subject to constraints on
the primary user (PU) outage probability we formulate a joint problem of
spectrum sensing and channel state estimation. The problem is cast into a
sequential framework since sensing time minimization is crucial for throughput
maximization. In the optimum solution, the sensing decision rule is coupled
with the channel estimator, making the separate treatment of the sensing and
channel estimation strictly suboptimal. Using such a joint structure for
spectrum sensing and channel estimation we propose a distributed (cooperative)
dynamic spectrum access scheme under statistical channel state information
(CSI). In the proposed scheme, the SUs report their sufficient statistics to a
fusion center (FC) via level-triggered sampling, a nonuniform sampling
technique that is known to be bandwidth-and-energy efficient. Then, the FC
makes a sequential spectrum sensing decision using local statistics and channel
estimates, and selects the SU with the best transmission opportunity. The
selected SU, using the sensing decision and its channel estimates, computes the
transmit power and starts data transmission. Simulation results demonstrate
that the proposed scheme significantly outperforms its conventional
counterparts, under the same PU outage constraints, in terms of the achievable
SU throughput.


title: Capacity Bounds for a Class of Diamond Networks

abstract:
  A class of diamond networks are studied where the broadcast component is
modelled by two independent bit-pipes. New upper and low bounds are derived on
the capacity which improve previous bounds. The upper bound is in the form of a
max-min problem, where the maximization is over a coding distribution and the
minimization is over an auxiliary channel. The proof technique generalizes
bounding techniques of Ozarow for the Gaussian multiple description problem
(1981), and Kang and Liu for the Gaussian diamond network (2011). The bounds
are evaluated for a Gaussian multiple access channel (MAC) and the binary adder
MAC, and the capacity is found for interesting ranges of the bit-pipe
capacities.


title:
Distributed Remote Vector Gaussian Source Coding with Covariance
  Distortion Constraints

abstract:
  In this paper, we consider a distributed remote source coding problem, where
a sequence of observations of source vectors is available at the encoder. The
problem is to specify the optimal rate for encoding the observations subject to
a covariance matrix distortion constraint and in the presence of side
information at the decoder. For this problem, we derive lower and upper bounds
on the rate-distortion function (RDF) for the Gaussian case, which in general
do not coincide. We then provide some cases, where the RDF can be derived
exactly. We also show that previous results on specific instances of this
problem can be generalized using our results. We finally show that if the
distortion measure is the mean squared error, or if it is replaced by a certain
mutual information constraint, the optimal rate can be derived from our main
result.


title:
The VIMOS Public Extragalactic Redshift Survey (VIPERS): A quiescent
  formation of massive red-sequence galaxies over the past 9 Gyr

abstract:
  We explore the evolution of the Colour-Magnitude Relation (CMR) and
Luminosity Function (LF) at 0.4<z<1.3 from the VIMOS Public Extragalactic
Redshift Survey (VIPERS) using ~45,000 galaxies with precise spectroscopic
redshifts down to i'_AB<22.5 over ~10.32 deg^2 in two fields. From z=0.5 to
z=1.3 the LF and CMR are well defined for different galaxy populations and
M^*_B evolves by ~1.04(1.09)+/-0.06(0.10) mag for the total (red) galaxy
sample. We compare different criteria for selecting early-type galaxies (ETGs):
(1) fixed cut in rest-frame (U-V) colours, (2) evolving cut in (U-V) colours,
(3) rest-frame (NUV-r')-(r'-K) colour selection, and (4) SED classification.
Regardless of the method we measure a consistent evolution of the red-sequence
(RS). Between 0.4<z<1.3 we find a moderate evolution of the RS intercept of
Delta(U-V)=0.28+/-0.14 mag, favouring exponentially declining star formation
(SF) histories with SF truncation at 1.7<=z<=2.3. Together with the rise in the
ETG number density by 0.64 dex since z=1, this suggests a rapid build-up of
massive galaxies (M>10^11 M_sun) and expeditious RS formation over a short
period of ~1.5 Gyr starting before z=1. This is supported by the detection of
ongoing SF in ETGs at 0.9<z<1.0, in contrast with the quiescent red stellar
populations of ETGs at 0.5<z<0.6. There is an increase in the observed CMR
scatter with redshift, two times larger than in galaxy clusters and at variance
with theoretical models. We discuss possible physical mechanisms that support
the observed evolution of the red galaxy population. Our findings point out
that massive galaxies have experienced a sharp SF quenching at z~1 with only
limited additional merging. In contrast, less-massive galaxies experience a mix
of SF truncation and minor mergers which build-up the low- and
intermediate-mass end of the CMR.


title:
Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the
  4He(e,e'pN) Triple-Coincidence Reaction

abstract:
  We studied simultaneously the 4He(e,e'p), 4He(e,e'pp), and 4He(e,e'pn)
reactions at Q^2=2 [GeV/c]2 and x_B>1, for a (e,e'p) missing-momentum range of
400 to 830 MeV/c. The knocked-out proton was detected in coincidence with a
proton or neutron recoiling almost back to back to the missing momentum,
leaving the residual A=2 system at low excitation energy. These data were used
to identify two-nucleon short-range correlated pairs and to deduce their
isospin structure as a function of missing momentum in a region where the
nucleon-nucleon force is expected to change from predominantly tensor to
repulsive. Neutron-proton pairs dominate the high-momentum tail of the nucleon
momentum distributions, but their abundance is reduced as the nucleon momentum
increases beyond ~500 MeV/c. The extracted fraction of proton-proton pairs is
small and almost independent of the missing momentum in the range we studied.
Our data are compared with ab-initio calculations of two-nucleon momentum
distributions in 4He.


