publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2008-06-12 | Towards the description of anisotropic plasma at strong coupling | We initiate a study of anisotropic plasma at strong coupling using the
AdS/CFT correspondence. We construct an exact dual geometry which represents a
static uniform but anisotropic system and find, that although it is singular,
it allows for a notion of `incoming' boundary conditions. We study small
fluctuations around... | 0806.2141v2 |
2008-06-19 | Enhancement of sudden death of entanglement for driven qubits | We study the recently discovered phenomena of sudden death of entanglement
for a system of two qubits, each of them independently longitudinally damped by
a reservoir and subjected to a continuous driving. We show that driving
produces, in the interaction picture, an effective bath that has elements
amounting to variou... | 0806.3186v1 |
2008-06-19 | Negative dimensional approach to evaluating real integrals | In solving the differential equation for a non damped harmonic oscillator one
meets, after subjecting the equation to a Fourier transformation, an
integration in the complex $\omega$ plane. In most cases such an integral is
evaluated by calculating residues together with some physical input such as the
principle of cau... | 0806.3216v1 |
2008-06-20 | Rabi model beyond the rotating wave approximation: generation of photons from vacuum through decoherence | We study numerically the dynamics of the Rabi Hamiltonian, describing the
interaction of a single cavity mode and a two-level atom without the rotating
wave approximation, subjected to damping and dephasing reservoirs included via
usual Lindblad superoperators in the master equation. We show that the
combination of the... | 0806.3475v1 |
2008-06-24 | A Gear-like Predictor-Corrector method for Brownian Dynamics Simulation | We introduce a Predictor-Corrector type method suitable for performing
many-particle Brownian Dynamics simulations. Since the method goes over to the
Gear's method for Molecular Dynamics simulation in the limit of vanishing
friction, we refer to it as a Gear-like algorithm. The algorithm has been
tested on a one-dimens... | 0806.3912v2 |
2008-06-25 | Modulated Inflation (@SUSY08) | We consider cosmological perturbations caused by modulated inflaton velocity.
During inflation, the inflaton motion is damped and the velocity is determined
by the parameters such as couplings or masses that may depend on light
fields(moduli). The number of e-foldings is different in different patches if
there are spat... | 0806.4065v1 |
2008-06-30 | Superfluidity near phase separation in Bose-Fermi mixtures | We study the transition to fermion pair superfluidity in a mixture of
interacting bosonic and fermionic atoms. The fermion interaction induced by the
bosons and the dynamical screening of the condensate phonons due to fermions
are included using the nonperturbative Hamiltonian flow equations. We determine
the bosonic s... | 0807.0002v2 |
2008-07-10 | Multiplicative Noise Induces Zero Critical Frequency | Stochastic Bloch equations which model the fluorescence of two level
molecules and atoms, NMR experiments and Josephson junctions are investigated
to illustrate the profound effect of multiplicative noise on the critical
frequency of a dynamical system. Using exact solutions and the cumulant
expansion we find two main ... | 0807.1585v1 |
2008-07-16 | Decay of a metastable state activated by non-Gaussian noise: A critical review of the generalized Kramers problem | We review the problem of the noise activated escape from a metastable state
in the presence of non-Gaussian noise, and present connections between various
theoretical approaches. We also respond to criticism of our work by Tom\'a\v{s}
Novotn\'y [arXiv:0807.0387] concerning the weak damping limit. The discrepancy
betwee... | 0807.2675v1 |
2008-07-18 | Current-induced dynamics of spiral magnet | We study the dynamics of the spiral magnet under the charge current by
solving the Landau-Lifshitz-Gilbert equation numerically. In the steady state,
the current ${\vec j}$ induces (i) the parallel shift of the spiral pattern
with velocity $v=(\beta/\alpha)j$ ($\alpha$, $\beta$: the Gilbert damping
coefficients), (ii) ... | 0807.2901v1 |
2008-08-04 | Short Pulse Dynamics in Strongly Nonlinear Dissipative Granular Chains | We study the energy decay properties of a pulse propagating in a strongly
nonlinear granular chain with damping proportional to the relative velocity of
the grains. We observe a wave disturbance that at low viscosities consists of
