publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2004-09-27 | Damping of electromagnetic waves due to electron-positron pair production | The problem of the backreaction during the process of electron-positron pair
production by a circularly polarized electromagnetic wave propagating in a
plasma is investigated. A model based on the relativistic Boltzmann-Vlasov
equation with a source term corresponding to the Schwinger formula for the pair
creation rate... | 0409301v1 |
2005-10-25 | Infrared behavior of the dispersion relations in high-temperature scalar QED | We investigate the infrared properties of the next-to-leading-order
dispersion relations in scalar quantum electrodynamics at high temperature in
the context of hard-thermal-loop perturbation theory. Specifically, we
determine the damping rate and the energy for scalars with ultrasoft momenta.
We show by explicit calcu... | 0510330v1 |
2006-11-09 | Lepton asymmetry in the primordial gravitational wave spectrum | Effects of neutrino free streaming is evaluated on the primordial spectrum of
gravitational radiation taking both neutrino chemical potential and masses into
account. The former or the lepton asymmetry induces two competitive effects,
namely, to increase anisotropic pressure, which damps the gravitational wave
more, an... | 0611121v1 |
2005-03-17 | A New Approach to Canonical Quantization of the Radiation Damping | Inspired in some works about quantization of dissipative systems, in
particular of the damped harmonic oscillator\cite{MB,RB,12}, we consider the
dissipative system of a charge interacting with its own radiation, which
originates the radiation damping (RD). Using the indirect Lagrangian
representation we obtained a Lag... | 0503135v1 |
2003-09-15 | Eigenfrequencies and expansions for damped wave equations | We study eigenfrequencies and propagator expansions for damped wave equations
on compact manifolds. Under the assumption of geometric control, the propagator
is shown to admit an expansion in terms of finitely many eigenmodes near the
real axis, with an error term exponentially decaying in time. In the presence
of a no... | 0309250v1 |
2004-06-02 | Instability results for the damped wave equation in unbounded domains | We extend some previous results for the damped wave equation in bounded
domains in Euclidean spaces to the unbounded case. In particular, we show that
if the damping term is of the form $\alpha a$ with bounded $a$ taking on
negative values on a set of positive measure, then there will always exist
unbounded solutions f... | 0406041v1 |
1997-07-20 | Effects of gluon damping rate on the viscosity coefficient of the quark-gluon plasma at finite chemical potential | By considering the Debye screening and damping rate of gluons, the viscosity
coefficient of the quark-gluon plasma was evaluated via real-time finite
temperature QCD in the relaxation time approximation at finite temperature and
chemical potential . The results show that both the damping rate and the
chemical potential... | 9707033v1 |
2002-12-11 | Rotational Damping and Compound Formation in Warm Rotating Nuclei | The rotational damping width \Gamma_{rot} and the compound damping width
\Gamma_{comp} are two fundamental quantities that characterize rapidly rotating
compound nuclei having finite thermal excitation energy. A two-component
structure in the strength function of consecutive E2 transitions reflects the
two widths, and ... | 0212050v1 |
2003-07-27 | Chaos and rotational damping in particle-rotor model | The onset of chaos and the mechanism of rotational damping are studied in an
exactly soluble particle-rotor model. It is shown that the degree of chaoticity
as inferred from the statistical measures is closely related to the onset of
rotational damping obtained using the model Hamiltonian. | 0307104v2 |
1997-07-10 | Supersymmetric partner chirping of Newtonian free damping | We connect the classical free damping cases by means of Rosner's construction
in supersymmetric quantum mechanics. Starting with the critical damping, one
can obtain in the underdamping case a chirping of instantaneous physical
frequency \omega ^{2}(t) \propto \omega_{u}^{2}sech^2(\omega_{u}t), whereas in
the overdampe... | 9707012v4 |
2000-04-10 | Ermakov-Lewis angles for one-parameter supersymmetric families of Newtonian free damping modes | We apply the Ermakov-Lewis procedure to the one-parameter damped modes
\tilde{y} recently introduced by Rosu and Reyes, which are related to the
common Newtonian free damping modes y by the general Riccati solution [H.C.
Rosu and M. Reyes, Phys. Rev. E 57, 4850 (1998), physics/9707019]. In
particular, we calculate and ... | 0004014v4 |
2002-10-29 | Model of Internal Friction Damping in Solids | A model for harmonic oscillator damping due to the internal friction of
solids has been developed, based on considerations of a long period pendulum.
The assumption of a complex elastic modulus to describe stress-strain
hysteresis in the support structure of the pendulum yields an expression for
the figure of merit Q t... | 0210121v1 |
2003-06-11 | Nonlinear Damping of the 'Linear' Pendulum | This study shows that typical pendulum dynamics is far from the simple
equation of motion presented in textbooks. A reasonably complete damping model
must use nonlinear terms in addition to the common linear viscous expression.