title: Leibniz homology of Lie algebras as functor homology

abstract:
  We prove that Leibniz homology of Lie algebras can be described as functor
homology in the category of linear functors from a category associated to the
Lie operad.


title: The density of sets avoiding distance 1 in Euclidean space

abstract:
  We improve by an exponential factor the best known asymptotic upper bound for
the density of sets avoiding 1 in Euclidean space. This result is obtained by a
combination of an analytic bound that is an analogue of Lovasz theta number and
of a combinatorial argument involving finite subgraphs of the unit distance
graph. In turn, we straightforwardly obtain an asymptotic improvement for the
measurable chromatic number of Euclidean space. We also tighten previous
results for the dimensions between 4 and 24.


title: New type of anomaly in turbulence

abstract:
  The turbulent energy flux through scales, $\bar{\epsilon}$, remains constant
and non vanishing in the limit of zero viscosity, which results in the
fundamental anomaly of time irreversibility. It was considered straightforward
to deduce from this the Lagrangian velocity anomaly, $\left< d u^2/dt\right>=-4
\bar{\epsilon}$ at $t=0$, where $\vec{u}$ is the velocity difference of a pair
of particles, initially separated by a fixed distance. In this letter we
demonstrate that this derivation assumed first taking the limit $t \to 0$ and
then $\nu \to 0$, while the true anomaly requires taking viscosity to zero
first. For compressible turbulence we find that the limits $t \to 0$ and $\nu
\to 0$ do not commute and the Lagrangian anomaly is completely altered: $\left<
d u^2/dt\right>$ has different values forward and backward in time. We show
that this new anomaly is related to the particles entering/exiting shocks
forward/backward in time. For incompressible flows, on the other hand, we show
that the limits can be interchanged and the Lagrangian anomaly is still induced
by the flux law, apparently due to a homogeneous distribution of fluid
particles at all times.

categories: nlin.CD cond-mat.stat-mech hep-th physics.flu-dyn


title:
Discussion on the energy content of the galactic dark matter
  Bose-Einstein condensate halo in the Thomas-Fermi approximation

abstract:
  We show that the galactic dark matter halo, considered composed of an
axionlike particles Bose-Einstein condensate \cite{pir12} trapped by a
self-graviting potential \cite{boh07}, may be stable in the Thomas-Fermi
approximation since appropriate choices for the dark matter particle mass and
scattering length are made. The demonstration is performed by means of the
calculation of the potential, kinetic and self-interaction energy terms of a
galactic halo described by a Boehmer-Harko density profile. We discuss the
validity of the Thomas-Fermi approximation for the halo system, and show that
the kinetic energy contribution is indeed negligible.


title: Optimal Hardy-Sobolev Inequalities on Compact Riemannain Manifolds

abstract:
  Given a compact Riemannian Manifold (M,g) of dimension n > 2, a point x_0 in
M and s in (0,2). We let 2*(s) = 2(n-s)/(n-2) be the critical Hardy-Sobolev
exponent. The Hardy-Sobolev embedding yields the existence of A,B > 0 such that
(\int_M|u|^{2*(s)}dv_g)^{2/2*(s)} \leq A\int_M |\nabla u|_g^2 dv_g +B\int_M u^2
dv_g for all u in H_1^2(M). It has been proved that A\leq K(n,s) and that one
can take any value A > K(n,s) in in the above inequality where $K(n,s)$ is the
best possible constant in the Euclidean Hardy-Sobolev inequality. In the
present manuscript, we prove that one can also take A = K(n,s) in the above
inequality.


title:
Computation of the unipotent radical of the differential Galois group
  for a parameterized second-order linear differential equation

abstract:
  We propose a new method to compute the unipotent radical $R_u(H)$ of the
differential Galois group $H$ associated to a parameterized second-order
homogeneous linear differential equation of the form
\[\tfrac{\partial^2}{\partial x^2}Y-qY=0,\] where $q \in F(x)$ is a rational
function in $x$ with coefficients in a $\Pi$-field $F$ of characteristic zero,
and $\Pi$ is a commuting set of parametric derivations. The procedure developed
by Dreyfus reduces the computation of $R_u(H)$ to solving a creative
telescoping problem, whose effective solution requires the assumption that the
maximal reductive quotient $H / R_u(H)$ is a $\Pi$-constant linear differential
algebraic group. When this condition is not satisfied, we compute a new set of
parametric derivations $\Pi'$ such that the associated differential Galois
group $H'$ has the property that $H'/ R_u(H')$ is $\Pi'$-constant, and such
that $R_u(H)$ is defined by the same differential equations as $R_u(H')$. Thus
the computation of $R_u(H)$ is reduced to the effective computation of
$R_u(H')$. We expect that an elaboration of this method will be successful in
extending the applicability of some recent algorithms developed by Minchenko,
Ovchinnikov, and Singer to compute unipotent radicals for higher order
equations.