two parts exhibiting two entirely different time scales of dissipation. One
part is an at... | 0808.0527v1 |
2008-08-11 | Persistence of zero modes in a gauged Dirac model for bilayer graphene | A recently constructed model for low lying excitations in bilayer graphene
exhibits mid-gap, zero energy modes in its Dirac-like spectrum, when a scalar
order parameter takes a vortex profile. We show that these modes persist when
the dynamics is extended by a gauge field interaction, which also renders
finite the vort... | 0808.1562v1 |
2008-08-14 | Planar Heterostructure Graphene -- Narrow-Gap Semiconductor -- Graphene | We investigate a planar heterostructure composed of two graphene films
separated by a narrow-gap semiconductor ribbon. We show that there is no the
Klein paradox when the Dirac points of the Brillouin zone of graphene are in a
band gap of a narrow-gap semiconductor. There is the energy range depending on
an angle of in... | 0808.1981v2 |
2008-08-15 | Asymptotic behavior of the mean square displacement of the Brownian parametric oscillator near the singular point | A parametric oscillator with damping driven by white noise is studied. The
mean square displacement (MSD) in the long-time limit is derived analytically
for the case that the static force vanishes, which was not treated in the past
work \cite{tashiro07}. The formula is asymptotic but is applicable to a general
periodic... | 0808.2207v3 |
2008-08-29 | Kramers Theory for Conformational Transitions of Macromolecules | We consider the application of Kramers theory to the microscopic calculation
of rates of conformational transitions of macromolecules. The main difficulty
in such an approach is to locate the transition state in a huge configuration
space. We present a method which identifies the transition state along the most
probabl... | 0809.0027v1 |
2008-09-19 | Predicting spin of compact objects from their QPOs: A global QPO model | We establish a unified model to explain Quasi-Periodic-Oscillation (QPO)
observed from black hole and neutron star systems globally. This is based on
the accreting systems thought to be damped harmonic oscillators with higher
order nonlinearity. The model explains multiple properties parallelly
independent of the natur... | 0809.3336v1 |
2008-09-21 | Stochastic Resonance in the Fermi-Pasta-Ulam Chain | We consider a damped $\beta$-Fermi-Pasta-Ulam chain, driven at one boundary
subjected to stochastic noise. It is shown that, for a fixed driving amplitude
and frequency, increasing the noise intensity, the system's energy resonantly
responds to the modulating frequency of the forcing signal. Multiple peaks
appear in th... | 0809.3604v1 |
2008-09-23 | Application of the Lifshitz theory to poor conductors | The Lifshitz formula for the dispersive forces is generalized to the
materials, which cannot be described with the local dielectric response.
Principal nonlocality of poor conductors is related with the finite screening
length of the penetrating field and the collisional relaxation; at low
temperatures the role of coll... | 0809.3901v1 |
2008-09-26 | On a possible connection between Chandler wobble and dark matter | Chandler wobble excitation and damping, one of the open problems in
geophysics, is treated as a consequence in part of the interaction between
Earth and a hypothetical oblate ellipsoid made of dark matter. The physical and
geometrical parameters of such an ellipsoid and the interacting torque strength
is calculated in ... | 0809.4506v3 |
2008-09-26 | The effects of twisted magnetic field on coronal loops oscillations and dissipation | The standing MHD modes in a zero-$\beta$ cylindrical magnetic flux tube
modelled as a straight core surrounded by a magnetically twisted annulus, both
embedded in a straight ambient external field is considered. The dispersion
relation for the fast MHD waves is derived and solved numerically to obtain the
frequencies o... | 0809.4611v1 |
2008-10-01 | Estimating Speed and Damping in the Stochastic Wave Equation | A parameter estimation problem is considered for a one-dimensional stochastic
wave equation driven by additive space-time Gaussian white noise.
The estimator is of spectral type and utilizes a finite number of the spatial
Fourier coefficients of the solution. The asymptotic properties of the
estimator are studied as ... | 0810.0046v1 |
2008-10-11 | Asymptotic Behavior of Stochastic Wave Equations with Critical Exponents on R^3 | The existence of a random attractor in H^1(R^3) \times L^2(R^3) is proved for
the damped semilinear stochastic wave equation defined on the entire space R^3.