In some cases a nonlinear substitute for assumed linear damping may be more
appropriate. Eve... | 0306081v1 |
2004-08-19 | Beyond the Linear Damping Model for Mechanical Harmonic Oscillators | The steady state motion of a folded pendulum has been studied using
frequencies of drive that are mainly below the natural (resonance) frequency of
the instrument. Although the free-decay of this mechanical oscillator appears
textbook exponential, the steady state behavior of the instrument for
sub-resonance drive can ... | 0408091v1 |
1998-01-28 | Phenomenological damping in trapped atomic Bose-Einstein condensates | The method of phenomenological damping developed by Pitaevskii for
superfluidity near the $\lambda$ point is simulated numerically for the case of
a dilute, alkali, inhomogeneous Bose-condensed gas near absolute zero. We study
several features of this method in describing the damping of excitations in a
Bose-Einstein c... | 9801064v1 |
1998-04-06 | Optimal quantum codes for preventing collective amplitude damping | Collective decoherence is possible if the departure between quantum bits is
smaller than the effective wave length of the noise field. Collectivity in the
decoherence helps us to devise more efficient quantum codes. We present a class
of optimal quantum codes for preventing collective amplitude damping to a
reservoir a... | 9804014v1 |
2000-01-12 | Antibunching effect of the radiation field in a microcavity with a mirror undergoing heavily damping oscillation | The interaction between the radiation field in a microcavity with a mirror
undergoing damping oscillation is investigated. Under the heavily damping
cases, the mirror variables are adiabatically eliminated.
The the stationary conditions of the system are discussed. The small
fluctuation approximation around steady va... | 0001036v1 |
2002-02-15 | Decoherence of Quantum Damped Oscillators | Quantum dissipation is studied within two model oscillators, the
Caldirola-Kanai (CK) oscillator as an open system with one degree of freedom
and the Bateman-Feshbach-Tikochinsky (BFT) oscillator as a closed system with
two degrees of freedom. Though these oscillators describe the same classical
damped motion, the CK o... | 0202089v1 |
2002-12-05 | Time correlated quantum amplitude damping channel | We analyze the problem of sending classical information through qubit
channels where successive uses of the channel are correlated. This work extends
the analysis of C. Macchiavello and G. M. Palma to the case of a non-Pauli
channel - the amplitude damping channel. Using the channel description outlined
in S. Daffer, e... | 0212032v1 |
2003-09-29 | Damping rates of the atomic velocity in Sisyphus cooling | We present a theoretical and experimental study of the damping process of the
atomic velocity in Sisyphus cooling. The relaxation rates of the atomic kinetic
temperature are determined for a 3D lin$\perp$lin optical lattice. We find that
the damping rates of the atomic temperature depend linearly on the optical
pumping... | 0309209v1 |
2005-06-01 | Quantum damped oscillator I: dissipation and resonances | Quantization of a damped harmonic oscillator leads to so called Bateman's
dual system. The corresponding Bateman's Hamiltonian, being a self-adjoint
operator, displays the discrete family of complex eigenvalues. We show that
they correspond to the poles of energy eigenvectors and the corresponding
resolvent operator wh... | 0506007v1 |
2005-10-19 | The damped harmonic oscillator in deformation quantization | We propose a new approach to the quantization of the damped harmonic
oscillator in the framework of deformation quantization. The quantization is
performed in the Schr\"{o}dinger picture by a star-product induced by a
modified "Poisson bracket". We determine the eigenstates in the damped regime
and compute the transiti... | 0510150v1 |
2006-04-28 | The characteristic function of optical evolution | The master equation of quantum optical density operator is transformed to the
equation of characteristic function. The parametric amplification and amplitude
damping as well as the phase damping are considered. The solution for the most
general initial quantum state is obtained for parametric amplification and
amplitud... | 0604208v4 |
2007-01-13 | Wave-particle duality in the damped harmonic oscillator | Quantization of the damped harmonic oscillator is taken as leitmotiv to
gently introduce elements of quantum probability theory for physicists. To this
end, we take (graduate) students in physics as entry level and explain the
physical intuition and motivation behind the, sometimes overwhelming, math
machinery of quant... | 0701082v1 |
2007-04-11 | Time dependence of joint entropy of oscillating quantum systems | The time dependent entropy (or Leipnik's entropy) of harmonic and damped
harmonic oscillators is extensively investigated by using time dependent wave
function obtained by the Feynman path integral method. Our results for simple
harmonic oscillator are in agrement with the literature. However, the joint
entropy of damp... | 0704.1370v3 |
2007-06-30 | The squeezed generalized amplitude damping channel | Squeezing of a thermal bath introduces new features absent in an open quantum
