publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2012-02-14 | The kinetic temperature in a damped Lyman-alpha absorption system in Q2206-199 - an example of the warm neutral medium | By comparing the widths of absorption lines from OI, SiII and FeII in the
redshift z=2.076 single-component damped Lyman alpha absorption system in the
spectrum of Q2206-199 we establish that these absorption lines arise in Warm
Neutral Medium gas at ~12000 +/- 3000K. This is consistent with thermal
equilibrium model e... | 1202.3012v1 |
2012-02-23 | Eigenmodes of the damped wave equation and small hyperbolic subsets | We study stationary solutions of the damped wave equation on a compact and
smooth Riemannian manifold without boundary. In the high frequency limit, we
prove that a sequence of $\beta$-damped stationary solutions cannot be
completely concentrated in small neighborhoods of a small fixed hyperbolic
subset made of $\beta$... | 1202.5123v3 |
2012-02-25 | Fractional Order Phase Shaper Design with Routh's Criterion for Iso-damped Control System | Phase curve of an open loop system is flat in nature if the derivative of
phase with respect to frequency is zero. With a flat phase curve, the
corresponding closed-loop system exhibits an iso-damped property i.e. maintains
constant overshoot with the change of gain and with other parametric
variations. In recent past ... | 1202.5667v1 |
2012-03-04 | Dissipation effects in random transverse-field Ising chains | We study the effects of Ohmic, super-Ohmic, and sub-Ohmic dissipation on the
zero-temperature quantum phase transition in the random transverse-field Ising
chain by means of an (asymptotically exact) analytical strong-disorder
renormalization-group approach. We find that Ohmic damping destabilizes the
infinite-randomne... | 1203.0698v2 |
2012-03-22 | Large Amplitude Longitudinal Oscillations in a Solar Filament | We have developed the first self-consistent model for the observed
large-amplitude oscillations along filament axes that explains the restoring
force and damping mechanism. We have investigated the oscillations of multiple
threads formed in long, dipped flux tubes through the thermal nonequilibrium
process, and found t... | 1203.5027v1 |
2012-03-26 | Analysis of the Energy Decay of a Degenerated Thermoelasticity System | In this paper, we study a system of thermoelasticity with a degenerated
second order operator in the Heat equation. We analyze the evolution of the
energy density of a family of solutions. We consider two cases: when the set of
points where the ellipticity of the Heat operator fails is included in a
hypersurface and wh... | 1203.5606v1 |
2012-03-26 | Infinite Energy Solutions for Damped Navier-Stokes Equations in R2 | We study the so-called damped Navier-Stokes equations in the whole 2D space.
The global well-posedness, dissipativity and further regularity of weak
solutions of this problem in the uniformly-local spaces are verified based on
the further development of the weighted energy theory for the Navier-Stokes
type problems. No... | 1203.5733v2 |
2012-03-28 | Quantum-correlating power of local quantum channels | Quantum correlation can be created by local operations from a classically
correlated state. We define quantum-correlating power (QCP) of a local quantum
channel as the maximum amount of quantum correlation that can be created by the
channel. The quantum correlation that we discuss in this article is defined on
the left... | 1203.6149v1 |
2012-04-12 | On the sizes of z>2 Damped Lyman-alpha Absorbing Galaxies | Recently, the number of detected galaxy counterparts of z > 2 Damped
Lyman-alpha Absorbers in QSO spectra has increased substantially so that we
today have a sample of 10 detections. M{\o}ller et al. in 2004 made the
prediction, based on a hint of a luminosity-metallicity relation for DLAs, that
HI size should increase... | 1204.2833v1 |
2012-04-16 | Quasi-normal modes, area spectra and multi-horizon spacetimes | We suggest an interpretation for the highly damped QNM frequencies of the
spherically symmetric multi-horizon spacetimes (Reissner-Nordstrom,
Schwarzschild-deSitter, Reissner-Nordstrom-deSitter) following Maggiore's
proposal about the link between the asymptotic QNM frequencies and the black
hole thermodynamics. We sho... | 1204.3566v2 |
2012-05-03 | Explicit local time-stepping methods for time-dependent wave propagation | Semi-discrete Galerkin formulations of transient wave equations, either with
conforming or discontinuous Galerkin finite element discretizations, typically
lead to large systems of ordinary differential equations. When explicit time
integration is used, the time-step is constrained by the smallest elements in
the mesh ... | 1205.0654v2 |
2012-05-15 | Molecular vibrations-induced quantum beats in two-dimensional electronic spectroscopy | Quantum beats in nonlinear spectroscopy of molecular aggregates are often
attributed to electronic phenomena of excitonic systems, while nuclear degrees
of freedom are commonly included into models as overdamped oscillations of bath
constituents responsible for dephasing. However, molecular systems are coupled
to vario... | 1205.3383v2 |
2012-05-16 | Deuterium at high-redshift: Primordial abundance in the zabs = 2.621 damped Ly-alpha system towards CTQ247 | The detection of neutral deuterium in the low-metallicity damped
Lyman-{\alpha} system at zabs = 2.621 towards the quasar CTQ247 is reported.