The nonlinearity is allowed to have a cubic growth rate which is referred to as
the critical exponent. The uniform pullback estimates on the tails of solutions
fo... | 0810.1988v1 |
2008-10-16 | Liquid behavior of hot QGP in the finite temperature field theory | In this paper, we compare the dispersion relations of hard thermal loop and
complete one loop. It is shown that in the dynamical screening regime, the
completely one-loop calculation presents a prominent threshold frequency, below
which no pure imaginary mode survives. This phenomenon is responsible for the
oscillatory... | 0810.2841v1 |
2008-10-22 | Quantum Brownian motion under rapid periodic forcing | We study the steady state behaviour of a confined quantum Brownian particle
subjected to a space-dependent, rapidly oscillating time-periodic force. To
leading order in the period of driving, the result of the oscillating force is
an effective static potential which has a quantum dissipative contribution,
$V_{QD}$, whi... | 0810.4050v2 |
2008-10-25 | The domain wall spin torque-meter | We report the direct measurement of the non-adiabatic component of the
spin-torque in domain walls. Our method is independent of both the pinning of
the domain wall in the wire as well as of the Gilbert damping parameter. We
demonstrate that the ratio between the non-adiabatic and the adiabatic
components can be as hig... | 0810.4633v1 |
2008-10-26 | Static potentials for quarkonia at finite temperatures | We review non-perturbative static potentials commonly used in potential
models for quarkonia at finite T. Potentials derived from Polyakov loop
correlators are shown to be inappropriate for this purpose. The q\bar{q} free
energy is physical but has the wrong spatial decay and perturbative limit. The
so-called singlet f... | 0810.4685v1 |
2008-10-30 | Weakly Turbulent MHD Waves in Compressible Low-Beta Plasmas | In this Letter, weak turbulence theory is used to investigate interactions
among Alfven waves and fast and slow magnetosonic waves in collisionless
low-beta plasmas. The wave kinetic equations are derived from the equations of
magnetohydrodynamics, and extra terms are then added to model collisionless
damping. These eq... | 0810.5360v1 |
2008-11-04 | Amplitude-Phase Coupling in a Spin-Torque Nano-Oscillator | The spin-torque nano-oscillator in the presence of thermal fluctuation is
described by the normal form of the Hopf bifurcation with an additive white
noise. By the application of the reduction method, the amplitude-phase coupling
factor, which has a significant effect on the power spectrum of the spin-torque
nano-oscil... | 0811.0425v1 |
2008-11-07 | Stability of drift waves in a field reversed configuration | The drift waves in field-reversed configurations without a toroidal magnetic
field, therefore no shear, play an important role in plasma transport. The
short connection length of the poloidal field in these systems leads to
significant stabilization by influencing the wave particle resonance. The field
reversed configu... | 0811.1201v1 |
2008-11-11 | Reduction and possible elimination of coating thermal noise using a rigidly controlled cavity with a QND technique | Thermal noise of a mirror is one of the most important issues in high
precision measurements such as gravitational-wave detection or cold damping
experiments. It has been pointed out that thermal noise of a mirror with
multi-layer coatings can be reduced by mechanical separation of the layers. In
this paper, we introdu... | 0811.1780v1 |
2008-11-17 | PGPE theory of finite temperature collective modes for a trapped Bose gas | We develop formalism based on the projected Gross Pitaevskii equation to
simulate the finite temperature collective mode experiments of Jin et al. [PRL
78, 764 (1997)]. We examine the $m=0$ and $m=2$ quadrupolar modes on the
temperature range $0.51T_c-0.83T_c$ and calculate the frequencies of, and phase
between, the co... | 0811.2635v1 |
2008-11-19 | Excitation of spin waves on a cylindrical semiconductor heterostructure with Rashba spin-orbit interaction | Elementary excitations in a paramagnetic semiconductor quantum well confined
to a cylindrical surface are theoretically studied on the basis of coupled
spin-charge drift-diffusion equations. The electric-field-mediated eigenmodes
are optically excited by an oscillating interference pattern, which induces a
current in t... | 0811.3070v1 |
2008-11-28 | Effect of Nonlocal Spin-Transfer Torque on Current-Induced Magnetization Dynamics | Using the self-consistent model, we present nonlocal spin-transfer effects
caused by the feedback between inhomogeneous magnetization and spin-transfer
torque on the current-induced magnetization dynamics in nanomagnets. The
nonlocal effects can substantially improve the coherence time of precession in
nanomagnets and ... | 0811.4649v1 |
2008-11-29 | Plane Gravitational Radiation from Neutrinos Source with Kalb-Ramond Coupling | In this work, we propose a model based on a non-minimal coupling of neutrinos
to a Kalb-Ramond field. The latter is taken as a possible source for
gravitational radiation. As an immediate illustration of this system, we have
studied the case where gravitational (plane) wave solutions behave as damped
harmonic oscillato... | 0812.0078v1 |
2008-12-03 | Observation of ferromagnetic resonance in strontium ruthenate (SrRuO3) | We report the observation of ferromagnetic resonance (FMR) in SrRuO3 using
the time-resolved magneto-optical Kerr effect. The FMR oscillations in the
time-domain appear in response to a sudden, optically induced change in the
direction of easy-axis anistropy. The high FMR frequency, 250 GHz, and large
Gilbert damping p... | 0812.0832v1 |
2008-12-04 | On parton distributions in a photon gas | In some cases it may be useful to know parton distributions in a photon gas.
This may be relevant, e.g., for the analysis of interactions of high energy
cosmic ray particles with the cosmic microwave background radiation. The latter
can be considered as a gas of photons with an almost perfect blackbody
spectrum. An app... | 0812.0937v2 |
2008-12-09 | Parameter estimation with cluster states | We propose a scheme for parameter estimation with cluster states. We find
that phase estimation with cluster states under a many-body Hamiltonian and
separable measurements leads to a precision at the Heisenberg limit. As noise
models we study the dephasing, depolarizing, and pure damping channels.