system interacting with an uncorrelated (zero squeezing) thermal bath. The
resulting dynamics, governed by a Lindblad-type evolution, extends the concept
of a generalized amplitude damping channel, which corresponds to a dissipative
interacti... | 0707.0059v2 |
2007-07-09 | Memory in a nonlocally damped oscillator | We analyze the new equation of motion for the damped oscillator. It differs
from the standard one by a damping term which is nonlocal in time and hence it
gives rise to a system with memory. Both classical and quantum analysis is
performed. The characteristic feature of this nonlocal system is that it breaks
local comp... | 0707.1199v2 |
2007-07-20 | Dynamics of Bloch Oscillations in Disordered Lattice Potentials | We present a detailed analysis of the dynamics of Bloch oscillations of
Bose-Einstein condensates in disordered lattice potentials. Due to the disorder
and the interparticle interactions these oscillations undergo a dephasing,
reflected in a damping of the center of mass oscillations, which should be
observable under r... | 0707.3131v1 |
2007-09-14 | Damping of field-induced chemical potential oscillations in ideal two-band compensated metals | The field and temperature dependence of the de Haas-van Alphen oscillations
spectrum is studied for an ideal two-dimensional compensated metal. It is shown
that the chemical potential oscillations, involved in the frequency
combinations observed in the case of uncompensated orbits, are strongly damped
and can even be s... | 0709.2223v2 |
2007-09-14 | Update on Ion Studies | The effect of ions has received one of the highest priorities in R&D for the
damping rings of the International Linear Collider(ILC). It is detrimental to
the performance of the electron damping ring. In this note, an update
concerning the ion studies for the ILC damping ring is given. We investigate
the gap role and i... | 0709.2248v1 |
2007-10-03 | Stability of a Nonlinear Axially Moving String With the Kelvin-Voigt Damping | In this paper, a nonlinear axially moving string with the Kelvin-Voigt
damping is considered. It is proved that the string is stable, i.e., its
transversal displacement converges to zero when the axial speed of the string
is less than a certain critical value. The proof is established by showing that
a Lyapunov functio... | 0710.0872v1 |
2007-10-15 | General Solution of the Quantum Damped Harmonic Oscillator | In this paper the general solution of the quantum damped harmonic oscillator
is given. | 0710.2724v4 |
2008-02-21 | Identification of Test Structures for Reduced Order Modeling of the Squeeze Film Damping in Mems | In this study the dynamic behaviour of perforated microplates oscillating
under the effect of squeeze film damping is analyzed. A numerical approach is
adopted to predict the effects of damping and stiffness transferred from the
surrounding ambient air to oscillating structures ; the effect of hole's cross
section and ... | 0802.3076v1 |
2008-03-14 | Current-induced noise and damping in non-uniform ferromagnets | In the presence of spatial variation of the magnetization direction, electric
current noise causes a fluctuating spin-transfer torque that increases the
fluctuations of the ferromagnetic order parameter. By the
fluctuation-dissipation theorem, the equilibrium fluctuations are related to
the magnetization damping, which... | 0803.2175v1 |
2008-04-23 | Ion acoustic waves in the plasma with the power-law q-distribution in nonextensive statistics | We investigate the dispersion relation and Landau damping of ion acoustic
waves in the collisionless magnetic-field-free plasma if it is described by the
nonextensive q-distributions of Tsallis statistics. We show that the increased
numbers of superthermal particles and low velocity particles can explain the
strengthen... | 0804.3732v1 |
2008-07-23 | Tunneling-induced damping of phase coherence revivals in deep optical lattices | We consider phase coherence collapse and revival in deep optical lattices,
and calculate within the Bose-Hubbard model the revival amplitude damping
incurred by a finite tunneling coupling of the lattice wells (after sweeping
from the superfluid to the Mott phase). Deriving scaling laws for the
corresponding decay of f... | 0807.3627v2 |
2008-07-31 | Generalized Theory of Landau Damping | Collisionless damping of electrical waves in plasma is investigated in the
frame of the classical formulation of the problem. The new principle of
regularization of the singular integral is used. The exact solution of the
corresponding dispersion equation is obtained. The results of calculations lead
to existence of di... | 0807.5007v1 |
2008-07-31 | Scattering Theory of Gilbert Damping | The magnetization dynamics of a single domain ferromagnet in contact with a
thermal bath is studied by scattering theory. We recover the
Landau-Liftshitz-Gilbert equation and express the effective fields and Gilbert
damping tensor in terms of the scattering matrix. Dissipation of magnetic
energy equals energy current p... | 0807.5009v1 |
2008-08-05 | Radiation damping, noncommutativity and duality | In this work, our main objective is to construct a N=2 supersymmetric
extension of the nonrelativistic $(2+1)$-dimensional model describing the