Using a high signal-to-noise and high spectral resolution (R = 60000) spectrum
from the Very Large Telescope Ultraviolet and Visual Echelle Spectrograph, we
precisely measure the... | 1205.3777v1 |
2012-05-23 | Global existence for a damped wave equation and convergence towards a solution of the Navier-Stokes problem | In two and three space dimensions, and under suitable assumptions on the
initial data, we show global existence for a damped wave equation which
approaches, in some sense, the Navier-Stokes problem. The proofs are based on a
refined energy method. In this paper, we improve the results in two papers by
Y. Brenier, R. Na... | 1205.5166v2 |
2012-05-24 | Modelling the Propagation of a Weak Fast-Mode MHD Shock Wave near a 2D Magnetic Null Point Using Nonlinear Geometrical Acoustics | We present the results of analytical modelling of fast-mode
magnetohydrodynamic wave propagation near a 2D magnetic null point. We consider
both a linear wave and a weak shock and analyse their behaviour in cold and
warm plasmas. We apply the nonlinear geometrical acoustics method based on the
Wentzel-Kramers-Brillouin... | 1205.5327v1 |
2012-05-31 | Quasinormal modes for the scattering on a naked Reissner-Nordstrom singularity | What should be the quasinormal modes associated with a spacetime that
contains a naked singularity instead of a black hole? In the present work we
address this problem by studying the scattering of scalar fields on a curved
background described by a Reissner-Nordstr\"om spacetime with $|q| > m$. We
show that there is a... | 1206.0037v3 |
2012-06-06 | Perturbation theory for very long-range potentials | Systems with very long-range interactions (that decay at large distances like
$U(r)\sim r^{-l}$ with $l\le d$ where $d$ is the space dimensionality) are
difficult to study by conventional statistical mechanics perturbation methods.
Examples of these systems are gravitational and charged (non-electroneutral).
In this wo... | 1206.2211v2 |
2012-06-10 | Comments on "Plasma oscillations and nonextensive statistics" | The paper, authored by J. A. S. Lima et al, was published in Phys. Rev. E in
2000 has discussed the dispersion relation and Landau damping of Langmuir wave
in the context of the nonextensive statistics proposed by Tsallis. It has been
cited by many authors because the dispersion relation in Tsallis formalism
present a ... | 1206.2345v1 |
2012-06-25 | Ideal MHD Ballooning modes, shear flow and the stable continuum | There is a well established theory of Ballooning modes in a toroidal plasma.
The cornerstone of this is a local eigenvalue lambda on each magnetic surface -
which also depends on the ballooning phase angle k. In stationary plasmas
lambda(k) is required only near its maximum, but in rotating plasmas its
average over k i... | 1206.5855v2 |
2012-06-26 | A Numerical Perspective on Hartree-Fock-Bogoliubov Theory | The method of choice for describing attractive quantum systems is
Hartree-Fock-Bogoliubov (HFB) theory. This is a nonlinear model which allows
for the description of pairing effects, the main explanation for the
superconductivity of certain materials at very low temperature. This paper is
the first study of Hartree-Foc... | 1206.6081v1 |
2012-06-27 | Dynamics of zonal flow-like structures in the edge of the TJ-II stellarator | The dynamics of fluctuating electric field structures in the edge of the
TJ-II stellarator, that display zonal flow-like traits, is studied. These
structures have been shown to be global and affect particle transport
dynamically [J.A. Alonso et al., Nucl. Fus. 52 063010 (2012)]. In this article
we discuss possible driv... | 1206.6191v1 |
2012-07-13 | Decay of capillary wave turbulence | We report on the observation of freely decaying capillary wave turbulence on
the surface of a fluid. The capillary wave turbulence spectrum decay is found
to be self-similar in time with the same power law exponent than the one found
in the stationary regime, in agreement with weak turbulence predictions. The
amplitude... | 1207.3228v1 |
2012-07-17 | Holographic Superfluids and the Dynamics of Symmetry Breaking | We explore the far from equilibrium response of a holographic superfluid
using the AdS/CFT correspondence. We establish the dynamical phase diagram
corresponding to quantum quenches of the order parameter source field. We find
three distinct regimes of behaviour that are related to the spectrum of black
hole quasi-norm... | 1207.4194v2 |
2012-07-18 | Attractiveness of periodic orbits in parametrically forced systemswith time-increasing friction | We consider dissipative one-dimensional systems subject to a periodic force
and study numerically how a time-varying friction affects the dynamics. As a
model system, particularly suited for numerical analysis, we investigate the
driven cubic oscillator in the presence of friction. We find that, if the
damping coeffici... | 1207.4319v1 |
2012-07-19 | Acoustic damping and dispersion in vitreous germanium oxide | New Brillouin scattering measurements of velocity and attenuation of sound in
the hypersonic regime are presented. The data are analyzed together with the
literature results at sonic and ultrasonic frequencies. As usual, thermally
activated relaxation of structural entities describes the attenuation at sonic
and ultras... | 1207.4582v1 |
2012-07-26 | Generic Mechanism of Optimal Energy Transfer Efficiency: A Scaling Theory of the Mean First Passage Time in Exciton Systems | An asymptotic scaling theory is presented using the conceptual basis of
trapping-free subspace (i.e., orthogonal subspace) to establish the generic
mechanism of optimal efficiency of excitation energy transfer (EET) in
light-harvesting systems. Analogous to Kramers' turnover in classical rate
theory, the enhanced effic... | 1207.6197v1 |
2012-07-27 | Dissipative and Non-dissipative Single-Qubit Channels: Dynamics and Geometry | Single-qubit channels are studied under two broad classes: amplitude damping
channels and generalized depolarizing channels. A canonical derivation of the
Kraus representation of the former, via the Choi isomorphism is presented for
the general case of a system's interaction with a squeezed thermal bath. This
isomorphi... | 1207.6519v1 |
2012-07-27 | Phonon Effects on Population Inversion in Quantum Dots: Resonant, Detuned and Frequency-swept Excitations | The effect of acoustic phonons on different light-induced excitations of a
semiconductor quantum dot is investigated. Resonant excitation of the quantum
dot leads to Rabi oscillations, which are damped due to the phonon interaction.