Decoherence reduces ... | 0812.1747v3 |
2008-12-19 | Head-Tail Modes for Strong Space Charge | The head-tail modes are described for the space charge tune shift
significantly exceeding the synchrotron tune. A general equation for the modes
is derived. The spatial shapes of the modes, their frequencies, and coherent
growth rates are explored. The Landau damping rates are also found. The
suppression of the transve... | 0812.3914v3 |
2008-12-30 | Bulk viscosity of strange matter and r-modes in neutron stars | We discuss bulk viscosity due to non-leptonic processes involving hyperons
and Bose-Einstein condensate of negatively charged kaons in neutron stars. It
is noted that the hyperon bulk viscosity coefficient is a few order of
magnitude larger than that of the case with the condensate. Further it is found
that the hyperon... | 0812.5021v1 |
2009-01-06 | Ionization in damped time-harmonic fields | We study the asymptotic behavior of the wave function in a simple one
dimensional model of ionization by pulses, in which the time-dependent
potential is of the form $V(x,t)=-2\delta(x)(1-e^{-\lambda t} \cos\omega t)$,
where $\delta$ is the Dirac distribution. We find the ionization probability in
the limit $t\to\infty... | 0901.0724v1 |
2009-01-09 | Stability of the Second Order Delay Differential Equations with a Damping Term | For the delay differential equations $$ \ddot{x}(t)
+a(t)\dot{x}(g(t))+b(t)x(h(t))=0, g(t)\leq t, h(t)\leq t, $$ and $$ \ddot{x}(t)
+a(t)\dot{x}(t)+b(t)x(t)+a_1(t)\dot{x}(g(t))+b_1(t)x(h(t))=0 $$ explicit
exponential stability conditions are obtained. | 0901.1277v1 |
2009-01-20 | Multiple regimes of diffusion | We consider the diffusion of independent particles experiencing random
accelerations by a space- and time-dependent force as well as viscous damping.
This model can exhibit several asymptotic behaviours, depending upon the
limiting cases which are considered, some of which have been discussed in
earlier work. Here we e... | 0901.3077v1 |
2009-01-22 | Magnetic Field Induced Superconductivity in Out-of-Equilibrium Nanowires | Four-terminal resistance measurements have been carried out on Zn nanowires
formed using electron-beam lithography. When driven resistive by current, these
wires re-enter the superconducting state upon application of small magnetic
fields. The data are qualitatively different from those of previous experiments
on super... | 0901.3519v1 |
2009-01-23 | Wave propagation through soils in centrifuge testing | Wave propagation phenomena in soils can be experimentally simulated using
centrifuge scale models. An original excitation device (drop-ball arrangement)
is proposed to generate short wave trains. Wave reflections on model boundaries
are taken into account and removed by homomorphic filtering. Propagation is
investigate... | 0901.3718v1 |
2009-01-27 | Excitation of standing kink oscillations in coronal loops | In this work we review the efforts that have been done to study the
excitation of the standing fast kink body mode in coronal loops. We mainly
focus on the time-dependent problem, which is appropriate to describe flare or
CME induced kink oscillations. The analytical and numerical studies in slab and
cylindrical loop g... | 0901.4233v1 |
2009-02-09 | Seismic Crystals And Earthquake Shield Application | We theoretically demonstrate that earthquake shield made of seismic crystal
can damp down surface waves, which are the most destructive type for
constructions. In the paper, seismic crystal is introduced in aspect of band
gaps (Stop band) and some design concepts for earthquake and tsunami shielding
were discussed in t... | 0902.1429v4 |
2009-02-11 | Quantum fluctuation theorems in the strong damping limit | We consider a driven quantum particle in the strong friction regime described
by the quantum Smoluchowski equation. We derive Crooks and Jarzynski type
relations for the reduced quantum system by properly generalizing the entropy
production to take into account the non-Gibbsian character of the equilibrium
distribution... | 0902.1858v2 |
2009-02-13 | Continuous decoupling and freeze-out | The decoupling and freeze-out of energetic nuclear collisions is analysed in
terms of transparent semi-classical decoupling formulae. They provide a smooth
transition and generalise frequently employed instantaneous freeze-out
procedures. Simple relations between the damping width and the duration of the
decoupling pro... | 0902.2373v1 |
2009-02-22 | Noise and dissipation in magnetoelectronic nanostructures | We study the coupled current and magnetization noise in magnetic
nanostructures by magnetoelectronic circuit theory. Spin current fluctuations,
which depend on the magnetic configuration, are found to be an important source
of magnetization noise and damping in thinly layered systems. The enhanced
magnetization fluctua... | 0902.3779v1 |
2009-02-26 | Formation of Cooper pairs in quantum oscillations of electrons in plasma | We study low energy quantum oscillations of electron gas in plasma. It is
shown that two electrons participating in these oscillations acquire additional