radiation damping on the noncommutative plane with scalar (electric) and vector
(magnetic) interactions by the N=2 superfield technique. We also introduce a
dual equivalent act... | 0808.0694v2 |
2008-08-28 | Gilbert Damping in Conducting Ferromagnets II: Model Tests of the Torque-Correlation Formula | We report on a study of Gilbert damping due to particle-hole pair excitations
in conducting ferromagnets. We focus on a toy two-band model and on a four-band
spherical model which provides an approximate description of ferromagnetic
(Ga,Mn)As. These models are sufficiently simple that disorder-ladder-sum vertex
correct... | 0808.3923v1 |
2008-10-06 | Local existence and exponential growth for a semilinear damped wave equation with dynamic boundary conditions | In this paper we consider a multi-dimensional damped semiliear wave equation
with dynamic boundary conditions, related to the Kelvin-Voigt damping. We
firstly prove the local existence by using the Faedo-Galerkin approximations
combined with a contraction mapping theorem. Secondly, the exponential growth
of the energy ... | 0810.1013v1 |
2008-11-20 | An explanation for the pseudogap of high-temperature superconductors based on quantum optics | We first explain the pseudogap of high-temperature superconductivity based on
an approach of quantum optics. After introducing a damping factor for the
lifetime $\tau$ of quasiparticles, the superconducting dome is naturally
produced, and the pseudogap is the consequence of pairing with damped
coherence. We derive a ne... | 0811.3262v1 |
2008-12-18 | Exponential decay for solutions to semilinear damped wave equation | This paper is concerned with decay estimate of solutions to the semilinear
wave equation with strong damping in a bounded domain. Introducing an
appropriate Lyaponuv function, we prove that when the damping is linear, we can
find initial data, for which the solution decays exponentially. This result
improves an early o... | 0812.3637v3 |
2009-05-27 | Difference between penetration and damping lengths in photonic crystal mirrors | Different mirror geometries in two-dimensional photonic crystal slabs are
studied with fully-vectorial calculations. We compare their optical properties
and, in particular, we show that, for heterostructure mirrors, the penetration
length associated with the delay induced by distributed reflection is not
correlated to ... | 0905.4449v2 |
2009-06-01 | Exponential Decay Rates for the Damped Korteweg-de Vries Type Equation | The exponential decay rate of $L^2-$norm related to the Korteweg-de Vries
equation with localized damping posed on whole real line will be established.
In addition, by using classical arguments we determine the $H^1-$norm of the
solution associated to Korteweg-de Vries equation with damping in whole domain,
can not hav... | 0906.0285v2 |
2009-07-02 | Damping and decoherence of a nanomechanical resonator due to a few two level systems | We consider a quantum model of a nanomechanical flexing beam resonator
interacting with a bath comprising a few damped tunneling two level systems
(TLS's). In contrast with a resonator interacting bilinearly with an ohmic free
oscillator bath (modeling clamping loss, for example), the mechanical resonator
damping is am... | 0907.0431v1 |
2009-07-29 | High performance single-error-correcting quantum codes for amplitude damping | We construct families of high performance quantum amplitude damping codes.
All of our codes are nonadditive and most modestly outperform the best possible
additive codes in terms of encoded dimension. One family is built from
nonlinear error-correcting codes for classical asymmetric channels, with which
we systematical... | 0907.5149v1 |
2009-10-12 | Suppression of Landau damping via electron band gap | The pondermotive potential in the X-ray Raman compression can generate an
electron band gap which suppresses the Landau damping. The regime is identified
where a Langmuir wave can be driven without damping in the stimulated Raman
compression. It is shown that the partial wave breaking and the frequency
detuning due to ... | 0910.2196v3 |
2009-10-27 | Rabi type oscillations in damped single 2D-quantum dot | We present a quantized model of harmonically confined dot atom with inherent
damping in the presence of a transverse magnetic field. The model leads to a
non hermitian Hamiltonian in real coordinate. We have analytically studied the
effects that damping has on the Rabi type oscillations of the system. The model
explain... | 0910.5184v1 |
2010-01-26 | Effect of spin-conserving scattering on Gilbert damping in ferromagnetic semiconductors | The Gilbert damping in ferromagnetic semiconductors is theoretically
investigated based on the $s$-$d$ model. In contrast to the situation in
metals, all the spin-conserving scattering in ferromagnetic semiconductors
supplies an additional spin relaxation channel due to the momentum dependent
effective magnetic field o... | 1001.4576v1 |
2010-03-08 | A single-ion nonlinear mechanical oscillator | We study the steady state motion of a single trapped ion oscillator driven to
the nonlinear regime. Damping is achieved via Doppler laser-cooling. The ion
motion is found to be well described by the Duffing oscillator model with an