When the excitation frequency is detuned, an occupation can only occur due to
phonon ab... | 1207.6660v2 |
2012-08-08 | Mechanism of collisionless sound damping in dilute Bose gas with condensate | We develop a microscopic theory of sound damping due to Landau mechanism in
dilute gas with Bose condensate. It is based on the coupled evolution equations
of the parameters describing the system. These equations have been derived in
earlier works within a microscopic approach which employs the
Peletminskii-Yatsenko re... | 1208.1653v2 |
2012-08-17 | Detection of domain wall eigenfrequency in infinity-shaped magnetic nanostructures | The dynamics of a magnetic infinity-shaped nanostructure has been
experimentally studied by two different techniques such as the sinusoidal
resonance excitation and the damped short pulse excitation to measure the
eigenfrequency of domain walls. Direct observation of the magnetic domain wall
nucleation has been measure... | 1208.3527v1 |
2012-08-21 | Stress field and spin axis relaxation for inelastic triaxial ellipsoids | A compact formula for the stress tensor inside a self-gravitating, triaxial
ellipsoid in an arbitrary rotation state is given. It contains no singularity
in the incompressible medium limit. The stress tensor and the quality factor
model are used to derive a solution for the energy dissipation resulting in the
damping (... | 1208.4283v2 |
2012-08-21 | Brownian transport in corrugated channels with inertia | The transport of suspended Brownian particles dc-driven along corrugated
narrow channels is numerically investigated in the regime of finite damping. We
show that inertial corrections cannot be neglected as long as the width of the
channel bottlenecks is smaller than an appropriate particle diffusion length,
which depe... | 1208.4401v2 |
2012-08-22 | On unorthodox solutions of the Bloch equations | A systematic, rigorous, and complete investigation of the Bloch equations in
time-harmonic driving classical field is performed. Our treatment is unique in
that it takes full advantage of the partial fraction decomposition over real
number field, which makes it possible to find and classify all analytic
solutions. Torr... | 1208.5736v1 |
2012-08-29 | Optically mediated nonlinear quantum optomechanics | We consider theoretically the optomechanical interaction of several
mechanical modes with a single quantized cavity field mode for linear and
quadratic coupling. We focus specifically on situations where the optical
dissipation is the dominant source of damping, in which case the optical field
can be adiabatically elim... | 1208.5821v1 |
2012-08-31 | Spectrums of Black Hole in de Sitter Spacetime with Highly Damped Quasinormal Modes: High Overtone Case | Motivated by recent physical interpretation on quasinormal modes presented by
Maggiore, the adiabatic quantity method given by Kunstatter is used to
calculate the spectrums of a non-extremal Schwarzschild de Sitter black hole in
this paper, as well as electrically charged case. According to highly damped
Konoplya and Z... | 1208.6485v1 |
2012-09-10 | Rapid ramps across the BEC-BCS crossover: a novel route to measuring the superfluid gap | We investigate the response of superfluid Fermi gases to rapid changes of the
three-dimensional s-wave scattering length a by solving the time-dependent
Bogoliubov-de Gennes equations. In general the magnitude of the order parameter
|\Delta| performs oscillations, which are sometimes called the "Higgs" mode,
with the a... | 1209.2025v1 |
2012-09-12 | Loss of Landau Damping for Bunch Oscillations | Conditions for the existence, uniqueness and stability of self-consistent
bunch steady states are considered. For the existence and uniqueness problems,
simple algebraic criteria are derived for both the action and Hamiltonian
domain distributions. For the stability problem, van Kampen theory is used. The
onset of a di... | 1209.2715v1 |
2012-09-17 | Generalized fluctuation-dissipation relation and statistics for the equilibrium of a system with conformation dependent damping | Liouville's theorem, based on the Hamiltonian flow (micro-canonical ensemble)
for a many particle system, indicates that the (stationary) equilibrium
probability distribution is a function of the Hamiltonian. A canonical ensemble
corresponds to a micro-canonical one at thermodynamic limit. On the contrary,
the dynamics... | 1209.3654v3 |
2012-09-20 | High Resolution BPM Upgrade for the ATF Damping Ring at KEK | A beam position monitor (BPM) upgrade at the KEK Accelerator Test Facility
(ATF) damping ring has been accomplished, carried out by a KEK/FNAL/SLAC
collaboration under the umbrella of the global ILC R&D effort. The upgrade
consists of a high resolution, high reproducibility read-out system, based on
analog and processi... | 1209.4569v1 |
2012-09-23 | Ion Landau Damping on Drift Tearing Modes | Kinetic treatments of drift-tearing modes that match an inner resonant layer
solution to an external MHD region solution, characterised by
