pinecone/core-2020-05-10-deduplication huggingface dataset:
Unified model of voltage/current mode control to predict saddle-node
  bifurcation

A unified model of voltage mode control (VMC) and current mode control (CMC)
is proposed to predict the saddle-node bifurcation (SNB). Exact SNB boundary
conditions are derived, and can be further simplified in various forms for
design purpose. Many approaches, including steady-state, sampled-data, average,
harmonic balance, and loop gain analyses are applied to predict SNB. Each
approach has its own merits and complement the other approaches.Comment: Submitted to International Journal of Circuit Theory and Applications
  on December 23, 2010; Manuscript ID: CTA-10-025
A Lensing Survey of X-ray Luminous Galaxy Clusters at Redshift z ~ 0.2:
  II: CFH12k Weak Lensing Analysis and Global Correlations

Aims: We present a wide-field multi-color survey of a homogeneous sample of
eleven clusters of galaxies for which we measure total masses and mass
distributions from weak lensing.
  Methods: The eleven clusters in our sample are all X-ray luminous and span a
narrow redshift range at z=0.21 +/- 0.04. The weak lensing analysis of the
sample is based on ground-based wide-field imaging obtained with the CFH12k
camera on CFHT. We use the methodology developed and applied previously on the
massive cluster Abell 1689. A Bayesian method, implemented in the Im2shape
software, is used to fit the shape parameters of the faint background galaxies
and to correct for PSF smearing. With the present data, shear profiles are
measured in all clusters out to at least 2 Mpc (more than 15arcmin from the
center) with high confidence. The radial shear profiles are fitted with
different parametric mass profiles and the virial mass M_200 is estimated for
each cluster and then compared to other physical properties.
  Results: Scaling relations between mass and optical luminosity indicate an
increase of the M/L ratio with luminosity and a L_X-M_200 relation scaling as
L_X \propto M_200^(0.83 +/- 0.11) while the normalization of the M_200 \propto
T_X^{3/2} relation is close to the one expected from hydrodynamical simulations
of cluster formation as well as previous X-ray analyses. We suggest that the
dispersion in the M_200-T_X and M_200-L_X relations reflects the different
merging and dynamical histories for clusters of similar X-ray luminosities and
intrinsic variations in their measured masses. Improved statistics of clusters
over a wider mass range are required for a better control of the intrinsic
scatter in scaling relations.Comment: 20 pages, 11 figures, revised version now accepted to Astronomy and
  Astrophysics. Full version with high resolution figures at
  http://www.ast.obs-mip.fr/users/soucail/highlx.pd
p-modes in and away from a sunspot

A time series of GONG Dopplergrams for the period 10-14 May 1997 from Udaipur
and Big Bear sites has been used to measure the velocity fluctuations in the
sunspot (NOAA active region 8038) and quiet photosphere simultaneously. We
observe that the power of pre-dominant p-mode is reduced in the sunspot as
compared to quiet photosphere by 39-52% depending on the location of the
sunspot region on the solar disk. We also observe a relative peak frequency
deviation of p-modes in the sunspot, of the order of 80-310 $\mu$Hz, which
shows a linear dependence on the magnetic field gradient in the active region.
The maximum frequency deviation of 310 $\mu$Hz on 12 May appears to be an
influence of a long duration solar flare that occurred in this active region.
We interpret this relative peak frequency deviation as either due to power
re-distribution of p-modes in the sunspot or a consequence of frequency
modulation of these modes along the magnetic flux tubes due to rapidly varying
magnetic field structure.Comment: Accepted in Solar Phys. Uses Kluwer.sty. Also available at
  http://www.uso.ernet.in/~sushan
Hydrodynamics from Grad's equations: What can we learn from exact
  solutions?

A detailed treatment of the classical Chapman-Enskog derivation of
hydrodynamics is given in the framework of Grad's moment equations. Grad's
systems are considered as the minimal kinetic models where the Chapman-Enskog
method can be studied exactly, thereby providing the basis to compare various
approximations in extending the hydrodynamic description beyond the
Navier-Stokes approximation. Various techniques, such as the method of partial
summation, Pade approximants, and invariance principle are compared both in
linear and nonlinear situations.Comment: 61 pages. Slightly edited and corrected version. It follows mostly
  Chapter 8 of the book: Gorban, A.N. and Karlin, I.V., Invariant Manifolds for
  Physical and Chemical Kinetics, Lect. Notes Phys. 660, Springer, Berlin,
  Heidelberg, 200
A generalized Chudley-Elliott vibration-jump model in activated atom
  surface diffusion