additional nonlinear damping term. We demonstrate a unique ability of tuning
both the li... | 1003.1577v1 |
2010-03-24 | Global attractors for strongly damped wave equations with displacement dependent damping and nonlinear source term of critical exponent | In this paper the long time behaviour of the solutions of 3-D strongly damped
wave equation is studied. It is shown that the semigroup generated by this
equation possesses a global attractor in H_{0}^{1}(\Omega)\times L_{2}(\Omega)
and then it is proved that this global attractor is a bounded subset of
H^{2}(\Omega)\ti... | 1003.4760v3 |
2010-04-12 | Entanglement properties of optical coherent states under amplitude damping | Through concurrence, we characterize the entanglement properties of optical
coherent-state qubits subject to an amplitude damping channel. We investigate
the distillation capabilities of known error correcting codes and obtain upper
bounds on the entanglement depending on the non-orthogonality of the coherent
states an... | 1004.1931v2 |
2010-05-20 | Nonclassical phase-space trajectories for the damped harmonic quantum oscillator | The phase-space path-integral approach to the damped harmonic oscillator is
analyzed beyond the Markovian approximation. It is found that pairs of
nonclassical trajectories contribute to the path-integral representation of the
Wigner propagating function. Due to the linearity of the problem, the sum
coordinate of a pai... | 1005.3839v1 |
2010-06-09 | Self frequency-locking of a chain of oscillators | The paper studies the vibrational modes of a slightly damped uniform chain,
with n masses coupled by elastic forces. It will be shown that, for certain
lengths of the chain, that is for certain values of n, the damping of one of
the masses at a specific position in the chain is able to constrain the
vibration of the sy... | 1006.1722v1 |
2010-08-20 | First principles quasiparticle damping rates in bulk lead | First principles calculations of the damping rates (inverse inelastic
lifetimes) of low energy quasiparticles in bulk Pb are presented. Damping rates
are obtained both for excited electrons and holes with energies up to 8 eV on a
set of k vectors throughout the Brillouin zone (BZ). Strong localization
effects in the ca... | 1008.3415v1 |
2010-12-07 | Turbulence damping as a measure of the flow dimensionality | The dimensionality of turbulence in fluid layers determines their properties.
We study electromagnetically driven flows in finite depth fluid layers and show
that eddy viscosity, which appears as a result of three-dimensional motions,
leads to increased bottom damping. The anomaly coefficient, which characterizes
the d... | 1012.1371v1 |
2011-03-18 | Single File Diffusion of particles with long ranged interactions: damping and finite size effects | We study the Single File Diffusion (SFD) of a cyclic chain of particles that
cannot cross each other, in a thermal bath, with long ranged interactions, and
arbitrary damping. We present simulations that exhibit new behaviors
specifically associated to systems of small number of particles and to small
damping. In order ... | 1103.3642v1 |
2011-04-21 | Spin Damping Monopole | We present theoretical evidence that a magnetic monopole emerges in dynamic
magnetic systems in the presence of the spin-orbit interaction. The monopole
field is expressed in terms of spin damping associated with magnetization
dynamics. We demonstrate that the observation of this spin damping monopole is
accomplished e... | 1104.4215v2 |
2011-08-16 | Long time dynamics for forced and weakly damped KdV on the torus | The forced and weakly damped Korteweg-de Vries (KdV) equation with periodic
boundary conditions is considered. Starting from $L^2$ and mean-zero initial
data we prove that the solution decomposes into two parts; a linear one which
decays to zero as time goes to infinity and a nonlinear one which always
belongs to a smo... | 1108.3358v1 |
2011-10-17 | Normal Mode Expansion of Damped Coupled Oscillators in 3 dimensions | In this paper, I aim to study free oscillations of a system of oscillators in
more than one dimensions in the absence of damping. The basic approach lies in
decoupling the motion in the individual perpendicular directions. Once the
equations are decoupled, the existent techniques of Normal mode expansion for
1-dimensio... | 1110.3773v1 |
2011-10-25 | Distinguishing mesoscopic quantum superpositions from statistical mixtures in periodically shaken double wells | For Bose-Einstein condensates in double wells, N-particle Rabi-like
oscillations often seem to be damped. Far from being a decoherence effect, the
apparent damping can indicate the emergence of quantum superpositions in the
many-particle quantum dynamics. However, in an experiment it would be difficult
to distinguish t... | 1110.5444v1 |
2011-11-04 | Tunable magnetization relaxation in spin valves | In spin values the damping parameters of the free layer are determined
non-locally by the entire magnetic configuration. In a dual spin valve
structure that comprises a free layer embedded between two pinned layers, the
spin pumping mechanism, in combination with the angular momentum conservation,
renders the tensor-li... | 1111.1219v1 |