$\Delta^{\prime}$, fail to properly match the ideal MHD boundary condition on
the parallel electric field, $E_{\parallel}.$ In this paper we demonstrate how
consideration of ion sou... | 1209.5054v3 |
2012-09-26 | Damping of giant dipole resonance in highly excited nuclei | The giant dipole resonance's (GDR) width and shape at finite temperature and
angular momentum are described within the phonon damping model (PDM), which
predicts an overall increase in the GDR's total width at low and moderate
temperature T, and its saturation at high T. At T< 1 MeV the GDR width remains
nearly constan... | 1209.5820v2 |
2012-09-26 | Inverse Energy Cascade in Forced 2D Quantum Turbulence | We demonstrate an inverse energy cascade in a minimal model of forced 2D
quantum vortex turbulence. We simulate the Gross-Pitaevskii equation for a
moving superfluid subject to forcing by a stationary grid of obstacle
potentials, and damping by a stationary thermal cloud. The forcing injects
large amounts of vortex ene... | 1209.5824v2 |
2012-09-27 | Comparison of non-Markovianity criteria in a qubit system under random external fields | We give the map representing the evolution of a qubit under the action of
non-dissipative random external fields. From this map we construct the
corresponding master equation that in turn allows us to phenomenologically
introduce population damping of the qubit system. We then compare, in this
system, the time-regions ... | 1209.6331v2 |
2012-10-01 | Gravitational Coleman-Weinberg Potential and It's Finite Temperature Counterpart | Coleman-Weinberg (CW) phenomena for the case of gravitons minimally coupled
to massless scalar field is studied. The one loop effect completely vanishes if
there is no self interaction term present in the matter sector. The one loop
effective potential is shown to develop an instability in the form of acquiring
an imag... | 1210.0497v4 |
2012-10-09 | Analytic approximate seismology of propagating MHD waves in the solar corona | Observations show that propagating magnetohydrodynamic (MHD) waves are
ubiquitous in the solar atmosphere. The technique of MHD seismology uses the
wave observations combined with MHD wave theory to indirectly infer physical
parameters of the solar atmospheric plasma and magnetic field. Here we present
an analytical se... | 1210.2689v1 |
2012-10-12 | Threshold current for switching of a perpendicular magnetic layer induced by spin Hall effect | We theoretically investigate the switching of a perpendicular magnetic layer
by in-plane charge current due to the spin Hall effect. We find that, in the
high damping regime, the threshold switching current is independent of the
damping constant, and is almost linearly proportional to both effective
perpendicular magne... | 1210.3442v2 |
2012-10-12 | Reversal of magnetization of a single-domain magnetic particle by the ac field of time-dependent frequency | We report numerical and analytical studies of the reversal of the magnetic
moment of a single-domain magnetic particle by a circularly polarized ac field
of time-dependent frequency. For the time-linear frequency sweep, the phase
diagrams are computed that illustrate the dependence of the reversal on the
frequency swee... | 1210.3530v1 |
2012-10-15 | Symmetries of the quantum damped harmonic oscillator | For the non-conservative Caldirola-Kanai system, describing a quantum damped
harmonic oscillator, a couple of constant-of-motion operators generating the
Heisenberg-Weyl algebra can be found. The inclusion of the standard time
evolution generator (which is not a symmetry) as a symmetry in this algebra, in
a unitary man... | 1210.4058v1 |
2012-10-18 | SDO/AIA Observations of Large-Amplitude Longitudinal Oscillations in a Solar Filament | We present the first \emph{Solar Dynamics Observatory}/Atmospheric Imaging
Assembly observations of the large-amplitude longitudinal (LAL) oscillations in
the south and north parts (SP and NP) of a solar filament on 2012 April 7. Both
oscillations are triggered by flare activities close to the filament. The
period vari... | 1210.5110v1 |
2012-10-31 | The Kerr medium as an {\sf SU(2)} system | The Kerr medium in the presence of damping and associated with SU(1,1)
symmetry, is solved using the techniques of Thermo field Dynamics (TFD).These
TFD techniques, well studied earlier (Chaturvedi and Srinivasan, 1991), help us
to exactly solve the Kerr medium as a spin damped system associated with SU(2)
symmetry. Us... | 1210.8240v1 |
2012-12-06 | A simple and effective Verlet-type algorithm for simulating Langevin dynamics | We present a revision to the well known Stormer-Verlet algorithm for
simulating second order differential equations. The revision addresses the
inclusion of linear friction with associated stochastic noise, and we
analytically demonstrate that the new algorithm correctly reproduces diffusive
behavior of a particle in a... | 1212.1244v4 |
