publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
1997-10-30 | Damping rate for transverse gluons with finite soft momentum in hot QCD | We calculate the damping rate for transverse gluons with {\nineti finite}
soft momentum to leading order in perturbative hot QCD. The internal momenta of
the one-loop contributing diagrams are soft. This means we have to use
effective vertices and propagators which incorporate the so-called hard thermal
loops. We expan... | 9710549v2 |
1998-07-21 | An infrared singularity in the damping rate for longitudinal gluons in hot QCD | We calculate $\gamma_l(0)$, the damping rate for longitudinal on-shell gluons
with zero momentum in hot QCD using the hard-thermal-loop (htl) scheme. We find
it to be divergent in the infrared, which means that in this scheme
$\gamma_l(0)$ is different from $\gamma_t(0)$, the corresponding damping rate
for transverse g... | 9807439v2 |
1998-09-25 | Damping rates in the MSSM and electroweak baryogenesis | We present an analysis of the thermalization rate of Higgsinos and winos
based on the imaginary part of the two-point Green function in the {\it
unbroken} phase of the MSSM. We use improved propagators including resummation
of hard thermal loops and the thermalization rate is computed at the one-loop
level in the high ... | 9809529v1 |
2006-10-27 | The soft fermion dispersion relation at next-to-leading order in hot QED | We study next-to-leading order contributions to the soft static fermion
dispersion relation in hot QED. We derive an expression for the complete
next-to-leading order contribution to the retarded fermion self-energy. The
real and imaginary parts of this expression give the next-to-leading order
contributions to the mas... | 0610372v1 |
2007-03-26 | Preheating and Affleck-Dine leptogenesis after thermal inflation | Previously, we proposed a model of low energy Affleck-Dine leptogenesis in
the context of thermal inflation. The lepton asymmetry is generated at the end
of thermal inflation, which occurs at a relatively low energy scale with the
Hubble parameter somewhere in the range $1 \keV \lesssim H \lesssim 1 \MeV$.
Thus Hubble ... | 0703275v1 |
1996-03-14 | Dissipation and Topologically Massive Gauge Theories in Pseudoeuclidean Plane | In the pseudo-euclidean metrics Chern-Simons gauge theory in the infrared
region is found to be associated with dissipative dynamics. In the infrared
limit the Lagrangian of 2+1 dimensional pseudo-euclidean topologically massive
electrodynamics has indeed the same form of the Lagrangian of the damped
harmonic oscillato... | 9603092v1 |
2002-08-31 | Neutrino damping rate at finite temperature and density | A first principle derivation is given of the neutrino damping rate in
real-time thermal field theory. Starting from the discontinuity of the neutrino
self energy at the two loop level, the damping rate can be expressed as
integrals over space phase of amplitudes squared, weighted with statistical
factors that account f... | 0209006v1 |
2004-10-20 | Ergodicity for the weakly damped stochastic non-linear Schrödinger equations | We study a damped stochastic non-linear Schr\"{o}dinger (NLS) equation driven
by an additive noise. It is white in time and smooth in space. Using a coupling
method, we establish convergence of the Markovian transition semi-group toward
a unique invariant probability measure. This kind of method was originally
developp... | 0410443v2 |
2006-07-30 | Non-autonomous dynamics of wave equations with nonlinear damping and critical nonlinearity | The authors consider non-autonomous dynamical behavior of wave-type
evolutionary equations with nonlinear damping and critical nonlinearity. These
type of waves equations are formulated as non-autonomous dynamical systems
(namely, cocycles). A sufficient and necessary condition for the existence of
pullback attractors ... | 0607774v3 |
2000-09-28 | Quantization of Damped Harmonic Oscillator, Thermal Field Theories and q-Groups | We study the canonical quantization of the damped harmonic oscillator by
resorting to the realization of the q-deformation of the Weyl-Heisenberg
algebra (q-WH) in terms of finite difference operators. We relate the damped
oscillator hamiltonian to the q-WH algebra and to the squeezing generator of
coherent states theo... | 0009036v1 |
2001-11-14 | Soliton-radiation coupling in the parametrically driven, damped nonlinear Schrödinger equation | We use the Riemann-Hilbert problem to study the interaction of the soliton
with radiation in the parametrically driven, damped nonlinear Schr\"odinger
equation. The analysis is reduced to the study of a finite-dimensional
dynamical system for the amplitude and phase of the soliton and the complex
amplitude of the long-... | 0111034v1 |
