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2023-11-24 | Black hole spectroscopy beyond Kerr: agnostic and theory-based tests with next-generation interferometers | Black hole spectroscopy is a clean and powerful tool to test gravity in the
strong-field regime and to probe the nature of compact objects. Next-generation
ground-based detectors, such as the Einstein Telescope and Cosmic Explorer,
will observe thousands of binary black hole mergers with large signal-to-noise
ratios, a... | 2311.14803v3 |
2024-03-16 | Elasto-visco-plastic flows in benchmark geometries: I. 4 to 1 Planar Contraction | We present predictions for the flow of elastoviscoplastic (EVP) fluids in the
4 to 1 planar contraction geometry. The Saramito-Herschel-Bulkley fluid model
is solved via the finite-volume method with the OpenFOAM software. Both the
constitutive model and the solution method require using transient simulations.
In this ... | 2403.10890v1 |
1994-05-02 | Damped Lyman Alpha Systems vs. Cold + Hot Dark Matter | Although the Cold + Hot Dark Matter (CHDM) cosmology provides perhaps the
best fit of any model to all the available data at the current epoch, CHDM
produces structure at relatively low redshifts and thus could be ruled out if
there were evidence for formation of massive objects at high redshifts. Damped
Ly$\alpha$ sys... | 9405003v1 |
1995-03-24 | High Redshift Lyman Limit and Damped Lyman-Alpha Absorbers | We have obtained high signal:to:noise optical spectroscopy at 5\AA\
resolution of 27 quasars from the APM z$>$4 quasar survey. The spectra have
been analyzed to create new samples of high redshift Lyman-limit and damped
Lyman-$\alpha$ absorbers. These data have been combined with published data
sets in a study of the r... | 9503089v1 |
1997-05-15 | Cosmological Constraints from High-Redshift Damped Lyman-Alpha Systems | Any viable cosmological model must produce enough structure at early epochs
to explain the amount of gas associated with high-redshift damped Ly$\alpha$
systems. We study the evolution of damped Ly$\alpha$ systems at redshifts $z\ge
2$ in cold dark matter (CDM) and cold+hot dark matter (CDM+HDM) models using
both N-bod... | 9705113v1 |
2001-01-03 | Galactic Chemical Abundances at z>3 I: First Results from the Echellette Spectrograph and Imager | We present the first results from an ongoing survey to discover and measure
the metallicity of z>3 damped Lya systems with the Echellette Spectrograph and
Imager (ESI) on the Keck II telescope. Our motivation arises from a recent
study on the damped Lya systems suggesting only mild evolution in the cosmic
metallicity f... | 0101029v1 |
2002-01-17 | Self-shielding Effects on the Column Density Distribution of Damped Lyman Alpha Systems | We calculate the column density distribution of damped Lyman alpha systems,
modeled as spherical isothermal gaseous halos ionized by the external cosmic
background. The effects of self-shielding introduce a hump in this
distribution, at a column density N_{HI} \sim 1.6x10^{17} X^{-1} cm^{-2}, where
X is the neutral fra... | 0201275v2 |
2002-04-30 | Two-phase equilibrium and molecular hydrogen formation in damped Lyman-alpha systems | Molecular hydrogen is quite underabundant in damped Lyman-alpha systems at
high redshift, when compared to the interstellar medium near the Sun. This has
been interpreted as implying that the gas in damped Lyman-alpha systems is
warm. like the nearby neutral intercloud medium, rather than cool, as in the
clouds which g... | 0204515v1 |
2003-05-12 | Ordinary and Viscosity-Damped MHD Turbulence | We compare the properties of ordinary strong magnetohydrodynamic (MHD)
turbulence in a strongly magnetized medium with the recently discovered
viscosity-damped regime. We focus on energy spectra, anisotropy, and
intermittency. Our most surprising conclusion is that in ordinary strong MHD
turbulence the velocity and mag... | 0305212v2 |
2003-09-17 | Observational Tests of Damping by Resonant Absorption in Coronal Loop Oscillations | One of the proposed damping mechanisms of coronal (transverse) loop
oscillations in the kink-mode is resonant absorption as a result of the Alfven
speed variation at the outer boundary of coronal loops. Analytical expressions
for the period and damping time exist for loop models with thin non-uniform
boundaries. Here w... | 0309470v1 |
2005-03-01 | Metal Abundances in a Damped Lyman-alpha System Along Two Lines of Sight at z=0.93 | We study metal abundances in the z=0.9313 damped Lya system observed in the
two lines-of-sight, A and B, toward the gravitationally-lensed double QSO
HE0512-3329. Spatially resolved STIS spectra constrain the neutral-gas column