Here the authors provide a generalized Chudley-Elliott expression for
activated atom surface diffusion which takes into account the coupling between
both low-frequency vibrational motion (namely, the frustrated translational
modes) and diffusion. This expression is derived within the Gaussian
approximation framework for the intermediate scattering function at low
coverage. Moreover, inelastic contributions (arising from creation and
annihilation processes) to the full width at half maximum of the quasi-elastic
peak are also obtained.Comment: (5 pages, 2 figures; revised version
Search for Higgs Bosons and Other Massive States decaying into two
  Photons in e+e- Collisions at 189 GeV

A search is described for the generic process e+e- to X Y, where X is a
neutral heavy scalar boson decaying into a pair of photons, and Y is a neutral
heavy boson (scalar or vector) decaying into a fermion pair. The search is
motivated mainly by the cases where either X, or both X and Y, are Higgs
bosons. In particular, we investigate the case where X is the Standard Model
Higgs boson and Y the Z0 boson. Other models with enhanced Higgs boson decay
couplings to photon pairs are also considered. The present search combines the
data set collected by the OPAL collaboration at 189 GeV collider energy, having
an integrated luminosity of 182.6pb-1, with data samples collected at lower
energies. The search results have been used to put 95% confidence level bounds,
as functions of the mass of X, on the product of the cross-section and the
relevant branching ratios, both in a model independent manner and for the
particular models considered.Comment: 21 pages, LaTeX, including 5 eps figures, accepted by Phys. Lett.
Spin-Orbit Force from Lattice QCD

We present a first attempt to determine nucleon-nucleon potentials in the
parity-odd sector, which appear in 1P1, 3P0, 3P1, 3P2-3F2 channels, in Nf=2
lattice QCD simulations. These potentials are constructed from the
Nambu-Bethe-Salpeter wave functions for J^P=0^-, 1^- and 2^-, which correspond
to A1^-, T1^- and T2^- + E^- representation of the cubic group, respectively.
We have found a large and attractive spin-orbit potential VLS(r) in the
isospin-triplet channel, which is qualitatively consistent with the
phenomenological determination from the experimental scattering phase shifts.
The potentials obtained from lattice QCD are used to calculate the scattering
phase shifts in 1P1, 3P0, 3P1 and 3P2-3F2 channels. The strong attractive
spin-orbit force and a weak repulsive central force in spin-triplet P-wave
channels lead to an attraction in the 3P2 channel, which is related to the
P-wave neutron paring in neutron stars.Comment: 14 pages, 5 figures, Physics Letters B published versio
Lepton Flavor Violations in High-Scale SUSY with Right-Handed Neutrinos

Motivated by the recent discovery of the Higgs boson at m_h = 126 GeV and
also by the non-observation of superparticles at the LHC, high-scale SUSY,
where the superparticles are as heavy as O(10) TeV, has been recently proposed.
We study lepton-flavor violations (LFVs) in the high-scale SUSY with
right-handed neutrinos. Even if the slepton masses are of O(10) TeV, the
renormalization group (RG) effects on the slepton mass-squared matrix may
induce large enough LFVs which are within the reach of future LFV experiments.
We also discuss the implication of the right-handed neutrinos on the
electroweak symmetry breaking in such a model, and show that the parameter
region with the successful electroweak symmetry breaking is enlarged by the RG
effects due to the right-handed neutrinos.Comment: 11 pages, 3 figure
An Analysis of Ruspini Partitions in G\"odel Logic

By a Ruspini partition we mean a finite family of fuzzy sets $\{f_1, \ldots,
f_n\}$, $f_i : [0,1] \to [0,1]$, such that $\sum_{i=1}^n f_i(x)=1$ for all $x
\in [0,1]$, where $[0,1]$ denotes the real unit interval. We analyze such
partitions in the language of G\"odel logic. Our first main result identifies
the precise degree to which the Ruspini condition is expressible in this
language, and yields inter alia a constructive procedure to axiomatize a given
Ruspini partition by a theory in G\"odel logic. Our second main result extends
this analysis to Ruspini partitions fulfilling the natural additional condition
that each $f_i$ has at most one left and one right neighbour, meaning that
$\min_{x \in [0,1]}{\{f_{i_1}(x),f_{i_2}(x),f_{i_3}(x)\}}=0$ holds for $i_1\neq
i_2\neq i_3$.Comment: 22 page
Fossil Groups Origins III. Characterization of the sample and
  observational properties of fossil systems