2002-02-12 | Landau Damping and Coherent Structures in Narrow-Banded 1+1 Deep Water Gravity Waves | We study the nonlinear energy transfer around the peak of the spectrum of
surface gravity waves by taking into account nonhomogeneous effects. In the
narrow-banded approximation the kinetic equation resulting from a
nonhomogeneous wave field is a Vlasov-Poisson type equation which includes at
the same time the random v... | 0202026v1 |
2005-10-24 | Stability of a nonlinear oscillator with random damping | A noisy damping parameter in the equation of motion of a nonlinear oscillator
renders the fixed point of the system unstable when the amplitude of the noise
is sufficiently large. However, the stability diagram of the system can not be
predicted from the analysis of the moments of the linearized equation. In the
case o... | 0510063v1 |
2006-10-20 | Vibration of Generalized Double Well Oscillators | We have applied the Melnikov criterion to examine a global homoclinic
bifurcation and transition to chaos in a case of a double well dynamical system
with a nonlinear fractional damping term and external excitation. The usual
double well Duffing potential having a negative square term and positive
quartic term has been... | 0610052v1 |
1998-06-18 | Relativity Damps OPEP in Nuclear Matter | Using a relativistic Dirac-Brueckner analysis the OPEP contribution to the
ground state energy of nuclear matter is studied. In the study the pion is
derivative-coupled. We find that the role of the tensor force in the saturation
mechanism is substantially reduced compared to its dominant role in a usual
nonrelativisti... | 9806054v1 |
1999-07-05 | Damping of IVGDR - Fermi-liquid or Fermi-gas ? | Collisional relaxation rates of collective modes in nuclei are calculated
using the Levinson equation for the reduced density matrix with a memory
dependent collision term. Linearizing the collision integral two contribution
have to be distinguished, the one from the quasiparticle energy and the one
from occupation fac... | 9907012v1 |
2001-01-08 | Collisional Damping of Giant Monopole and Quadrupole Resonances | Collisional damping widths of giant monopole and quadrupole excitations for
$^{120}$Sn and $^{208}$Pb at zero and finite temperatures are calculated within
Thomas-Fermi approximation by employing the microscopic in-medium
cross-sections of Li and Machleidt and the phenomenological Skyrme and Gogny
forces, and are compa... | 0101016v1 |
1996-12-08 | Towards a Simple Model of Compressible Alfvenic Turbulence | A simple model collisionless, dissipative, compressible MHD (Alfvenic)
turbulence in a magnetized system is investigated. In contrast to more familiar
paradigms of turbulence, dissipation arises from Landau damping, enters via
nonlinearity, and is distributed over all scales. The theory predicts that two
different regi... | 9612005v2 |
1998-10-01 | Mode-coupling and nonlinear Landau damping effects in auroral Farley-Buneman turbulence | The fundamental problem of Farley-Buneman turbulence in the auroral
$E$-region has been discussed and debated extensively in the past two decades.
In the present paper we intend to clarify the different steps that the auroral
$E$-region plasma has to undergo before reaching a steady state. The
mode-coupling calculation... | 9810062v1 |
2000-08-20 | Fabrication and Tolerance Issues and their Influence on Multi-Bunch Bbu and Emittance Dilution in the Construction of X-Band RDDS Linacs for the NLC | The main linacs of the Next Linear Collider (NLC) will contain several
thousand X-band RDDS (Rounded Damped Detuned Structures). The transverse
wakefield in the structures is reduced by detuning the modal frequencies such
that they destructively interfere and by four damping manifolds per structure
which provide weak d... | 0008198v1 |
2003-09-17 | A New Damping Mechanism in Non-linear Bubble Dynamics | Non-linear equations of radial motion of a gas bubble in a compressible
viscous liquid have been modified considering effects of viscosity and
compressibility more complete than all previous works. A new set of equations
has been derived including new terms resulted from consideration of the
viscosity and compressibili... | 0309080v1 |
2003-11-26 | Eigenvector Expansion and Petermann Factor for Ohmically Damped Oscillators | Correlation functions $C(t) \sim <\phi(t)\phi(0)>$ in ohmically damped
systems such as coupled harmonic oscillators or optical resonators can be
expressed as a single sum over modes $j$ (which are not power-orthogonal), with
each term multiplied by the Petermann factor (PF) $C_j$, leading to "excess
noise" when $|C_j| ... | 0311127v2 |
2004-04-02 | DAFNE injection system upgrade | High luminosity in DAFNE needs very high electron and positron currents
stored. A full energy (510 MeV) injection system composed by a full energy
electron and positron linac and an accumulator-damping ring is presently used.