density to be LogN(HI)=20.5 in both Aand B. UVES spectra (spectral resolution
FWHM=9.8 km/s)... | 0503026v1 |
2000-08-26 | Adsorbate aggregation and relaxation of low-frequency vibrations | We present a study of resonant vibrational coupling between adsorbates and an
elastic substrate at low macroscopic coverages. In the first part of the paper
we consider the situation when adsorbates form aggregates with high local
coverage. Based upon our previously published theory, we derive formulas
describing the d... | 0008389v1 |
2004-10-26 | Mean-field treatment of the damping of the oscillations of a 1D Bose gas in an optical lattice | We present a theoretical treatment of the surprisingly large damping observed
recently in one-dimensional Bose-Einstein atomic condensates in optical
lattices. We show that time-dependent Hartree-Fock-Bogoliubov (HFB)
calculations can describe qualitatively the main features of the damping
observed over a range of latt... | 0410677v4 |
2006-02-09 | Magnetization damping in polycrystalline Co ultra-thin films: Evidence for non-local effects | The magnetic properties and magnetization dynamics of polycrystalline
ultra-thin Co layers were investigated using a broadband ferromagnetic
resonance (FMR) technique at room temperature. A variable thickness (1 nm $\leq
t \leq$ 10 nm) Co layer is sandwiched between 10 nm thick Cu layers (10 nm Cu|
t Co|10 nm Cu), whil... | 0602243v2 |
1998-10-16 | Fermion Damping in a Fermion-Scalar Plasma | In this article we study the dynamics of fermions in a fermion-scalar plasma.
We begin by obtaining the effective in-medium Dirac equation in real time which
is fully renormalized and causal and leads to the initial value problem. For a
heavy scalar we find the novel result that the decay of the scalar into fermion
pai... | 9810393v2 |
2006-01-06 | Wave energy localization by self-focusing in large molecular structures: a damped stochastic discrete nonlinear Schroedinger equation model | Wave self-focusing in molecular systems subject to thermal effects, such as
thin molecular films and long biomolecules, can be modeled by stochastic
versions of the Discrete Self-Trapping equation of Eilbeck, Lomdahl and Scott,
and this can be approximated by continuum limits in the form of stochastic
nonlinear Schroed... | 0601017v1 |
2007-11-15 | Effect of the steady flow on spatial damping of small-amplitude prominence oscillations | Aims. Taking account of steady flow in solar prominences, we study its
effects on spatial damping of small-amplitude non-adiabatic magnetoacoustic
waves in a homogeneous, isothermal, and unbounded prominence plasma. Methods.
We model the typical feature of observed damped oscillatory motion in
prominences, removing the... | 0711.2353v1 |
2008-02-07 | Cascade and Damping of Alfvén-Cyclotron Fluctuations: Application to Solar Wind Turbulence Spectrum | With the diffusion approximation, we study the cascade and damping of
Alfv\'{e}n-cyclotron fluctuations in solar plasmas numerically. Motivated by
wave-wave couplings and nonlinear effects, we test several forms of the
diffusion tensor. For a general locally anisotropic and inhomogeneous diffusion
tensor in the wave ve... | 0802.0910v1 |
2011-04-13 | Evolution of inclined planets in three-dimensional radiative discs | While planets in the solar system only have a low inclination with respect to
the ecliptic there is mounting evidence that in extrasolar systems the
inclination can be very high, at least for close-in planets. One process to
alter the inclination of a planet is through planet-disc interactions. Recent
simulations consi... | 1104.2408v1 |
2011-07-12 | Mode conversion of radiatively damped magnetogravity waves in the solar chromosphere | Modelling of adiabatic gravity wave propagation in the solar atmosphere
showed that mode conversion to field guided acoustic waves or Alfv\'en waves
was possible in the presence of highly inclined magnetic fields. This work aims
to extend the previous adiabatic study, exploring the consequences of radiative
damping on ... | 1107.2208v1 |
2013-09-23 | Phonon-mediated damping of mechanical vibrations in a finite atomic chain coupled to an outer environment | We study phonon-mediated damping of mechanical vibrations in a finite
quantum-mechanical atomic-chain model. Our study is motivated by the quest to
understand the quality factors (Q) of nanomechanical resonators and
nanoelectromechanical systems (NEMS), as well as actual experiments with
suspended atomic chains and mol... | 1309.5772v1 |
2014-04-01 | Stellar dynamics in gas: The role of gas damping | In this paper, we consider how gas damping affects the dynamical evolution of