2011-11-23 | Wave Propagation And Landau-Type Damping In Liquids | Intermolecular forces are modeled by means of a modified Lennard-Jones
potential, introducing a distance of minimum approach, and the effect of
intermolecular interactions is accounted for with a self consistent field of
the Vlasov type. A Vlasov equation is then written and used to investigate the
propagation of pertu... | 1111.5519v3 |
2011-11-25 | Radiation Damping for Speeding-up NMR Applications | We demonstrate theoretically and numerically how to control the NMR
relaxation rate after application of the standard spin echo technique. Using
radiation damping, we return the nuclear magnetization to its equilibrium state
during a time interval that is negligible compared to the relaxation time. We
obtain an estimat... | 1111.7060v1 |
2011-12-09 | Perturbed damped pendulum: finding periodic solutions | Using the damped pendulum system we introduce the averaging method to study
the periodic solutions of a dynamical system with small perturbation. We
provide sufficient conditions for the existence of periodic solutions with
small amplitude of the non--linear perturbed damped pendulum. The averaging
theory provides a us... | 1112.2129v2 |
2011-12-28 | The role of damping for the driven anharmonic quantum oscillator | For the model of a linearly driven quantum anharmonic oscillator, the role of
damping is investigated. We compare the position of the stable points in phase
space obtained from a classical analysis to the result of a quantum mechanical
analysis. The solution of the full master equation shows that the stable points
beha... | 1112.6119v1 |
2012-01-03 | Creating and studying ion acoustic waves in ultracold neutral plasmas | We excite ion acoustic waves in ultracold neutral plasmas by imprinting
density modulations during plasma creation. Laser-induced fluorescence is used
to observe the density and velocity perturbations created by the waves. The
effect of expansion of the plasma on the evolution of the wave amplitude is
described by trea... | 1201.0786v1 |
2012-01-05 | Damped bead on a rotating circular hoop - a bifurcation zoo | The evergreen problem of a bead on a rotating hoop shows a multitude of
bifurcations when the bead moves with friction. This motion is studied for
different values of the damping coefficient and rotational speeds of the hoop.
Phase portraits and trajectories corresponding to all different modes of motion
of the bead ar... | 1201.1218v1 |
2012-02-24 | Small data global existence for the semilinear wave equation with space-time dependent damping | In this paper we consider the critical exponent problem for the semilinear
wave equation with space-time dependent damping. When the damping is effective,
it is expected that the critical exponent agrees with that of only space
dependent coefficient case. We shall prove that there exists a unique global
solution for sm... | 1202.5379v1 |
2012-03-11 | Magnetic damping of a carbon nanotube NEMS resonator | A suspended, doubly clamped single wall carbon nanotube is characterized at
cryogenic temperatures. We observe specific switching effects in dc-current
spectroscopy of the embedded quantum dot. These have been identified previously
as nano-electromechanical self-excitation of the system, where positive
feedback from si... | 1203.2319v2 |
2012-04-02 | Random Symmetry Breaking and Freezing in Chaotic Networks | Parameter space of a driven damped oscillator in a double well potential
presents either a chaotic trajectory with sign oscillating amplitude or a
non-chaotic trajectory with a fixed sign amplitude. A network of such delay
coupled damped oscillators is shown to present chaotic dynamics while the
amplitude sign of each ... | 1204.0528v1 |
2012-04-04 | Nonlinear Damping in Graphene Resonators | Based on a continuum mechanical model for single-layer graphene we propose
and analyze a microscopic mechanism for dissipation in nanoelectromechanical
graphene resonators. We find that coupling between flexural modes and in-plane
phonons leads to linear and nonlinear damping of out-of-plane vibrations. By
tuning exter... | 1204.0911v2 |
2012-05-22 | Heavy quark damping rate in hot viscous QCD plasma | We derive an expression for the heavy quark damping rate in hot quark gluon
plasma in presence of flow. Here all the bath particles here are out of
equilibrium due to the existence of non-zero velocity gradient. The magnetic
sector shows similar infrared divergences even after hard thermal loop
corrections as one encou... | 1205.4895v3 |
2012-05-25 | Spin wave amplification driven by heat flow: the role of damping and exchange interaction | In this article we report on micromagnetic simulations performed on a
permalloy nanostructure in presence of a uniform thermal gradient. Our
numerical simulations show that heat flow is an effective mean to compensate
the damping, and that the gradients at which spin-wave amplification is
observed are experimentally ac... | 1205.5650v2 |
2012-07-24 | Quantum capacity of an amplitude-damping channel with memory | We calculate the quantum capacity of an amplitude-damping channel with time
correlated Markov noise, for two channel uses. Our results show that memory of
the channel increases it's ability to transmit quantum information