The electron and positron beams, alternatively accelerated by the linac, are
injected and stac... | 0404010v1 |
2004-05-05 | Langmuir wave self-focusing versus decay instability | Electron trapping in a finite amplitude Langmuir wave (LW) leads to a
frequency shift, \Delta\omega_{TP} < 0, and reduced Landau damping. These may
lead to modulational instability. Its growth rate and damping threshold, due to
escape of trapped electrons at rate \nu, are calculated for the first time in
the short wave... | 0405015v1 |
2005-06-16 | Mesoscale Quantization and Self-Organized Stability | In the world of technology, one of the most important forms of friction is
that of rolling friction. Yet it is one of the least studied of all the known
forms of energy dissipation. In the present experiments we investigate the
oscillatory free-decay of a rigid cube, whose side-length is less than the
diameter of the r... | 0506143v1 |
2006-10-31 | Ultimate parameters of the photon collider at the ILC | At linear colliders, the e+e- luminosity is limited by beam-collision
effects, which determine the required emittances of beams in damping rings
(DRs). While in gamma-gamma collisions at the photon collider, these effects
are absent, and so smaller emittances are desirable. In present damping rings
designs, nominal DR ... | 0610285v1 |
2006-04-27 | On the weak solutions of the McKendrick equation: Existence of demography cycles | We develop the qualitative theory of the solutions of the McKendrick partial
differential equation of population dynamics. We calculate explicitly the weak
solutions of the McKendrick equation and of the Lotka renewal integral equation
with time and age dependent birth rate. Mortality modulus is considered age
dependen... | 0604035v2 |
1999-03-05 | Exact Diagonalization of Two Quantum Models for the Damped Harmonic Oscillator | The damped harmonic oscillator is a workhorse for the study of dissipation in
quantum mechanics. However, despite its simplicity, this system has given rise
to some approximations whose validity and relation to more refined descriptions
deserve a thorough investigation. In this work, we apply a method that allows
us to... | 9903022v2 |
1999-04-06 | Nonclassical correlations in damped quantum solitons | Using cumulant expansion in Gaussian approximation, the internal quantum
statistics of damped soliton-like pulses in Kerr media are studied numerically,
considering both narrow and finite bandwidth spectral pulse components. It is
shown that the sub-Poissonian statistics can be enhanced, under certain
circumstances, by... | 9904017v2 |
1999-04-19 | Quantum theory of fluctuations in a cold damped accelerometer | We present a quantum network approach to real high sensitivity measurements.
Thermal and quantum fluctuations due to active as well as passive elements are
taken into account. The method is applied to the analysis of the capacitive
accelerometer using the cold damping technique, developed for fundamental
physics in spa... | 9904073v2 |
2000-07-04 | Stochastic limit approximation for rapidly decaying systems | The stochastic limit approximation method for ``rapid'' decay is presented,
where the damping rate \gamma is comparable to the system frequency \Omega,
i.e., \gamma \sim \Omega, whereas the usual stochastic limit approximation is
applied only to the weak damping situation \gamma << \Omega. The key formulas
for rapid de... | 0007007v2 |
2000-08-01 | Full mechanical characterization of a cold damped mirror | We describe an experiment in which we have used a cold damping feedback
mechanism to reduce the thermal noise of a mirror around its mechanical
resonance frequency. The monitoring of the brownian motion of the mirror allows
to apply an additional viscous force without any thermal fluctuations
associated. This scheme ha... | 0008004v1 |
2003-11-05 | Exact decoherence to pointer states in free open quantum systems is universal | In this paper it is shown that exact decoherence to minimal uncertainty
Gaussian pointer states is generic for free quantum particles coupled to a heat
bath. More specifically, the paper is concerned with damped free particles
linearly coupled under product initial conditions to a heat bath at arbitrary
temperature, wi... | 0311022v3 |
2004-07-30 | Kraus representation of damped harmonic oscillator and its application | By definition, the Kraus representation of a harmonic oscillator suffering
from the environment effect, modeled as the amplitude damping or the phase
damping, is directly given by a simple operator algebra solution. As examples
and applications, we first give a Kraus representation of a single qubit whose
computational... | 0407263v2 |
2005-01-31 | The non dissipative damping of the Rabi oscillations as a "which-path" information | Rabi oscillations may be viewed as an interference phenomenon due to a
coherent superposition of different quantum paths, like in the Young's two-slit
experiment. The inclusion of the atomic external variables causes a non
dissipative damping of the Rabi oscillations. More generally, the atomic
translational dynamics i... | 0501181v1 |
2006-01-12 | Driven harmonic oscillator as a quantum simulator for open systems | We show theoretically how a driven harmonic oscillator can be used as a
quantum simulator for non-Markovian damped harmonic oscillator. In the general
framework, the results demonstrate the possibility to use a closed system as a
simulator for open quantum systems. The quantum simulator is based on sets of
controlled d... | 0601081v2 |
2006-07-31 | Nonadiabatic Transitions for a Decaying Two-Level-System: Geometrical and Dynamical Contributions | We study the Landau-Zener Problem for a decaying two-level-system described
by a non-hermitean Hamiltonian, depending analytically on time. Use of a
super-adiabatic basis allows to calculate the non-adiabatic transition
probability P in the slow-sweep limit, without specifying the Hamiltonian
explicitly. It is found th... | 0607221v1 |
2007-05-05 | Damped Corrections to Inflationary Spectra from a Fluctuating Cutoff | We reconsider trans-Planckian corrections to inflationary spectra by taking
into account a physical effect which has been overlooked and which could have