gas-embedded star clusters. Using a simple three-component (i.e. one gas and
two stellar components) model, we compare the rates of mass segregation due to
two-body relaxation, accretion from the interstellar medium, and gas dynamical
frictio... | 1404.0379v1 |
2014-04-26 | Landau damping effects on dust-acoustic solitary waves in a dusty negative-ion plasma | The nonlinear theory of dust-acoustic waves (DAWs) with Landau damping is
studied in an unmagnetized dusty negative-ion plasma in the extreme conditions
when the free electrons are absent. The cold massive charged dusts are
described by fluid equations, whereas the two-species of ions (positive and
negative) are descri... | 1404.6623v3 |
2015-03-31 | Damping of Confined Excitations Modes of 1D Condensates in an Optical Lattice | We study the damping of the collective excitations of Bose-Einstein
condensates in a harmonic trap potential loaded in an optical lattice. In the
presence of a confining potential the system is non-homogeneous and the
collective excitations are characterized by a set of discrete confined
phonon-like excitations. We der... | 1503.08884v2 |
2015-08-06 | On the spatial scales of wave heating in the solar chromosphere | Dissipation of magnetohydrodynamic (MHD) wave energy has been proposed as a
viable heating mechanism in the solar chromospheric plasma. Here, we use a
simplified one-dimensional model of the chromosphere to theoretically
investigate the physical processes and the spatial scales that are required for
the efficient dissi... | 1508.01497v1 |
2015-11-11 | A statistical study of decaying kink oscillations detected using SDO/AIA | Despite intensive studies of kink oscillations of coronal loops in the last
decade, a large scale statistically significant investigation of the
oscillation parameters has not been made using data from the Solar Dynamics
Observatory (SDO).
We carry out a statistical study of kink oscillations using Extreme
Ultra-Viol... | 1511.03558v1 |
2016-02-19 | A systematic study of magnetodynamic properties at finite temperatures in doped permalloy from first principles calculations | By means of first principles calculations, we have systematically
investigated how the magnetodynamic properties Gilbert damping, magnetization
and exchange stiffness are affected when permalloy (Py)
(Fe$_{0.19}$Ni$_{0.81}$) is doped with 4d or 5d transition metal impurities. We
find that the trends in the Gilbert damp... | 1602.06201v2 |
2016-03-01 | A comparative study of protocols for secure quantum communication under noisy environment: single-qubit-based protocols versus entangled-state-based protocols | The effect of noise on various protocols of secure quantum communication has
been studied. Specifically, we have investigated the effect of amplitude
damping, phase damping, squeezed generalized amplitude damping, Pauli type as
well as various collective noise models on the protocols of quantum key
distribution, quantu... | 1603.00178v1 |
2016-11-17 | A stable partitioned FSI algorithm for rigid bodies and incompressible flow. Part I: Model problem analysis | A stable partitioned algorithm is developed for fluid-structure interaction
(FSI) problems involving viscous incompressible flow and rigid bodies. This
{\em added-mass partitioned} (AMP) algorithm remains stable, without
sub-iterations, for light and even zero mass rigid bodies when added-mass and
viscous added-damping... | 1611.05711v1 |
2017-01-30 | Torsional Alfvén resonances as an efficient damping mechanism for non-radial oscillations in red giant stars | Stars are self-gravitating fluids in which pressure, buoyancy, rotation and
magnetic fields provide the restoring forces for global modes of oscillation.
Pressure and buoyancy energetically dominate, while rotation and magnetism are
generally assumed to be weak perturbations and often ignored. However,
observations of ... | 1701.08771v1 |
2018-03-30 | Damping of gravitational waves in a viscous Universe and its implication for dark matter self-interactions | It is well known that a gravitational wave (GW) experiences the damping
effect when it propagates in a fluid with nonzero shear viscosity. In this
paper, we propose a new method to constrain the GW damping rate and thus the
fluid shear viscosity. By defining the effective distance which incorporates
damping effects, we... | 1803.11397v1 |
2018-05-29 | Basic microscopic plasma physics from N-body mechanics | Computing is not understanding. This is exemplified by the multiple and
discordant interpretations of Landau damping still present after seventy years.