(Abridged) Fossil systems are group- or cluster-sized objects whose
luminosity is dominated by a very massive central galaxy. In the current cold
dark matter scenario, these objects formed hierarchically at an early epoch of
the Universe and then slowly evolved until present day. That is the reason why
they are called {\it fossils}. We started an extensive observational program to
characterize a sample of 34 fossil group candidates spanning a broad range of
physical properties. Deep $r-$band images were taken for each candidate and
optical spectroscopic observations were obtained for $\sim$ 1200 galaxies. This
new dataset was completed with SDSS DR7 archival data to obtain robust cluster
membership and global properties of each fossil group candidate. For each
system, we recomputed the magnitude gaps between the two brightest galaxies
($\Delta m_{12}$) and the first and fourth ranked galaxies ($\Delta m_{14}$)
within 0.5 $R_{{\rm 200}}$. We consider fossil systems those with $\Delta
m_{12} \ge 2$ mag or $\Delta m_{14} \ge 2.5$ mag within the errors. We find
that 15 candidates turned out to be fossil systems. Their observational
properties agree with those of non-fossil systems. Both follow the same
correlations, but fossils are always extreme cases. In particular, they host
the brightest central galaxies and the fraction of total galaxy light enclosed
in the central galaxy is larger in fossil than in non-fossil systems. Finally,
we confirm the existence of genuine fossil clusters. Combining our results with
others in the literature, we favor the merging scenario in which fossil systems
formed due to mergers of $L^\ast$ galaxies. The large magnitude gap is a
consequence of the extreme merger ratio within fossil systems and therefore it
is an evolutionary effect. Moreover, we suggest that at least one candidate in
our sample could represent a transitional fossil stage.Comment: 14 pages, 11 figures, accepted for publication in A&
Exploring jet-launching conditions for SFXTs

In the magneto-centrifugal mechanism for jet formation, accreting neutron
stars are assumed to produce relativistic jets only if their surface magnetic
field is weak enough ($B \sim 10^8$ G). However, the most common manifestation
of neutron stars are pulsars, whose magnetic field distribution peaks at $B
\sim 10^{12}$ G. If the neutron star magnetic field has at least this strength
at birth, it must decay considerably before jets can be launched in binary
systems. We study the magnetic field evolution of a neutron star that accretes
matter from the wind of a high-mass stellar companion so that we can constrain
the accretion rate and the impurities in the crust, which are necessary
conditions for jet formation. We solved the induction equation for the
diffusion and convection of the neutron star magnetic field confined to the
crust, assuming spherical accretion in a simpliflied one-dimensional treatment.
We incorporated state-of-the-art microphysics, including consistent thermal
evolution profiles, and assumed two different neutron star cooling scenarios
based on the superfluidity conditions at the core. We find that in this
scenario, magnetic field decay at long timescales is governed mainly by the
accretion rate, while the impurity content and thermal evolution of the neutron
star play a secondary role. For accretion rates $\dot{M}\gtrsim10^{-10}$
M$_{\odot}$ yr$^{-1}$, surface magnetic fields can decay up to four orders of
magnitude in $\sim$10$^7$ yr, which is the timescale imposed by the evolution
of the high-mass stellar companion in these systems. Based on these results, we
discuss the possibility of transient jet-launching in strong wind-accreting
high-mass binary systems like supergiant fast X-ray transients.Comment: 8 pages, 8 figures. Accepted for publication in A&
Inflationary cosmology and the standard model Higgs with a small Hubble
  induced mass

We study the dynamics of the standard model Higgs field in the inflationary
cosmology. Since metastability of our vacuum is indicated by the current
experimental data of the Higgs boson and top quark, inflation models with a
large Hubble parameter may have a problem: In such models, the Higgs field
rolls down towards the unwanted true vacuum due to the large fluctuation in the
inflationary background. However, this problem can be relaxed by supposing an
additional mass term for the Higgs field generated during and after inflation.
We point out that it does not have to be larger than the Hubble parameter if
the number of $e$-folds during inflation is not too large. We demonstrate that
a high reheating temperature is favored in such a relatively small mass case
and it can be checked by future gravitational wave observations. Such an
induced mass can be generated by, {\it e.g.,} a direct coupling to the inflaton
field or nonminimal coupling to gravity.Comment: 25 pages, 5 figures; v2: typos corrected, references, figures, and
  extended discussions added, matches version published in PL
A Supersymmetric and Smooth Compactification of M-theory to AdS(5)