important consequences. We assume that the short length scale characterizing
the new physics is endowed with a finite width, the origin of which could be
found in qua... | 0705.0747v1 |
2007-05-10 | Magnetization oscillations induced by a spin-polarized current in a point-contact geometry: mode hopping and non-linear damping effects | In this paper we study magnetization excitations induced in a thin extended
film by a spin-polarized dc-current injected through a point contact in the
current-perpendicular-to-plane (CPP) geometry. Using full-scale micromagnetic
simulations, we demonstrate that in addition to the oscillations of the
propagating wave t... | 0705.1515v1 |
2007-05-27 | Amplitude Damping for single-qubit System with single-qubit mixed-state Environment | We study a generalized amplitude damping channel when environment is
initially in the single-qubit mixed state. Representing the affine
transformation of the generalized amplitude damping by a three-dimensional
volume, we plot explicitly the volume occupied by the channels simulatable by a
single-qubit mixed-state envi... | 0705.3952v3 |
2007-06-01 | The geometrical quantity in damped wave equations on a square | The energy in a square membrane $\Omega$ subject to constant viscous damping
on a subset $\omega\subset \Omega$ decays exponentially in time as soon as
$\omega$ satisfies a geometrical condition known as the "Bardos-Lebeau-Rauch"
condition. The rate $\tau(\omega)$ of this decay satisfies $\tau(\omega)= 2
\min(-\mu(\ome... | 0706.0172v1 |
2007-06-08 | Kinetic-Ion Simulations Addressing Whether Ion Trapping Inflates Stimulated Brillouin Backscattering Reflectivities | An investigation of the possible inflation of stimulated Brillouin
backscattering (SBS) due to ion kinetic effects is presented using
electromagnetic particle simulations and integrations of three-wave
coupled-mode equations with linear and nonlinear models of the nonlinear ion
physics. Electrostatic simulations of lin... | 0706.1236v1 |
2007-06-29 | Driving-dependent damping of Rabi oscillations in two-level semiconductor systems | We propose a mechanism to explain the nature of the damping of Rabi
oscillations with increasing driving-pulse area in localized semiconductor
systems, and have suggested a general approach which describes a coherently
driven two-level system interacting with a dephasing reservoir. Present
calculations show that the no... | 0706.4372v1 |
2007-08-06 | Collisionsless amplifying of longitudinal electron waves in two-stream plasma | To better understanding the principal features of collisionless
damping/growing plasma waves we have implemented a demonstrative calculation
for the simplest cases of electron waves in two-stream plasmas with the
delta-function type electron velocity distribution function of each of the
streams with velocities v(1) and... | 0708.0767v1 |
2007-08-09 | The Highly Damped Quasinormal Modes of Extremal Reissner-Nordström and Reissner-Nordström-de Sitter Black Holes | We analyze in detail the highly damped quasinormal modes of $D$-dimensional
extremal Reissner-Nordstr$\ddot{\rm{o}}$m and
Reissner-Nordstr$\ddot{\rm{o}}$m-de Sitter black holes. We only consider the
extremal case where the event horizon and the Cauchy inner horizon coincide. We
show that, even though the topology of th... | 0708.1333v2 |
2007-08-28 | Resonantly damped surface and body MHD waves in a solar coronal slab with oblique propagation | The theory of magnetohydrodynamic (MHD) waves in solar coronal slabs in a
zero-$\beta$ configuration and for parallel propagation of waves does not allow
the existence of surface waves. When oblique propagation of perturbations is
considered both surface and body waves are able to propagate. When the
perpendicular wave... | 0708.3783v1 |
2007-09-11 | Teleportation of qubit states through dissipative channels: Conditions for surpassing the no-cloning limit | We investigate quantum teleportation through dissipative channels and
calculate teleportation fidelity as a function of damping rates. It is found
that the average fidelity of teleportation and the range of states to be
teleported depend on the type and rate of the damping in the channel. Using the
fully entangled frac... | 0709.1662v1 |
2007-10-03 | Global stability of travelling fronts for a damped wave equation with bistable nonlinearity | We consider the damped wave equation \alpha u_tt + u_t = u_xx - V'(u) on the
whole real line, where V is a bistable potential. This equation has travelling
front solutions of the form u(x,t) = h(x-st) which describe a moving interface
between two different steady states of the system, one of which being the
global mini... | 0710.0794v1 |
2007-12-19 | Cosmic String Dynamics and Evolution in Warped Spacetime | We study the dynamics and evolution of Nambu-Goto strings in a warped
spacetime, where the warp factor is a function of the internal coordinates
giving rise to a `throat' region. The microscopic equations of motion for
strings in this background include potential and friction terms, which attract
the strings towards th... | 0712.3224v2 |
2007-12-20 | The Critical Exponent of the Fractional Langevin Equation is $α_c\approx 0.402$ | We investigate the dynamical phase diagram of the fractional Langevin
equation and show that critical exponents mark dynamical transitions in the
behavior of the system. For a free and harmonically bound particle the critical
exponent $\alpha_c= 0.402\pm 0.002$ marks a transition to a non-monotonic
under-damped phase. ... | 0712.3407v1 |
2008-01-24 | Particle Acceleration by Fast Modes in Solar Flares | We address the problem of particle acceleration in solar flares by fast modes
which may be excited during the reconnection and undergo cascade and are
subjected to damping. We extend the calculations beyond quasilinear
approximation and compare the acceleration and scattering by transit time
damping and gyroresonance i... | 0801.3786v2 |
2008-02-07 | Analysis of squeal noise and mode coupling instabilities including damping and gyroscopic effects | This paper deals with an audible disturbance known as automotive clutch
squeal noise from the viewpoint of friction-induced mode coupling instability.