For long deemed impossible, the mechanical N-body description of this damping,
not only enables its rigorous and simple calculation, but makes unequivocal and
intuitive... | 1805.11408v2 |
2018-08-22 | Constructing a boosted, spinning black hole in the damped harmonic gauge | The damped harmonic gauge is important for numerical relativity computations
based on the generalized harmonic formulation of Einstein's equations, and is
used to reduce coordinate distortions near binary black hole mergers. However,
currently there is no prescription to construct quasiequilibrium binary black
hole ini... | 1808.07490v3 |
2018-12-13 | Neutrino damping in a fermion and scalar background | We consider the propagation of a neutrino in a background composed of a
scalar particle and a fermion using a simple model for the coupling of the form
$\lambda\bar f_R\nu_L\phi$. In the presence of these interactions there can be
damping terms in the neutrino effective potential and index of refraction. We
calculate t... | 1812.05672v2 |
2019-04-25 | High Spin-Wave Propagation Length Consistent with Low Damping in a Metallic Ferromagnet | We report ultra-low intrinsic magnetic damping in
Co$_{\text{25}}$Fe$_{\text{75}}$ heterostructures, reaching the low $10^{-4}$
regime at room temperature. By using a broadband ferromagnetic resonance
technique, we extracted the dynamic magnetic properties of several
Co$_{\text{25}}$Fe$_{\text{75}}$-based heterostructu... | 1904.11321v3 |
2020-04-09 | Magnetic Damping in Epitaxial Fe Alloyed with Vanadium and Aluminum | To develop low-moment, low-damping metallic ferromagnets for power-efficient
spintronic devices, it is crucial to understand how magnetic relaxation is
impacted by the addition of nonmagnetic elements. Here, we compare magnetic
relaxation in epitaxial Fe films alloyed with light nonmagnetic elements of V
and Al. FeV al... | 2004.04840v3 |
2020-09-25 | Temperature dependence of the damping parameter in the ferrimagnet Gd$_3$Fe$_5$O$_{12}$ | The damping parameter ${\alpha}_{\text{FM}}$ in ferrimagnets defined
according to the conventional practice for ferromagnets is known to be strongly
temperature dependent and diverge at the angular momentum compensation
temperature, where the net angular momentum vanishes. However, recent
theoretical and experimental d... | 2009.12073v2 |
2020-09-25 | A Complex Stiffness Human Impedance Model with Customizable Exoskeleton Control | The natural impedance, or dynamic relationship between force and motion, of a
human operator can determine the stability of exoskeletons that use
interaction-torque feedback to amplify human strength. While human impedance is
typically modelled as a linear system, our experiments on a single-joint
exoskeleton testbed i... | 2009.12446v1 |
2020-11-26 | On the stabilization of breather-type solutions of the damped higher order nonlinear Schrödinger equation | Spatially periodic breather solutions (SPBs) of the nonlinear Schr\"o\-dinger
(NLS) equation are frequently used to model rogue waves and are typically
unstable. In this paper we study the effects of dissipation and higher order
nonlinearities on the stabilization of both single and multi-mode SPBs in the
framework of ... | 2011.13334v1 |
2020-12-22 | Comparison of local and global gyrokinetic calculations of collisionless zonal flow damping in quasi-symmetric stellarators | The linear collisionless damping of zonal flows is calculated for
quasi-symmetric stellarator equilibria in flux-tube, flux-surface, and
full-volume geometry. Equilibria are studied from the quasi-helical symmetry
configuration of the Helically Symmetric eXperiment (HSX), a broken symmetry
configuration of HSX, and the... | 2012.12213v2 |
2020-12-31 | Damping of slow surface kink modes in solar photospheric waveguides modeled by one-dimensional inhomogeneities | Given the recent interest in magnetohydrodynamic (MHD) waves in pores and
sunspot umbrae, we examine the damping of slow surface kink modes (SSKMs) by
modeling solar photospheric waveguides with a cylindrical inhomogeneity
comprising a uniform interior, a uniform exterior, and a continuous transition
layer (TL) in betw... | 2012.15426v1 |
2021-02-24 | Finding the mechanism of wave energy flux damping in solar pores using numerical simulations | Context. Solar magnetic pores are, due to their concentrated magnetic fields,
suitable guides for magnetoacoustic waves. Recent observations have shown that
propagating energy flux in pores is subject to strong damping with height;
however, the reason is still unclear. Aims. We investigate possible damping
mechanisms n... | 2102.12420v1 |
2021-09-08 | Room-Temperature Intrinsic and Extrinsic Damping in Polycrystalline Fe Thin Films | We examine room-temperature magnetic relaxation in polycrystalline Fe films.