significantly. We analyze and compare our findings with earlier numerical
results on amplitude-dam... | 1207.5612v3 |
2012-08-21 | Protecting quantum entanglement from amplitude damping | Quantum entanglement is a critical resource for quantum information and
quantum computation. However, entanglement of a quantum system is subjected to
change due to the interaction with the environment. One typical result of the
interaction is the amplitude damping that usually results in the reduction of
the entanglem... | 1208.4187v2 |
2012-10-03 | Exact solutions for discrete breathers in forced-damped chain | Exact solutions for symmetric discrete breathers (DBs) are obtained in
forced-damped linear chain with on-site vibro-impact constraints. The damping
is related to inelastic impacts; the forcing may be chosen from broad class of
periodic antisymmetric functions. Global conditions for existence and stability
of the DB ar... | 1210.1085v1 |
2012-12-20 | How long-range interactions tune the damping in compact stars | Long-range interactions lead to non-Fermi liquid effects in dense matter. We
show that, in contrast to other material properties, their effect on the bulk
viscosity of quark matter is significant since they shift its resonant maximum
and can thereby change the viscosity by many orders of magnitude. This is of
importanc... | 1212.5242v1 |
2013-02-12 | Impact of gluon damping on heavy-quark quenching | In this conference contribution, we discuss the influence of
gluon-bremsstrahlung damping in hot, absorptive QCD matter on the heavy-quark
radiation spectra. Within our Monte-Carlo implementation for the description of
the heavy-quark in-medium propagation we demonstrate that as a consequence of
gluon damping the quenc... | 1302.2934v1 |
2013-03-12 | On nonlinear Schrodinger type equations with nonlinear damping | We consider equations of nonlinear Schrodinger type augmented by nonlinear
damping terms. We show that nonlinear damping prevents finite time blow-up in
several situations, which we describe. We also prove that the presence of a
quadratic confinement in all spatial directions drives the solution of our
model to zero fo... | 1303.3033v2 |
2013-06-15 | A formula for damping interarea oscillations with generator redispatch | We derive a new formula for the sensitivity of electromechanical oscillation
damping with respect to generator redispatch. The formula could lead to some
combination of observations, computations and heuristics to more effectively
damp interarea oscillations. | 1306.3590v2 |
2013-07-24 | Eigenvalue asymptotics for the damped wave equation on metric graphs | We consider the linear damped wave equation on finite metric graphs and
analyse its spectral properties with an emphasis on the asymptotic behaviour of
eigenvalues. In the case of equilateral graphs and standard coupling conditions
we show that there is only a finite number of high-frequency abscissas, whose
location i... | 1307.6377v3 |
2013-08-03 | Hadamard well-posedness for a hyperbolic equation of viscoelasticity with supercritical sources and damping | Presented here is a study of a viscoelastic wave equation with supercritical
source and damping terms. We employ the theory of monotone operators and
nonlinear semigroups, combined with energy methods to establish the existence
of a unique local weak solution. In addition, it is shown that the solution
depends continuo... | 1308.0720v2 |
2013-10-14 | Signatures of two-level defects in the temperature-dependent damping of nanomechanical silicon nitride resonators | The damping rates of high quality factor nanomechanical resonators are well
beyond intrinsic limits. Here, we explore the underlying microscopic loss
mechanisms by investigating the temperature-dependent damping of the
fundamental and third harmonic transverse flexural mode of a doubly clamped
silicon nitride string. I... | 1310.3671v1 |
2013-10-25 | Quenched decoherence in qubit dynamics due to strong amplitude-damping noise | We study non-perturbatively the time evolution of a qubit subject to
amplitude-damping noise. We show that at strong coupling the qubit decoherence
can be quenched owing to large environment feedbacks, such that the qubit can
evolve coherently even in the long-time limit. As an application, we show that
for a quantum c... | 1310.6843v2 |
2013-11-16 | Shear viscosity due to the Landau damping from quark-pion interaction | We have calculated the shear viscosity coefficient $\eta$ of the strongly
interacting matter in the relaxation time approximation, where a quasi particle
description of quarks with its dynamical mass is considered from NJL model. Due
to the thermodynamic scattering of quarks with pseudo scalar type condensate
(i.e. pio... | 1311.4070v1 |
2013-12-19 | Cyclotron dynamics of interacting bosons in artificial magnetic fields | We study theoretically quantum dynamics of interacting bosons in artificial
magnetic fields as engineered in recent ultracold atomic experiments, where
quantum cyclotron orbital motion has been observed. With exact numerical
simulations and perturbative analyses, we find that interactions induce damping
in the cyclotro... | 1312.5747v2 |