Firstly, an auto-coupling model is presented showing a non-conservative
circulatory effect originating from friction forces. Secondly, the stability of
an equilibrium is... | 0802.0923v1 |
2008-02-12 | Nonlinear Saturation of g-modes in Proto-Neutron Stars: Quieting the Acoustic Engine | According to Burrows et al.'s acoustic mechanism for core-collapse supernova
explosions, the primary, l=1, g-mode in the core of the proto-neutron star is
excited to an energy of ~ 10^{50} ergs and damps by the emission of sound
waves. Here we calculate the damping of the primary mode by the parametric
instability, i.e... | 0802.1522v3 |
2008-02-21 | Gas Damping Coefficient Research for MEMS Comb Linear Vibration Gyroscope | Silicon-MEMS gyroscope is an important part of MEMS (Micro Electrical
Mechanical System). There are some disturb ignored in traditional gyroscope
that must be evaluated newly because of its smaller size (reach the level of
micron). In these disturb, the air pressure largely influences the performance
of MEMS gyroscope.... | 0802.3048v1 |
2008-03-03 | Damped harmonic oscillator interpretation of the soft-state power spectra of Cyg X-1 | We develop a model of an accretion disc in which the variability induced at a
given radius is governed by a damped harmonic oscillator at the corresponding
epicyclic frequency. That variability induces both linear and non-linear
responses in the locally emitted radiation. The total observed variability of a
source is t... | 0803.0238v2 |
2008-03-05 | The Secular Evolution of a Close Ring-Satellite System: The Excitation of Spiral Density Waves at a Nearby Gap Edge | The Lagrange planetary equations are used to study to secular evolution of a
small, eccentric satellite that orbits within a narrow gap in a broad,
self-gravitating planetary ring. These equations show that the satellite's
secular perturbations of the ring will excite a very long-wavelength spiral
density wave that pro... | 0803.0576v1 |
2008-03-06 | Hypersound damping in vitreous silica measured by picosecond acoustics | The attenuation of longitudinal acoustic phonons up to frequencies nearing
250 GHz is measured in vitreous silica with a picosecond optical technique.
Taking advantage of interferences on the probe beam, difficulties encountered
in early pioneering experiments are alleviated. Sound damping at 250 GHz and
room temperatu... | 0803.0832v1 |
2008-03-07 | Resonance distribution in open quantum chaotic systems | In order to study the resonance spectra of chaotic cavities subject to some
damping (which can be due to absorption or partial reflection at the
boundaries), we use a model of damped quantum maps. In the high-frequency
limit, the distribution of (quantum) decay rates is shown to cluster near a
``typical'' value, which ... | 0803.1075v4 |
2008-04-03 | Single flux quantum circuits with damping based on dissipative transmission lines | We propose and demonstrate the functioning of a special Rapid Single Flux
Quantum (RSFQ) circuit with frequency-dependent damping. This damping is
achieved by shunting individual Josephson junctions by pieces of open-ended RC
transmission lines. Our circuit includes a toggle flip-flop cell, Josephson
transmission lines... | 0804.0442v1 |
2008-05-14 | Reconciling results of LSND, MiniBooNE and other experiments with soft decoherence | We propose an explanation of the LSND signal via quantum-decoherence of the
mass states, which leads to damping of the interference terms in the
oscillation probabilities. The decoherence parameters as well as their energy
dependence are chosen in such a way that the damping affects only oscillations
with the large (at... | 0805.2098v1 |
2008-06-02 | Observations of Solar Doppler Shift Oscillations with the EUV Imaging Spectrometer on Hinode | Damped Doppler shift oscillations have been observed in emission lines from
ions formed at flare temperatures with the Solar Ultraviolet Measurements of
Emitted Radiation spectrometer on the Solar and Heliospheric Observatory and
with the Bragg Crystal Spectrometer on Yohkoh. This Letter reports the
detection of low-am... | 0806.0265v1 |
2008-07-07 | Using squeezed field to preserve two-atom entanglement against spontaneous emissions | Tunable interaction between two atoms in a cavity is realized by interacting
the two atoms with an extra controllable single-mode squeezed field. Such a
controllable interaction can be further used to control entanglement between
the two atoms against amplitude damping decoherence caused by spontaneous
emissions. For t... | 0807.0965v2 |
2008-07-17 | Connecting high-redshift galaxy populations through observations of local Damped Lyman Alpha dwarf galaxies | I report on observations of the z=0.01 dwarf galaxy SBS1543+593 which is
projected onto the background QSO HS1543+5921. As a star-forming galaxy first
noted in emission, this dwarf is playing a pivotal role in our understanding of
high-redshift galaxy populations, because it also gives rise to a Damped Lyman
Alpha syst... | 0807.2853v1 |