We obtain smooth M-theory solutions whose geometry is a warped product of
AdS_5 and a compact internal space that can be viewed as an S^4 bundle over
S^2. The bundle can be trivial or twisted, depending on the even or odd values
of the two diagonal monopole charges. The solution preserves N=2 supersymmetry
and is dual to an N=1 D=4 superconformal field theory, providing a concrete
framework to study the AdS_5/CFT_4 correspondence in M-theory. We construct
analogous embeddings of AdS_4, AdS_3 and AdS_2 in massive type IIA, type IIB
and M-theory, respectively. The internal spaces have generalized holonomy and
can be viewed as S^n bundles over S^2 for n=4, 5 and 7. Surprisingly, the
dimensions of spaces with generalized holonomy includes D=9. We also obtain a
large class of solutions of AdS\times H^2.Comment: Latex, 12 pages, references added, incorrect statement remove
Oscillations and the onset of chaos in the kinetic equation for interacting Fermi systems

Analysing the recently derived quantum kinetic equation for dense interacting Fermi systems at low temperatures an evolution equation is obtained which combines time derivatives with finite time stepping known from the logistic mapping. This interplay between continuous and finite model leads to oscillations in the time evolution of the distribution function and shows bifurcations up to chaotic behaviour. The temperature and density conditions are presented where such oscillations and bifurcations can appear
Invariant Actions for Noncommutative Gravity

Two main problems face the construction of noncommutative actions for gravity with star products: the complex metric and finding an invariant measure. The only gauge groups that could be used with star products are the unitary groups. I propose an invariant gravitational action in $D=2n$ dimensions based on the constrained gauge group $U(2^{n})$ broken down to $U(2^{n-1})$ for $n>2$. When $n=2$ the gauge group U(4) is broken to $U(2)\times U(2).$ No metric is used, thus giving a naturally invariant measure. For odd dimensions, $D=2n+1$, the only possible gravitational actions that can be constructed in this formalism are of the Chern-Simons type based on the group $U(2^{n})$ and are therefore topological. These actions can be easily generalized to the noncommutative case by replacing ordinary products with star products. The four dimensional noncommutative action is studied
Bose-Einstein Correlations of $\pi^{0}$ Pairs from Hadronic $Z^{0}$ Decays

We observed Bose-Einstein correlation in pi0 pairs produced in Z0 decays using the data sample collected by the OPAL detector at LEP 1 from 1991 to 1995. Using a static Gaussian picture for the pion emitter source, we obtain the chaoticity parameter lambda = 0.55 +- 0.10 +- 0.10 and the source radius R = (0.59 +- 0.08 +- 0.05) fm. according to the JETSET and HERWIG Monte Carlo models, the Bose-Einstein correlations in our data sample largely connect pi0s originating from the decays of different hadrons. Prompt pions formed at string break-up of cluster decays only form a small fraction of the sample
A central closure construction for certain extensions. Applications to
  Hopf algebra actions

Algebra extensions A < B where A is a left B-module such that the B-action
extends the multiplication in A are ubiquitous. We encounter examples of such
extensions in the study of group actions, group gradings or more general Hopf
actions as well as in the study of the bimodule structure of an algebra. In
this paper we are extending R.Wisbauer's method of constructing the central
closure of a semiprime algebra using its multiplication algebra to those kinds
of algebra extensions. More precisely if A is a k-algebra and B some subalgebra
of End(A) that contains the multiplication algebra of A, then the
self-injective hull \hat{A} of A as B-module becomes an k-algebra provided A
does not contain any nilpotent B-stable ideals. We show that under certain
assumptions \hat{A} can be identified with a subalgebra of the Martindale
quotient ring of A. This construction is then applied to Hopf module algebras.Comment: LaTeX, 17 page
Large deviations and support results for nonlinear Schrodinger equations
  with additive noise and applications

Sample path large deviations for the laws of the solutions of stochastic
nonlinear Schrodinger equations when the noise converges to zero are presented.
The noise is a complex additive gaussian noise. It is white in time and colored
space wise. The solutions may be global or blow-up in finite time, the two
cases are distinguished. The results are stated in trajectory spaces endowed
with projective limit topologies. In this setting, the support of the law of
the solution is also characterized. As a consequence, results on the law of the
blow-up time and asymptotics when the noise converges to zero are obtained. An
application to the transmission of solitary waves in fiber optics is also
given
F-Theory Vacua with Z_3 Gauge Symmetry