negative energy when they interact by means of a virtual plasmon. The
additional energy leads to the formation a Cooper pair and possible existence
of the superconduc... | 0902.4596v1 |
2009-03-02 | Gravitational Wave Sources May Be "Further" Than We Think | It has been argued that the energy content in time varying spacetimes can be
obtained by using the approximate Lie symmetries of the geodesics equations in
that spacetime. When applied to cylindrical gravitational waves, it gives a
self-damping of the waves. According to this proposal the energy of the waves
go to zero... | 0903.0252v3 |
2009-03-07 | Impurity effects in multiferroic compounds | We investigate the effect of impurities in multiferroic materials using an
equation of motion approach for the spin dynamics of the host multiferroic
compound. We model the impurities as a two-level system and focus on the regime
where the impurity spins relax slowly. When the impurity strength is weak the
host spins o... | 0903.1319v1 |
2009-03-12 | Quantum Noise Interference and Back-action Cooling in Cavity Nanomechanics | We present a theoretical analysis of a novel cavity electromechanical system
where a mechanical resonator directly modulates the damping rate kappa of a
driven electromagnetic cavity. We show that via a destructive interference of
quantum noise, the driven cavity can effectively act like a zero-temperature
bath irrespe... | 0903.2242v2 |
2009-03-19 | Comment on "Non-monotonicity in the Quantum-Classical Transition: Chaos Induced by Quantum Effects" | In a recent Letter [PRL 101, 074101 (2008)], Kapulkin and Pattanayak
presented evidence that a quantum Duffing oscillator, sufficiently damped so
that it is not classically chaotic, becomes chaotic in the transition region
between quantum and classical motion. If true, this would be a striking result.
However, Kapulkin... | 0903.3417v1 |
2009-03-24 | The Jeans Mechanism and Bulk-Viscosity Effects | In this paper we study the gravitational instability in presence of
viscosity. In particular, the standard Jeans Mechanism is analyzed taking into
account bulk-viscosity effects in the first-order Newtonian dynamics. We show
how the perturbation evolution is damped by dissipative processes and the
top-down fragmentatio... | 0903.4122v3 |
2009-04-10 | Vortex oscillations induced by a spin-polarized current in a magnetic nanopillar: Evidence for a failure of the Thiele approach | We investigate the vortex excitations induced by a spin-polarized current in
a magnetic nanopillar by means of micromagnetic simulations and analytical
calculations. Damped motion, stationary vortex rotation and the switching of
the vortex core are successively observed for increasing values of the current.
We demonstr... | 0904.1751v1 |
2009-04-14 | Quasiparticle tunneling: P(E) theory | A calculation of the energy decay rate of a Josephson qubit from
non-equilibrium quasiparticles is made using the environmental P(E) theory. For
a large-capacitance qubit, we extend the theory to include the tunneling of
quasiparticles, which has an electron- and hole-like charge components. | 0904.2035v2 |
2009-04-16 | Experimental synchronization of circuit oscillations induced by common telegraph noise | Experimental realization and quantitative investigation of
common-noise-induced synchronization of limit-cycle oscillations subject to
random telegraph signals are performed using an electronic oscillator circuit.
Based on our previous formulation [K. Nagai et al., Phys. Rev. E 71, 036217
(2005)], dynamics of the circu... | 0904.2439v1 |
2009-04-17 | ITM Probe: analyzing information flow in protein networks | Summary: Founded upon diffusion with damping, ITM Probe is an application for
modeling information flow in protein interaction networks without prior
restriction to the sub-network of interest. Given a context consisting of
desired origins and destinations of information, ITM Probe returns the set of
most relevant prot... | 0904.2770v1 |
2009-04-28 | Dielectric function and plasmons in graphene | The electromagnetic response of graphene, expressed by the dielectric
function, and the spectrum of collective excitations are studied as a function
of wave vector and frequency. Our calculation is based on the full band
structure, calculated within the tight-binding approximation. As a result, we
find plasmons whose d... | 0904.4378v1 |
2009-05-01 | Asymptotic behavior of second-order dissipative evolution equations combining potential with non-potential effects | We study the asymptotic convergence properties, as the time variable goes to
infinity, of trajectories of second-order dissipative evolution equations
combining potential with non-potential effects. We exhibit a sharp condition,
involving the damping parameter and the cocoercive coefficient of the
non-potential operato... | 0905.0092v1 |
2009-05-04 | Homopolar oscillating-disc dynamo driven by parametric resonance | We use a simple model of Bullard-type disc dynamo, in which the disc rotation
rate is subject to harmonic oscillations, to analyze the generation of magnetic