2012-12-10 | Shear viscosity and the r-mode instability window in superfluid neutron stars | We analyze how recent computations of the shear viscosity $\eta$ in the core
of superfluid neutron stars affect the r-mode instability window. We first
analyze the contribution of superfluid phonons to the viscosity, both in their
hydrodynamical and ballistic regime. We also consider the recent computation of
$\eta$ ar... | 1212.2075v2 |
2012-12-12 | The operator sum-difference representation for quantum maps: application to the two-qubit amplitude damping channel | On account of the Abel-Galois no-go theorem for the algebraic solution to
quintic and higher order polynomials, the eigenvalue problem and the associated
characteristic equation for a general noise dynamics in dimension $d$ via the
Choi-Jamiolkowski approach cannot be solved in general via radicals. We provide
a way ar... | 1212.2780v1 |
2012-12-13 | Efficiency improvement of the frequency-domain BEM for rapid transient elastodynamic analysis | The frequency-domain fast boundary element method (BEM) combined with the
exponential window technique leads to an efficient yet simple method for
elastodynamic analysis. In this paper, the efficiency of this method is further
enhanced by three strategies. Firstly, we propose to use exponential window
with large dampin... | 1212.3032v2 |
2012-12-16 | Decay of the solution to the bipolar Euler-Poisson system with damping in $\mathbb{R}^3$ | We construct the global solution to the Cauchy's problem of the bipolar
Euler-Poisson equations with damping in $\mathbb{R}^3$ when $H^3$ norm of the
initial data is small. If further, the $\dot{H}^{-s}$ norm ($0\leq s<3/2)$ or
$\dot{B}_{2,\infty}^{-s}$ norm ($0<s\leq3/2$) of the initial data is bounded,
we give the op... | 1212.3754v2 |
2012-12-24 | Effects of kappa distribution function on Landau damping in electrostatic Vlasov simulation | Effects of non-thermal high-energy electrons on Langmuir wave-particle
interaction are investigated by an initial value approach. A Vlasov-Poisson
simulation is employed which is based on the splitting scheme by Cheng and
Knorr [Cheng, C.Z. and G. Knorr, 1976: J. Comput. Phys. 22, 330-351.]. The
kappa distribution func... | 1212.5872v1 |
2012-12-26 | Anomalous dynamic back-action in interferometers | We analyze the dynamic optomechanical back-action in signal-recycled
Michelson and Michelson-Sagnac interferometers that are operated off dark port.
We show that in this case --- and in contrast to the well-studied canonical
form of dynamic back-action on dark port --- optical damping in a
Michelson-Sagnac interferomet... | 1212.6242v2 |
2013-01-01 | A scattering approach to some aspects of the Schwarzschild Black Hole | In this paper, we consider a massless field, with spin j, in interaction with
a Schwarzschild black hole in four dimensions, focusing mainly our study on the
s-wave scattering. First, using a Fourier analysis, we show that one can have a
simple and natural description of the Physics near the event horizon without
using... | 1301.0108v1 |
2013-01-02 | Memory models of adaptive behaviour | Adaptive response to a varying environment is a common feature of biological
organisms. Reproducing such features in electronic systems and circuits is of
great importance for a variety of applications. Here, we consider memory models
inspired by an intriguing ability of slime molds to both memorize the period of
tempe... | 1301.0209v2 |
2013-01-03 | Collective modes of a two-dimensional spin-1/2 Fermi gas in a harmonic trap | We derive analytical expressions for the frequency and damping of the lowest
collective modes of a two-dimensional Fermi gas using kinetic theory. For
strong coupling, we furthermore show that pairing correlations overcompensate
the effects of Pauli blocking on the collision rate for a large range of
temperatures, resu... | 1301.0358v2 |
2013-01-09 | Synthesis of new neutron-rich heavy nuclei: An experimentalist's view | I attempt to experimentally evaluate the prospects of synthesizing new
neutron- rich superheavy nuclei. I consider three possible synthetic paths to
neutron- rich superheavy nuclei: (a) the use of neutron-rich radioactive beams.
(b) the use of damped collisions and (c) the use of multi-nucleon transfer
reactions. I con... | 1301.1759v1 |
2013-01-13 | Entanglement dynamics of non-inertial observers in a correlated environment | Effect of decoherence and correlated noise on the entanglement of X-type
state of the Dirac fields in the non-inertial frame is investigated. A two
qubit X-state is considered to be shared between the partners where Alice is in
inertial frame and Rob in an accelerated frame. The concurrence is used to
quantify the enta... | 1301.2759v1 |
2013-01-13 | Decoherence and multipartite entanglement of non-inertial observers | Decoherence effect on multipartite entanglement in non-inertial frames is
investigated. GHZ state is considered to be shared between the partners with
one partner in inertial frame whereas the other two in accelerated frames.