2008-07-23 | Damped driven coupled oscillators: entanglement, decoherence and the classical limit | The interaction of (two-level) Rydberg atoms with dissipative QED cavity
fields can be described classically or quantum mechanically, even for very low
temperatures and mean number of photons, provided the damping constant is large
enough. We investigate the quantum-classical border, the entanglement and
decoherence of... | 0807.3715v1 |
2008-07-26 | A Monte Carlo Method for Modeling Thermal Damping: Beyond the Brownian-Motion Master Equation | The "standard" Brownian motion master equation, used to describe thermal
damping, is not completely positive, and does not admit a Monte Carlo method,
important in numerical simulations. To eliminate both these problems one must
add a term that generates additional position diffusion. He we show that one
can obtain a c... | 0807.4211v3 |
2008-07-31 | Finite-dimensional attractors for the quasi-linear strongly-damped wave equation | We present a new method of investigating the so-called quasi-linear strongly
damped wave equations $$ \partial_t^2u-\gamma\partial_t\Delta_x u-\Delta_x
u+f(u)= \nabla_x\cdot \phi'(\nabla_x u)+g $$ in bounded 3D domains. This method
allows us to establish the existence and uniqueness of energy solutions in the
case wher... | 0807.5078v1 |
2008-08-01 | Field-Driven Domain-Wall Dynamics in GaMnAs Films with Perpendicular Anisotropy | We combine magneto-optical imaging and a magnetic field pulse technique to
study domain wall dynamics in a ferromagnetic (Ga,Mn)As layer with
perpendicular easy axis. Contrary to ultrathin metallic layers, the depinning
field is found to be smaller than the Walker field, thereby allowing for the
observation of the stea... | 0808.0119v1 |
2008-08-11 | Effect of frequency and temperature on microwave-induced magnetoresistance oscillations in two-dimensional electron systems | Experimental results on microwave-induced magnetoresistance oscillation in
two-dimensional electron systems show a similar behavior of these systems
regarding temperature and microwave frequency. It is found that these
oscillations tend to quench when frequency or temperature increase, approaching
magnetoresistance to ... | 0808.1489v1 |
2008-11-13 | Higher order energy decay rates for damped wave equations with variable coefficients | Under appropriate assumptions the energy of wave equations with damping and
variable coefficients $c(x)u_{tt}-\hbox{div}(b(x)\nabla u)+a(x)u_t =h(x)$ has
been shown to decay. Determining the rate of decay for the higher order
energies involving the $k$th order spatial and time derivatives has been an
open problem with ... | 0811.2159v1 |
2009-01-12 | Nonlinear Wigner solid transport over superfluid helium under AC conditions | Nonlinear transport properties of the two-dimensional Wigner solid of surface
electrons on superfluid helium are studied for alternating current conditions.
For time-averaged quantities like Fourier coefficients, the field-velocity
characteristics are shown to be qualitatively different as compared to that
found in the... | 0901.1508v1 |
2009-01-14 | Brownian motion with respect to time-changing Riemannian metrics, applications to Ricci flow | We generalize Brownian motion on a Riemannian manifold to the case of a
family of metrics which depends on time. Such questions are natural for
equations like the heat equation with respect to time dependent Laplacians
(inhomogeneous diffusions). In this paper we are in particular interested in
the Ricci flow which pro... | 0901.1999v2 |
2009-01-15 | The sound damping constant for generalized theories of gravity | The near-horizon metric for a black brane in Anti-de Sitter (AdS) space and
the metric near the AdS boundary both exhibit hydrodynamic behavior. We
demonstrate the equivalence of this pair of hydrodynamic systems for the sound
mode of a conformal theory. This is first established for Einstein's gravity,
but we then sho... | 0901.2191v1 |
2009-01-26 | Damping of sound waves in superfluid nucleon-hyperon matter of neutron stars | We consider sound waves in superfluid nucleon-hyperon matter of massive
neutron-star cores. We calculate and analyze the speeds of sound modes and
their damping times due to the shear viscosity and non-equilibrium weak
processes of particle transformations. For that, we employ the dissipative
relativistic hydrodynamics... | 0901.4108v1 |
2009-03-02 | Attenuation and damping of electromagnetic fields: Influence of inertia and displacement current | New results for attenuation and damping of electromagnetic fields in rigid
conducting media are derived under the conjugate influence of inertia due to
charge carriers and displacement current. Inertial effects are described by a
relaxation time for the current density in the realm of an extended Ohm's law.
The classic... | 0903.0210v1 |
2009-04-06 | Scrutinizing single-qubit quantum channels: Theory and experiment with trapped ions | We report experimental implementation of various types of qubit channels
using an individual trapped ion. We analyzed experimental data and we performed
tomographic reconstruction of quantum channels based on these data.