field by the parametric resonance mechanism. The problem is governed by a
damped Mathieu equation. The Floquet exponents, which define the magnetic field
growth r... | 0905.0400v1 |
2009-05-06 | Quantum adaptation of noisy channels | Probabilistic quantum filtering is proposed to properly adapt sequential
independent quantum channels in order to stop sudden death of entanglement. In
the adaptation, the quantum filtering does not distill or purify more
entanglement, it rather properly prepares entangled state to the subsequent
quantum channel. For e... | 0905.0862v1 |
2009-05-13 | Observation of spin-wave propagation in permalloy microstripes | We report on the propagation of spin waves in permalloy microstripes. By
means of scanning Kerr microscopy combined with continuous microwave
excitation, we detect the time evolution of spin-wave interference patterns in
an external magnetic field. Assuming transverse spin-wave quantization we can
directly measure the ... | 0905.2172v1 |
2009-05-18 | Global well-posedness for cubic NLS with nonlinear damping | We study the Cauchy problem for the cubic nonlinear Schroedinger equation,
perturbed by (higher order) dissipative nonlinearities. We prove global in-time
existence of solutions for general initial data in the energy space. In
particular we treat the energy-critical case of a quintic dissipation in three
space dimensio... | 0905.3000v4 |
2009-05-20 | Pumping properties of the hybrid single-electron transistor in dissipative environment | Pumping characteristics were studied of the hybrid
normal-metal/superconductor single-electron transistor embedded in a high-ohmic
environment. Two 3 micrometer-long microstrip resistors of CrOx with a sum
resistance R=80kOhm were placed adjacent to this hybrid device. Substantial
improvement of pumping and reduction o... | 0905.3402v1 |
2009-05-27 | Stability of scalar radiative shock profiles | This work establishes nonlinear orbital asymptotic stability of scalar
radiative shock profiles, namely, traveling wave solutions to the simplified
model system of radiating gas \cite{Hm}, consisting of a scalar conservation
law coupled with an elliptic equation for the radiation flux. The method is
based on the deriva... | 0905.4448v1 |
2009-05-28 | Wigner function non-classicality as indicator of quantum chaos | We propose a Wigner function based parameter that can be used as an indicator
of quantum chaos. This parameter is defined as "entropy" from the
time-dependence of "non-classicallity" proposed in \cite{KZ04}. We perform our
considerations for the system of damped nonlinear (Kerr-like) oscillator
excited by a series of u... | 0905.4638v2 |
2009-05-30 | Solution of linearized Fokker - Planck equation for incompressible fluid | In this work we construct algebraic equation for elements of spectrum of
linearized Fokker - Planck differential operator for incompressible fluid. We
calculate roots of this equation using simple numeric method. For all these
roots real part is positive, that is corresponding solutions are damping.
Eigenfunctions of l... | 0906.0070v1 |
2009-06-09 | Homogenization of accelerated Frenkel-Kontorova models with $n$ types of particles | We consider systems of ODEs that describe the dynamics of particles. Each
particle satisfies a Newton law (including the acceleration term) where the
force is created by the interactions with the other particles and with a
periodic potential. The presence of a damping term allows the system to be
monotone. Our study ta... | 0906.1722v2 |
2009-06-12 | Poor qubits make for rich physics: noise-induced quantum Zeno effects and noise-induced Berry phases | We briefly review three ways that environmental noise can slow-down (or
speed-up) quantum transitions; (i) Lamb shifts, (ii) over-damping and (iii)
orthogonality catastrophe. We compare them with the quantum Zeno effect induced
by observing the system. These effects are relevant to poor qubits (those
strongly coupled t... | 0906.2368v1 |
2009-06-19 | Investigation of an alternate means of wakefield suppression in the main linacs of CLIC | We report on suppression of long-range wakefields in CLIC accelerating
structures. Strong detuning and moderate damping is employed. In these initial
design studies we focus on the CLIC_G structure and enforce a moderate Q of 300
and 500. We maintain a dipole bandwidth of approximately 1 GHz as specified
from breakdown... | 0906.3591v1 |
2009-06-22 | Thermal breakage of a discrete one-dimensional string | We study the thermal breakage of a discrete one-dimensional string, with open
and fixed ends, in the heavily damped regime. Basing our analysis on the
multidimensional Kramers escape theory, we are able to make analytical
predictions on the mean breakage rate, and on the breakage propensity with
respect to the breakage... | 0906.3754v3 |
2009-06-23 | Parameter Estimation in Diagonalizable Stochastic Hyperbolic Equations | A parameter estimation problem is considered for a linear stochastic
hyperbolic equation driven by additive space-time Gaussian white noise. The
damping/amplification operator is allowed to be unbounded.