One-tangle and {\pi}-tangles are used to quantify the entanglement of the
multipartite system ... | 1301.2765v2 |
2013-01-18 | Current induced torques and interfacial spin-orbit coupling: Semiclassical Modeling | In bilayer nanowires consisting of a ferromagnetic layer and a non-magnetic
layer with strong spin-orbit coupling, currents create torques on the
magnetization beyond those found in simple ferromagnetic nanowires. The
resulting magnetic dynamics appear to require torques that can be separated
into two terms, damping-li... | 1301.4513v1 |
2013-01-23 | Characterization of magnetostatic surface spin waves in magnetic thin films: evaluation for microelectronic applications | The authors have investigated the possibility of utilizing spin waves for
inter- and intra-chip communications, and as logic elements using both
simulations and experimental techniques. Through simulations it has been shown
that the decay lengths of magnetostatic spin waves are affected most by the
damping parameter, a... | 1301.5395v1 |
2013-01-25 | Driven skyrmions and dynamical transitions in chiral magnets | We study the dynamics of skyrmions in chiral magnets in the presence of a
spin polarized current. The motion of skyrmions in the ferromagnetic background
excites spin waves and contributes to additional damping. At a large current,
the spin wave spectrum becomes gapless and skyrmions are created dynamically
from the fe... | 1301.5963v2 |
2013-02-13 | Entanglement of Tripartite States with Decoherence in Noninertial frames | The one-tangle and {\pi}-tangle are used to quantify the entanglement of a
tripartite GHZ state in noninertial frames when the system interacts with a
noisy environment in the form of phase damping, phase flip and bit flip
channel. It is shown that the two-tangles behave as a closed system. The
one-tangle and {\pi}-tan... | 1302.3005v1 |
2013-02-17 | Global existence and exponential growth for a viscoelastic wave equation with dynamic boundary conditions | The goal of this work is to study a model of the wave equation with dynamic
boundary conditions and a viscoelastic term. First, applying the Faedo-Galerkin
method combined with the fixed point theorem, we show the existence and
uniqueness of a local in time solution. Second, we show that under some
restrictions on the ... | 1302.4036v1 |
2013-02-22 | Mixing of blackbodies: Increasing our view of inflation to 17 e-folds with spectral distortions from Silk damping | Silk damping in the early Universe, before and during recombination, erases
anisotropies in the cosmic microwave background (CMB) on small scales. This
power, which disappears from anisotropies, appears in the monopole as y-type,
i-type and \mu-type distortions. The observation of the CMB spectral
distortions will thus... | 1302.5633v1 |
2013-02-26 | Tenfold reduction of Brownian noise in optical interferometry | Thermally induced fluctuations impose a fundamental limit on precision
measurement. In optical interferometry, the current bounds of stability and
sensitivity are dictated by the excess mechanical damping of the
high-reflectivity coatings that comprise the cavity end mirrors. Over the
preceding decade, the mechanical l... | 1302.6489v1 |
2013-03-01 | Quantum error correction and detection: quantitative analysis of a coherent-state amplitude damping code | We re-examine a non-Gaussian quantum error correction code designed to
protect optical coherent-state qubits against errors due to an amplitude
damping channel. We improve on a previous result [Phys. Rev. A 81, 062344
(2010)] by providing a tighter upper bound on the performance attained when
considering realistic assu... | 1303.0273v2 |
2013-03-04 | Transverse oscillations in solar spicules induced by propagating Alfvenic pulses | The excitation of Alfvenic waves in the solar spicules due to the localized
Alfvenic pulse is investigated. A set of incompressible MHD equations in two
dimensional $x-z$ plane with steady flows and sheared magnetic fields is
solved. Stratification due to gravity and transition region between
chromosphere and corona ar... | 1303.0833v1 |
2013-03-04 | Tidal damping of the mutual inclination in hierachical systems | Hierarchical two-planet systems, in which the inner body's semi-major axis is
between 0.1 and 0.5 AU, usually present high eccentricity values, at least for
one of the orbits. As a result of the formation process, one may expect that
planetary systems with high eccentricities also have high mutual inclinations.
However... | 1303.0864v2 |
2013-03-05 | Anomalous velocity distributions in active Brownian suspensions | Large scale simulations and analytical theory have been combined to obtain
the non-equilibrium velocity distribution, $f(v)$, of randomly accelerated
particles in suspension. The simulations are based on an event-driven
algorithm, generalised to include friction. They reveal strongly anomalous but
largely universal dis... | 1303.0996v3 |
2013-03-07 | Quantum critical metals in $d=3+1$ | We study the problem of disorder-free metals near a continuous Ising nematic
quantum critical point in $d=3+1$ dimensions. We begin with perturbation theory
in the `Yukawa' coupling between the electrons and undamped bosons (nematic
order parameter fluctuations) and show that the perturbation expansion breaks
down belo... | 1303.1587v2 |
2013-03-08 | Ultra High Energy Electrons Powered by Pulsar Rotation | A new mechanism of particle acceleration to ultra high energies, driven by
the rotational slow down of a pulsar (Crab pulsar, for example), is explored.