2014-01-11 | Damping in two component Bose gas | We investigate the Landau and Baliaev damping of the collective modes in a
two-component Bose gas using the mean-field approximation. We show that due to
the two body atom-atom interaction, oscillations of each component is coupled
to the thermal excitations of the other component which gives rise to creation
or destru... | 1401.2537v1 |
2014-03-24 | Existence Results for Some Damped Second-Order Volterra Integro-Differential Equations | In this paper we make a subtle use of operator theory techniques and the
well-known Schauder fixed-point principle to establish the existence of
pseudo-almost automorphic solutions to some second-order damped
integro-differential equations with pseudo-almost automorphic coefficients. In
order to illustrate our main res... | 1403.5955v1 |
2014-04-25 | The time singular limit for a fourth-order damped wave equation for MEMS | We consider a free boundary problem modeling electrostatic
microelectromechanical systems. The model consists of a fourth-order damped
wave equation for the elastic plate displacement which is coupled to an
elliptic equation for the electrostatic potential. We first review some recent
results on existence and non-exist... | 1404.6342v1 |
2014-05-12 | A note on a strongly damped wave equation with fast growing nonlinearities | A strongly damped wave equation including the displacement depending
nonlinear damping term and nonlinear interaction function is considered. The
main aim of the note is to show that under the standard dissipativity
restrictions on the nonlinearities involved the initial boundary value problem
for the considered equati... | 1405.2707v1 |
2014-06-03 | Optimal Estimation of a Classical Force with a Damped Oscillator in the non-Markovian Bath | We solve the optimal quantum limit of probing a classical force exactly by a
damped oscillator initially prepared in the factorized squeezed state. The
memory effects of the thermal bath on the oscillator evolution are
investigated. We show that the optimal force sensitivity obtained by the
quantum estimation theory ap... | 1406.0658v1 |
2014-08-09 | Local existence results for the Westervelt equation with nonlinear damping and Neumann as well as absorbing boundary conditions | We investigate the Westervelt equation with several versions of nonlinear
damping and lower order damping terms and Neumann as well as absorbing boundary
conditions. We prove local in time existence of weak solutions under the
assumption that the initial and boundary data are sufficiently small.
Additionally, we prove ... | 1408.2160v1 |
2014-08-11 | Characterization and suppression techniques for degree of radiation damping in inversion recovery measurements | Radiation damping (RD) has been shown to affect T1 measurement in inversion
recovery experiments. In this work, we demonstrate that the extent of RD
depends upon the T1 of the sample. RD difference spectroscopy (RADDSY) is used
to characterize the severity of RD, while gradient inversion recovery (GIR) is
used for RD s... | 1408.2457v2 |
2014-09-28 | Spin-electron acoustic waves: The Landau damping and ion contribution in the spectrum | Separated spin-up and spin-down quantum kinetics is derived for more detailed
research of the spin-electron acoustic waves. Kinetic theory allows to obtain
spectrum of the spin-electron acoustic waves including effects of occupation of
quantum states more accurately than quantum hydrodynamics. We apply quantum
kinetic ... | 1409.7885v1 |
2014-10-15 | Quasiparticle Damping of Surface Waves in Superfluid $^3$He and $^4$He | Oscillations on free surface of superfluids at the inviscid limit are damped
by quasiparticle scattering. We have studied this effect in both superfluids
$^3$He and $^4$He deep below the respective critical temperatures. Surface
oscillators offer several benefits over immersed mechanical oscillators
traditionally used ... | 1410.4071v1 |
2014-12-22 | Long time behavior for a semilinear hyperbolic equation with asymtotically vanishing damping term and convex potential | We investigate the asymptotic behavior, as t goes to infinity, for a
semilinear hyperbolic equation with asymptotically smal dissipation and convex
potential. We prove that if the damping term behaves like K/t^\alpha for t
large enough, k>0 and 0</alpha<1 then every global solution converges weakly to
an equilibrium po... | 1412.7008v1 |
2015-02-06 | Microscopic theory of Gilbert damping in metallic ferromagnets | We present a microscopic theory for magnetization relaxation in metallic
ferromagnets of nanoscopic dimensions that is based on the dynamic spin
response matrix in the presence of spin-orbit coupling. Our approach allows the
calculation of the spin excitation damping rate even for perfectly crystalline
systems, where e... | 1502.02068v1 |
2015-03-03 | Large Deviations for the Langevin equation with strong damping | We study large deviations in the Langevin dynamics, with damping of order
$\e^{-1}$ and noise of order $1$, as $\e\downarrow 0$. The damping coefficient
is assumed to be state dependent. We proceed first with a change of time and
then, we use a weak convergence approach to large deviations and their
equivalent formulat... | 1503.01027v1 |
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