Discrete gauge groups naturally arise in F-theory compactifications on
genus-one fibered Calabi-Yau manifolds. Such geometries appear in families that
are parameterized by the Tate-Shafarevich group of the genus-one fibration.
While the F-theory compactification on any element of this family gives rise to
the same physics, the corresponding M-theory compactifications on these
geometries differ and are obtained by a fluxed circle reduction of the former.
In this note, we focus on an element of order three in the Tate-Shafarevich
group of the general cubic. We discuss how the different M-theory vacua and the
associated discrete gauge groups can be obtained by Higgsing of a pair of
five-dimensional U(1) symmetries. The Higgs fields arise from vanishing cycles
in $I_2$-fibers that appear at certain codimension two loci in the base. We
explicitly identify all three curves that give rise to the corresponding Higgs
fields. In this analysis the investigation of different resolved phases of the
underlying geometry plays a crucial r\^ole.Comment: 13 page
Anti-de-Sitter regular electric multipoles: towards Einstein-Maxwell-AdS
  solitons

We discuss electrostatics in Anti-de-Sitter ($AdS$) spacetime, in global
coordinates. We observe that the multipolar expansion has two crucial
differences to that in Minkowski spacetime. First, there are everywhere regular
solutions, with finite energy, for every multipole moment except for the
monopole. Second, all multipole moments decay with the same inverse power of
the areal radius, $1/r$, as spatial infinity is approached. The first
observation suggests there may be regular, self-gravitating, Einstein-Maxwell
solitons in $AdS$ spacetime. The second observation, renders a
Lichnerowicz-type no-soliton theorem inapplicable. Consequently, we suggest
Einstein-Maxwell solitons exist in $AdS$, and we support this claim by
computing the first order metric perturbations sourced by test electric field
multipoles, which are obtained analytically in closed form.Comment: 13 pages, 3 figures, accepted in Phys. Lett.
Summary of the searches for squarks and gluinos using $\sqrt{s}$ = 8 TeV
  pp collisions with the ATLAS experiment at the LHC

A summary is presented of ATLAS searches for gluinos and first- and
second-generation squarks in final states containing jets and missing
transverse momentum, with or without leptons or b-jets, in the $\sqrt{s}$ = 8
TeV data set collected at the Large Hadron Collider in 2012. This paper reports
the results of new interpretations and statistical combinations of previously
published analyses, as well as a new analysis. Since no significant excess of
events over the Standard Model expectation is observed, the data are used to
set limits in a variety of models. In all the considered simplified models that
assume R-parity conservation, the limit on the gluino mass exceeds 1150 GeV at
95% confidence level, for an LSP mass smaller than 100 GeV. Furthermore,
exclusion limits are set for left-handed squarks in a phenomenological MSSM
model, a minimal Supergravity/Constrained MSSM model, R-parity-violation
scenarios, a minimal gauge-mediated supersymmetry breaking model, a natural
gauge mediation model, a non-universal Higgs mass model with gaugino mediation
and a minimal model of universal extra dimensions.Comment: 91 pages plus author list (107 pages total), 43 figures, 23 tables,
  submitted to JHEP, All figures including auxiliary figures are available at
  https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2014-06
Ce(Mn,Fe)O2 –(La,Sr)(Fe,Mn)O3 composite as an active cathode for electrochemical reduction of CO2 in proton conducting solid oxide cells

We thank EPSRC (EP/I022570/1, EP/K015540/1, EP/I038950/1) and the Royal Society (Wolfson Research Merit award) for support.A solid oxide electrolysis cell concept for reducing CO2 to CO was studied using a proton conducting mixed oxide- BaCe0.7Zr0.1Y0.1Yb0.06Zn0.04O3-δ (BCZYYZ) as an electrolyte. The oxide composite mixture: Ce0.6Mn0.3Fe0.1O2 – La0.6Sr0.4Fe0.9Mn0.1O3 (12.5-87.5 wt%) was examined as enhancing catalyst electrode for CO2 reduction and proton oxidation reaction on the cathode side for avoiding coke formation. Here we demonstrate the successful electrochemical reduction of CO2 in proton conducting SOECs. During electrochemical reduction of CO2 at 700oC, current densities as high as 0.5 A/cm2 and 1 A/cm2 at 1.3 V and 2.2 V respectively, were withdrawn even though the cell employed a 400 μm thick BCZYYZ electrolyte support.Publisher PDFPeer reviewe