The rotation, through the time dependent centrifugal force, can very
efficiently excite unstable Langmuir waves in the e-p plasma of the star
magnetosphere via a param... | 1303.2093v1 |
2013-04-01 | Fidelity of remote state preparation can be enhanced by local operation | Remote state preparation (RSP) is a quantum information protocol which allows
preparing a quantum state at a distant location with the help of a preshared
nonclassical resource state and a classical channel. The efficiency of
successfully doing this task can be represented by the RSP-fidelity of the
resource state. In ... | 1304.0283v1 |
2013-04-06 | Coronal loop physical parameters from the analysis of multiple observed transverse oscillations | The analysis of quickly damped transverse oscillations of solar coronal loops
using magneto-hydrodynamic seismology allow us to infer physical parameters
that are difficult to measure otherwise. Under the assumption that such damped
oscillations are due to the resonant conversion of global modes into Alfven
oscillation... | 1304.1921v1 |
2013-04-15 | Vibrational Resonance in the Morse Oscillator | We investigate the occurrence of vibrational resonance in both classical and
quantum mechanical Morse oscillators driven by a biharmonic force. The
biharmonic force consists of two forces of widely different frequencies \omega
and \Omega with \Omega>>\omega. In the damped and biharmonically driven
classical Morse oscil... | 1304.3988v1 |
2013-04-15 | Energy dissipation in DC-field driven electron lattice coupled to fermion baths | Electron transport in electric-field-driven tight-binding lattice coupled to
fermion baths is comprehensively studied. We reformulate the problem by using
the scattering state method within the Coulomb gauge. Calculations show that
the formulation justifies direct access to the steady-state bypassing the
time-transient... | 1304.4269v1 |
2013-04-17 | An oscillating motion of a red blood cell and a neutrally buoyant particle in Poiseuille flow in a narrow channel | Two motions of oscillation and vacillating breathing (swing) of a red blood
cell have been observed in bounded Poiseuille flows (Phys. Rev. E 85, 16307
(2012)). To understand such motions, we have studied the oscillating motion of
a neutrally buoyant rigid particle of the same shape in Poiseuille flow in a
narrow chann... | 1304.4971v1 |
2013-04-24 | Finite amplitude inhomogeneous waves in Mooney-Rivlin viscoelastic solids | New exact solutions are exhibited within the framework of finite
viscoelasticity. More precisely, the solutions correspond to finite-amplitude,
transverse, linearly-polarized, inhomogeneous motions superposed upon a finite
homogeneous static deformation. The viscoelastic body is composed of a
Mooney-Rivlin viscoelastic... | 1304.6748v1 |
2013-04-28 | On the role of transition region on the Alfven wave phase mixing in solar spicules | Alfvenic waves are thought to play an important role in coronal heating and
solar wind acceleration. Here we investigate the dissipation of standing Alfven
waves due to phase mixing at the presence of steady flow and sheared magnetic
field in the stratified atmosphere of solar spicules. The transition region
between ch... | 1304.7764v1 |
2013-05-03 | Viscosity, wave damping and shock wave formation in cold hadronic matter | We study linear and nonlinear wave propagation in a dense and cold hadron gas
and also in a cold quark gluon plasma, taking viscosity into account and using
the Navier-Stokes equation. The equation of state of the hadronic phase is
derived from the nonlinear Walecka model in the mean field approximation. The
quark gluo... | 1305.0798v2 |
2013-05-07 | Periodically Driven Holographic Superconductor | As a first step towards our holographic investigation of the
far-from-equilibrium physics of periodically driven systems at strong coupling,
we explore the real time dynamics of holographic superconductor driven by a
monochromatically alternating electric field with various frequencies. As a
result, our holographic sup... | 1305.1600v2 |
2013-05-07 | Micromagnetic modelling of anisotropic damping in ferromagnet | We report a numerical implementation of the Landau-Lifshitz-Baryakhtar
theory, which dictates that the micromagnetic relaxation term obeys the
symmetry of the magnetic crystal, i. e. replacing the single intrinsic damping
constant with a tensor of corresponding symmetry. The effect of anisotropic
relaxation is studied ... | 1305.1641v2 |
2013-05-08 | Existence, uniqueness and analyticity of space-periodic solutions to the regularised long-wave equation | We consider space-periodic evolutionary and travelling-wave solutions to the
regularised long-wave equation (RLWE) with damping and forcing. We establish
existence, uniqueness and smoothness of the evolutionary solutions for smooth
initial conditions, and global in time spatial analyticity of such solutions
for analyti... | 1305.1813v1 |
2013-05-08 | The Persistence of Uphill Anomalous Transport in Inhomogeneous Media | For systems out of equilibrium and subjected to a static bias force it can
often be expected that particle transport will usually follow the direction of
this bias. However, counter-examples exist where particles exhibit uphill
motion (known as absolute negative mobility - ANM), particularly in the case of
coupled part... | 1305.1841v2 |
2013-05-11 | Dividing Line between Quantum and Classical Trajectories: Bohmian Time Constant | This work proposes an answer to a challenge posed by Bell on the lack of
clarity in regards to the line between the quantum and classical regimes in a
measurement problem. To this end, a generalized logarithmic nonlinear
Schr\"odinger equation is proposed to describe the time evolution of a quantum
dissipative system u... | 1305.2517v2 |
2013-05-11 | Giant dipole resonance in $^{88}$Mo from phonon damping model's strength functions averaged over temperature and angular momentum distributions | The line shapes of giant dipole resonance (GDR) in the decay of the compound
nucleus $^{88}$Mo, which is formed after the fusion-evaporation reaction
$^{48}$Ti + $^{40}$Ca at various excitation energies $E^{*}$ from 58 to 308
MeV, are generated by averaging the GDR strength functions predicted within the
phonon damping... | 1305.2518v1 |
2013-05-20 | Quench Dynamics in Bose condensates in the Presence of a Bath: Theory and Experiment | In this paper we study the transient dynamics of a Bose superfluid subsequent
to an interaction quench. Essential for equilibration is a source of
dissipation which we include following the approach of Caldeira and Leggett.