Specifically, we studied phase damping channels, where the damping acts either
in the xy-plane of t... | 0904.0923v1 |
2009-05-13 | Time-dependent barrier passage of Two-dimensional non-Ohmic damping system | The time-dependent barrier passage of an anomalous damping system is studied
via the generalized Langevin equation (GLE) with non-Ohmic memory damping
friction tensor and corresponding thermal colored noise tensor describing a
particle passing over the saddle point of a two-dimensional quadratic potential
energy surfac... | 0905.2074v1 |
2009-06-04 | Viscous cavity damping of a microlever in a simple fluid | We consider the problem of oscillation damping in air of a thermally actuated
microlever as it is gradually approached towards an infinite wall in parallel
geometry. As the gap is decreased from 20 nm down to 400 nm, we observe the
increasing damping of the lever Brownian motion in the fluid laminar regime.
This manife... | 0906.0782v1 |
2009-06-19 | Wakefield damping for the CLIC crab cavity | A crab cavity is required in the CLIC to allow effective head-on collision of
bunches at the IP. A high operating frequency is preferred as the deflection
voltage required for a given rotation angle and the RF phase tolerance for a
crab cavity are inversely proportional to the operating frequency. The short
bunch spaci... | 0906.3593v1 |
2009-07-06 | Non-Fermi liquid behavior due to U(1) gauge field in two dimensions | We study the damping rate of massless Dirac fermions due to the U(1) gauge
field in (2+1)-dimensional quantum electrodynamics. In the absence of a Maxwell
term for the gauge field, the fermion damping rate
$\mathrm{Im}\Sigma(\omega,T)$ is found to diverge in both perturbative and
self-consistent results. In the presenc... | 0907.1022v3 |
2009-07-30 | Gas damping force noise on a macroscopic test body in an infinite gas reservoir | We present a simple analysis of the force noise associated with the
mechanical damping of the motion of a test body surrounded by a large volume of
rarefied gas. The calculation is performed considering the momentum imparted by
inelastic collisions against the sides of a cubic test mass, and for other
geometries for wh... | 0907.5375v2 |
2009-08-19 | Nonlinear viscoelastic wave propagation: an extension of Nearly Constant Attenuation (NCQ) models | Hysteretic damping is often modeled by means of linear viscoelastic
approaches such as "nearly constant Attenuation (NCQ)" models. These models do
not take into account nonlinear effects either on the stiffness or on the
damping, which are well known features of soil dynamic behavior. The aim of
this paper is to propos... | 0908.2715v2 |
2009-08-26 | Influence of an external magnetic field on forced turbulence in a swirling flow of liquid metal | We report an experimental investigation on the influence of an external
magnetic field on forced 3D turbulence of liquid gallium in a closed vessel. We
observe an exponential damping of the turbulent velocity fluctuations as a
function of the interaction parameter N (ratio of Lorentz force over inertial
terms of the Na... | 0908.3821v1 |
2009-09-30 | Electronic damping of molecular motion at metal surfaces | A method for the calculation of the damping rate due to electron-hole pair
excitation for atomic and molecular motion at metal surfaces is presented. The
theoretical basis is provided by Time Dependent Density Functional Theory
(TDDFT) in the quasi-static limit and calculations are performed within a
standard plane-wav... | 0909.5495v1 |
2009-10-14 | Constraint on the growth factor of the cosmic structure from the damping of the baryon acoustic oscillation signature | We determine a constraint on the growth factor by measuring the damping of
the baryon acoustic oscillations in the matter power spectrum using the Sloan
Digital Sky Survey luminous red galaxy sample. The damping of the BAO is
detected at the one sigma level. We obtain \sigma_8D_1(z=0.3) =
0.42^{+0.34}_{-0.28} at the 1\... | 0910.2513v1 |
2009-10-27 | On the Interpretation of Magnetic Helicity Signatures in the Dissipation Range of Solar Wind Turbulence | Measurements of small-scale turbulent fluctuations in the solar wind find a
non-zero right-handed magnetic helicity. This has been interpreted as evidence
for ion cyclotron damping. However, theoretical and empirical evidence suggests
that the majority of the energy in solar wind turbulence resides in low
frequency ani... | 0910.5023v1 |
2009-12-08 | Coupling Photosphere and Corona: Linear and Turbulent Regimes | In a recent work Grappin et al. [1] have shown that low- frequency movements
can be transmitted from one footpoint to the other along a magnetic loop, thus
mimicking a friction effect of the corona on the photosphere, and invalidating
the line-tying approximation. We consider here successively the effect of high
freque... | 0912.1497v1 |
2009-12-16 | The role of $r$-mode damping in the thermal evolution of neutron stars | The thermal evolution of neutron stars (NSs) is investigated by coupling with
the evolution of $\textit{r}$-mode instability that is described by a second
order model.The heating effect due to shear viscous damping of the
$\textit{r}$-modes enables us to understand the high temperature of two young
pulsars (i.e., PSR B... | 0912.3052v1 |
2009-12-25 | Noisy non-transitive quantum games | We study the effect of quantum noise in 3 by 3 entangled quantum games. By