The estimator is of spectral type and utilizes a finite number of the spatial
Fourier coefficients of the solution... | 0906.4353v1 |
2009-06-29 | Semiclassical Wigner distribution for two-mode entangled state generated by an optical parametric oscillator | We derive the steady state solution of the Fokker-Planck equation that
describes the dynamics of the nondegenerate optical parametric oscillator in
the truncated Wigner representation of the density operator. The adiabatic
limit of strong pump damping is assumed. This phase space image provides a
clear view of the intr... | 0906.5316v1 |
2009-07-02 | The Jeans Instability in Presence of Viscous Effects | An analysis of the gravitational instability in presence of dissipative
effects is addressed. In particular, the standard Jeans Mechanism and the
generalization in treating the Universe expansion are both analyzed when bulk
viscosity affects the first-order Newtonian dynamics. As results, the
perturbation evolution is ... | 0907.0434v2 |
2009-07-05 | Stabilities for Euler-Poisson Equations in Some Special Dimensions | We study the stabilities and classical solutions of Euler-Poisson equations
of describing the evolution of the gaseous star in astrophysics. In fact, we
extend the study the stabilities of Euler-Poisson equations with or without
frictional damping term to some special dimensional spaces. Besides, by using
the second in... | 0907.0873v1 |
2009-07-10 | Fractional Equations of Curie-von Schweidler and Gauss Laws | The dielectric susceptibility of most materials follows a fractional
power-law frequency dependence that is called the "universal" response. We
prove that in the time domain this dependence gives differential equations with
derivatives and integrals of noninteger order. We obtain equations that
describe "universal" Cur... | 0907.1837v1 |
2009-07-13 | Universal Electromagnetic Waves in Dielectric | The dielectric susceptibility of a wide class of dielectric materials
follows, over extended frequency ranges, a fractional power-law frequency
dependence that is called the "universal" response. The electromagnetic fields
in such dielectric media are described by fractional differential equations
with time derivatives... | 0907.2163v1 |
2009-07-21 | Wobbling kinks in $φ^4$ theory | We present a uniform asymptotic expansion of the wobbling kink to any order
in the amplitude of the wobbling mode. The long-range behaviour of the
radiation is described by matching the asymptotic expansions in the far field
and near the core of the kink. The complex amplitude of the wobbling mode is
shown to obey a si... | 0907.3611v1 |
2009-07-31 | New Correlated Model of Colossal Magnetoresistive Manganese Oxides | A new minimal model is constructed for the doped manganese oxides which
exhibit colossal magnetoresistance (CMR), involving broad spin-majority
conduction band as well as nearly localised spin-minority electron states. A
simple mean field analysis yields a temperature-dependent hybridised band
structure with suppressed... | 0907.5512v3 |
2009-08-11 | Effect of bath temperature on the quantum decoherence | The dynamics of a qubit in two different environments are investigated
theoretically. The first environment is a two level system coupled to a bosonic
bath. And the second one is a damped harmonic oscillator. Based on a unitary
transformation, we find that the decoherence of the qubit can be reduced with
increasing tem... | 0908.1454v2 |
2009-08-15 | Numerical study on diverging probability density function of flat-top solitons in an extended Korteweg-de Vries equation | We consider an extended Korteweg-de Vries (eKdV) equation, the usual
Korteweg-de Vries equation with inclusion of an additional cubic nonlinearity.
We investigate the statistical behaviour of flat-top solitary waves described
by an eKdV equation in the presence of weak dissipative disorder in the linear
growth/damping ... | 0908.2152v1 |
2009-09-01 | Polariton-mediated Raman scattering in microcavities: A Green's function approach | We present calculations of the intensity of polariton-mediated inelastic
light scattering in semiconductor microcavities within a Green's function
framework. In addition to reproducing the strong coupling of light and matter,
this method also enables the inclusion of damping mechanisms in a consistent
way. Our results ... | 0909.0296v1 |
2009-09-02 | Numerical modelling of convection-diffusion-reaction problems with free boundary in 1D | We discuss a numerical method for convection-diffusion-reaction problems with
a free boundary in 1D. The method is based on the numerical modelling of the
interface evolution, the transformation to a fixed domain problem and the
approximation by an ODE system. The interface evolution is modelled by means of
the local s... | 0909.0363v1 |
2009-09-02 | Quantum Zeno and anti-Zeno effect in atom-atom entanglement induced by non-Markovian environment | The dynamic behavior of the entanglement for two two-level atoms coupled to a
common lossy cavity is studied. We find that the speed of disentanglement is a
decreasing (increasing) function of the damping rate of the cavity for on/near
(far-off) resonant couplings. The quantitative explanations for these phenomena
are ... | 0909.0375v1 |
2009-10-07 | Cavity cooling of an optically trapped nanoparticle | We study the cooling of a dielectric nanoscale particle trapped in an optical
cavity. We derive the frictional force for motion in the cavity field, and show
that the cooling rate is proportional to the square of oscillation amplitude
and frequency. Both the radial and axial centre-of-mass motion of the trapped
particl... | 0910.1221v1 |