Here we solve the equations of motion exactly by integrating out an
environmental bath. We there... | 1305.4594v2 |
2013-05-21 | Restoration of Quantum State in Dephasing Channel | In this paper, we propose an explicit scheme to fully recover a
multiple-qubit state subject to a phase damping noise. We establish the
theoretical framework and the operational procedure to restore an unknown
initial quantum state for an N-qubit model interacting with either individual
baths or a common bath. We give ... | 1305.4627v2 |
2013-05-28 | Generalized Plasma Dispersion Function: One-Solve-All Treatment, Visualizations, and Application to Landau Damping | A unified, fast, and effective approach is developed for numerical
calculation of the well-known plasma dispersion function with extensions from
Maxwellian distribution to almost arbitrary distribution functions, such as the
$\delta$, flat top, triangular, $\kappa$ or Lorentzian, slowing down, and
incomplete Maxwellian... | 1305.6476v2 |
2013-06-20 | Linear flutter analysis of functionally graded panels using cell based smoothed finite element method and discrete shear gap technique | In this paper, a cell-based smoothed finite element method with discrete
shear gap technique for triangular ele- ments is employed to study the linear
flutter characteristics of functionally graded material (FGM) flat panels. The
influence of thermal environment, the presence of a centrally located circular
cutout and ... | 1306.4978v1 |
2013-06-29 | Resolving the effects of frequency dependent damping and quantum phase diffusion in YBa$_2$Cu$_3$O$_{7-x}$ Josephson junctions | We report on the study of the phase dynamics of high critical temperature
superconductor Josephson junctions. We realized YBa$_2$Cu$_3$O$_{7-x}$ (YBCO)
grain boundary (GB) biepitaxial junctions in the submicron scale, using low
loss substrates, and analyzed their dissipation by comparing the transport
measurements with... | 1307.0106v1 |
2013-07-03 | A new mechanism for saturating unstable r-modes in neutron stars | We consider a new mechanism for damping the oscillations of a mature neutron
star. The new dissipation channel arises if superfluid vortices are forced to
cut through superconducting fluxtubes. This mechanism is interesting because
the oscillation modes need to exceed a critical amplitude in order for it to
operate. On... | 1307.0985v1 |
2013-07-03 | Exotic matter influence on the polar quasi-normal modes of neutron stars with equations of state satisfying the $2 M_{\odot}$ constraint | In this paper we analyze the quasi-normal mode spectrum of realistic neutron
stars by studying the polar modes. In particular we study the spatial wI mode,
the f mode, and the fundamental p mode. The study has been done for 15
different equations of state containing exotic matter and satisfying the $2
M_{\odot}$ constr... | 1307.1063v1 |
2013-07-10 | Absence of damping of low energy excitations in a quasi-2D dipolar Bose gas | We develop a theory of damping of low energy, collective excitations in a
quasi-2D, homogenous, dipolar Bose gas at zero temperature, via processes
whereby an excitation decays into two excitations with lower energy. We find
that owing to the nature of the low energy spectrum of a quasi-2D dipolar gas,
such processes c... | 1307.2910v2 |
2013-07-14 | Asteroseismic effects in close binary stars | Turbulent processes in the convective envelopes of the sun and stars have
been shown to be a source of internal acoustic excitations. In single stars,
acoustic waves having frequencies below a certain cutoff frequency propagate
nearly adiabatically and are effectively trapped below the photosphere where
they are intern... | 1307.3709v1 |
2013-07-31 | Dynamics of ions in the selectivity filter of the KcsA channel: Towards a coupled Brownian particle description | The statistical and dynamical properties of ions in the selectivity filter of
the KcsA ion channel are considered on the basis of molecular dynamics (MD)
simulations of the KcsA protein embedded in a lipid membrane surrounded by an
ionic solution. A new approach to the derivation of a Brownian dynamics (BD)
model of io... | 1307.8298v1 |
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