considering different noisy quantum channels we analyze that how a two-player,
three-strategy Rock-Scissor-Paper game is influenced by the quantum noise. We
consider the winning non-transitive strategies R, S and P such as R beats S, S
beats P, ... | 0912.4961v1 |
2010-01-26 | Damping in high-frequency metallic nanomechanical resonators | We have studied damping in polycrystalline Al nanomechanical resonators by
measuring the temperature dependence of their resonance frequency and quality
factor over a temperature range of 0.1 - 4 K. Two regimes are clearly
distinguished with a crossover temperature of 1 K. Below 1 K we observe a
logarithmic temperature... | 1001.4612v1 |
2010-04-28 | Inviscid dynamical structures near Couette flow | Consider inviscid fluids in a channel {-1<y<1}. For the Couette flow
v_0=(y,0), the vertical velocity of solutions to the linearized Euler equation
at v_0 decays in time. At the nonlinear level, such inviscid damping has not
been proved. First, we show that in any (vorticity) H^{s}(s<(3/2)) neighborhood
of Couette flow... | 1004.5149v1 |
2010-06-14 | Parallel electric field amplification by phase-mixing of Alfven waves | Previous numerical studies have identified "phase mixing" of low-frequency
Alfven waves as a mean of parallel electric field amplification and
acceleration of electrons in a collisionless plasma. Theoretical explanations
are given of how this produces an amplification of the parallel electric field,
and as a consequenc... | 1006.2729v1 |
2010-07-19 | Anomalously large damping of long-wavelength quasiparticles caused by long-range interaction | We demonstrate that long-range interaction in a system can lead to a very
strong interaction between long-wavelength quasiparticles and make them heavily
damped. In particular, we discuss magnon spectrum using 1/S expansion in 3D
Heisenberg ferromagnet (FM) with arbitrary small dipolar forces at T<<T_C. We
obtain that ... | 1007.3081v2 |
2010-07-29 | The Quasinormal Mode Spectrum of a Kerr Black Hole in the Eikonal Limit | It is well established that the response of a black hole to a generic
perturbation is characterized by a spectrum of damped resonances, called
quasinormal modes; and that, in the limit of large angular momentum ($l \gg
1$), the quasinormal mode frequency spectrum is related to the properties of
unstable null orbits. In... | 1007.5097v1 |
2010-08-30 | Caldeira-Leggett Model, Landau Damping, and the Vlasov-Poisson System | The Caldeira-Leggett Hamiltonian (Eq. (1) below) describes the interaction of
a discrete harmonic oscillator with a continuous bath of harmonic oscillators.
This system is a standard model of dissipation in macroscopic low temperature
physics, and has applications to superconductors, quantum computing, and
macroscopic ... | 1008.5190v1 |
2010-09-09 | A number-conserving linear response study of low-velocity ion stopping in a collisional magnetized classical plasma | The results of a theoretical investigation on the low-velocity stopping power
of the ions moving in a magnetized collisional plasma are presented. The
stopping power for an ion is calculated employing linear response theory using
the dielectric function approach. The collisions, which leads to a damping of
the excitati... | 1009.1700v1 |
2010-10-03 | A High Phase Advance Damped and Detuned Structure for the Main Linacs of Clic | The main accelerating structures for the CLIC are designed to operate at an
average accelerating gradient of 100 MV/m. The accelerating frequency has been
optimised to 11.994 GHz with a phase advance of 2{\pi}/3 of the main
accelerating mode. The moderately damped and detuned structure (DDS) design is
being studied as ... | 1010.0438v1 |
2010-10-23 | Environmental influences on Quantum Monty Hall problem | We reformulate the quantum Monty Hall problem in the presence of decoherence.
The decoherence destroys the fairness of the game. A new Nash equilibrium for a
particular strategy profile in the presence of decoherence emerges. It is shown
that in the presence of decoherence under the action of amplitude damping
channel,... | 1010.4875v2 |
2010-12-14 | Controlling transfer of quantum correlations among bi-partitions of a composite quantum system by combining noisy environments | The correlation dynamics is investigated for various bi-partitions of a
composite system consisting of two qubits, and two independent and
non-identical noisy environments. The two qubits have no direct interaction
with each other and locally interact with their environments. Classical and
quantum correlations includin... | 1012.3033v1 |
2010-12-22 | Viscous damping of r-modes: Small amplitude instability | We study the viscous damping of r-modes of compact stars and analyze in
detail the regions where small amplitude modes are unstable to the emission of
gravitational radiation. We present general expressions for the viscous damping
times for arbitrary forms of interacting dense matter and derive general
semi-analytic re... | 1012.4883v2 |
2010-12-27 | Phenomenology of Current-Induced Dynamics in Antiferromagnets | We derive a phenomenological theory of current-induced staggered
magnetization dynamics in antiferromagnets. The theory captures the reactive
and dissipative current-induced torques and the conventional effects of
magnetic fields and damping. A Walker ansatz describes the dc current-induced
domain-wall motion when ther... | 1012.5655v2 |
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