2009-10-19 | Valley symmetry breaking in bilayer graphene: a test to the minimal model | Physical properties reflecting valley asymmetry of Landau levels in a biased
bilayer graphene under magnetic field are discussed. Within the $4-$band
continuum model with Hartree-corrected self-consistent gap and finite damping
factor we predict the appearance of anomalous steps in quantized Hall
conductivity due to th... | 0910.3469v1 |
2009-10-27 | Quasinormal modes of Dirac field perturbation in Reissner-Nordström black hole surrounded by quintessence | The dirac quasinormal modes of the Reissner-Nordstr\"om black hole surrounded
by quintessence are investigated using the third WKB approximation. We find
that the magnitude of the imaginary part of the quasinormal mode frequencies
increases firstly and then decreases as the charge $Q$ increases, but it
decreases as the... | 0910.5128v2 |
2009-10-28 | DNA Breathing Dynamics in the Presence of a Terahertz Field | We consider the influence of a terahertz field on the breathing dynamics of
double-stranded DNA. We model the spontaneous formation of spatially localized
openings of a damped and driven DNA chain, and find that linear instabilities
lead to dynamic dimerization, while true local strand separations require a
threshold a... | 0910.5294v1 |
2009-10-28 | Interacting spin waves in the ferromagnetic Kondo lattice model | We present an new approach for the ferromagnetic, three-dimensional,
translational-symmetric Kondo lattice model which allows us to derive both
magnon energies and linewidths (lifetimes) and to study the properties of the
ferromagnetic phase at finite temperatures. Both "anomalous softening" and
"anomalous damping" are... | 0910.5478v2 |
2009-11-23 | Constraints on neutrino -- dark matter interactions from cosmic microwave background and large scale structure data | We update a previous investigation of cosmological effects of a non-standard
interaction between neutrinos and dark matter. Parameterizing the
elastic-scattering cross section between the two species as a function of the
temperature of the universe, the resulting neutrino-dark matter fluid has a
non-zero pressure, whic... | 0911.4411v1 |
2009-11-25 | Phase-Mixing and Dissipation of Standing Shear Alfven waves | We study the phase mixing and dissipation of a packet of standing shear
Alfv\'en waves localized in a region with non-uniform Alfv\'en background
velocity. We investigate the validity of the exponential damping law in time,
$\exp(-At^3)$, presented by Heyvaerts & Priest (1983) for different ranges of
Lundquist, $S$, an... | 0911.4901v1 |
2009-12-10 | On Schroedinger Equation with Time-Dependent Quadratic Hamiltonian in $R^d$ | We study solutions to the Cauchy problem for the linear and nonlinear
Schroedinger equation with a quadratic Hamiltonian depending on time. For the
linear case the evolution operator can be expressed as an integral operator
with the explicit formula for the kernel. As a consequence, conditions for
local and global in t... | 0912.2113v3 |
2009-12-18 | Polariton crystallization in driven arrays of lossy nonlinear resonators | We investigate the steady states of a lossy array of nonlinear optical
resonators that are driven by lasers and interact via mutual photon tunneling.
For weak nonlinearities, we find two-mode squeezing of polaritons in modes
whose quasi-momenta match the relative phases of the laser drives. For strong
nonlinearities th... | 0912.3612v2 |
2009-12-18 | Anomalous Light Absorption by Small Particles | A new type of resonant light absorption by a small particle (nanocluster) is
reported. The problem cannot be described within the commonly used dipole
scattering approximation and should be studied with methods based upon the
exact Mie solution. It is shown that the absorption cross-section has giant
maxima realized at... | 0912.3644v1 |
2009-12-20 | Unconventional state with two coexisting long-range orders for frustrated Heisenberg model at quantum phase transition | For the frustrated two-dimensional $S=1/2$ antiferromagnetic Heisenberg model
close to quantum phase transition we consider the singlet ground states
retaining both translational and SU(2) symmetry. Besides usually discussed
checkerboard, spin-liquid and stripe states an unconventional state with two
coexisting long-ra... | 0912.4008v1 |
2009-12-22 | Interference of magnetointersubband and phonon-induced resistance oscillations in single GaAs quantum wells with two populated subbands | Low-temperature electron magnetotransport in single GaAs quantum wells with
two populated subbands is studied at large filling factors.
Magneto-inter-subband (MIS) and acoustic-phonon induced oscillations of the
dissipative resistance are found to be coexisting but interfering substantially
with each other. The experim... | 0912.4366v1 |
2009-12-22 | Collective oscillations in ultracold atomic gases | Using both fluid and kinetic descriptions, where repulsive forces between
near by atoms are included, we discuss the basic oscillations and waves of a
cloud of ultra-cold atoms confined in a magneto-optical trap. The existence of
a hybrid mode, with properties similar to both plasma and acoustic waves is
described in d... | 0912.4420v1 |
2009-12-23 | Solar-type Variables | The rich acoustic oscillation spectrum in solar-type variables make these
stars particularly interesting for studying fluid-dynamical aspects of the
stellar interior. I present a summary of the properties of solar-like
oscillations, how they are excited and damped and discuss some of the recent
progress in using astero... | 0912.4622v2 |
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