Out-of-plane ferromagnetic resonance (FMR) measurements reveal Gilbert damping
parameters of $\approx$ 0.0024 for Fe films with thicknesses of 4-25 nm,
regardless of their microstructural properties. The remarkable invariance with
film microst... | 2109.03684v2 |
2022-04-08 | Damped Strichartz estimates and the incompressible Euler--Maxwell system | Euler--Maxwell systems describe the dynamics of inviscid plasmas. In this
work, we consider an incompressible two-dimensional version of such systems and
prove the existence and uniqueness of global weak solutions, uniformly with
respect to the speed of light $c\in (c_0,\infty)$, for some threshold value
$c_0>0$ depend... | 2204.04277v3 |
2022-05-11 | A new look at the frequency-dependent damping of slow-mode waves in the solar corona | Being directly observed in the Doppler shift and imaging data and indirectly
as quasi-periodic pulsations in solar and stellar flares, slow magnetoacoustic
waves offer an important seismological tool for probing many vital parameters
of the coronal plasma. A recently understood active nature of the solar corona
for mag... | 2205.05346v1 |
2022-12-13 | The Effect of Internal Damping on Locomotion in Frictional Environments | The gaits of undulating animals arise from a complex interaction of their
central nervous system, muscle, connective tissue, bone, and environment. As a
simplifying assumption, many previous studies have often assumed that
sufficient internal force is available to produce observed kinematics, thus not
focusing on quant... | 2212.06290v1 |
2023-01-19 | Inverse Problems of Identifying the Unknown Transverse Shear Force in the Euler-Bernoulli Beam with Kelvin-Voigt Damping | In this paper, we study the inverse problems of determining the unknown
transverse shear force $g(t)$ in a system governed by the damped
Euler-Bernoulli equation $\rho(x)u_{tt}+\mu(x)u_t+ (r(x)u_{xx})_{xx}+
(\kappa(x)u_{xxt})_{xx}=0, ~(x,t)\in (0,\ell)\times(0,T],$ subject to the
boundary conditions $u(0,t) =0$, $u_{x}... | 2301.07931v1 |
2023-03-28 | Escape Kinetics of an Underdamped Colloidal Particle from a Cavity through Narrow Pores | It is often desirable to know the controlling mechanism of survival
probability of nano - or microscale particles in small cavities such as, e.g.,
confined submicron particles in fiber beds of high-efficiency filter media or
ions/small molecules in confined cellular structures. Here we address this
issue based on numer... | 2303.16092v1 |
2023-08-22 | Investigating the characteristic shape and scatter of intergalactic damping wings during reionization | Ly$\alpha$ damping wings in the spectra of bright objects at high redshift
are a useful probe of the ionization state of the intergalactic medium during
the reionization epoch. It has recently been noted that, despite the
inhomogeneous nature of reionization, these damping wings have a characteristic
shape which is a s... | 2308.11709v1 |
2023-10-02 | Characterizing the Velocity-Space Signature of Electron Landau Damping | Plasma turbulence plays a critical role in the transport of energy from
large-scale magnetic fields and plasma flows to small scales, where the
dissipated turbulent energy ultimately leads to heating of the plasma species.
A major goal of the broader heliophysics community is to identify the physical
mechanisms respons... | 2310.01242v2 |
2023-10-07 | OEDG: Oscillation-eliminating discontinuous Galerkin method for hyperbolic conservation laws | Controlling spurious oscillations is crucial for designing reliable numerical
schemes for hyperbolic conservation laws. This paper proposes a novel, robust,
and efficient oscillation-eliminating discontinuous Galerkin (OEDG) method on
general meshes, motivated by the damping technique in [Lu, Liu, and Shu, SIAM
J. Nume... | 2310.04807v1 |
2023-12-07 | Probing levitodynamics with multi-stochastic forces and the simple applications on the dark matter detection in optical levitation experiment | If the terrestrial environment is permeated by dark matter, the levitation
experiences damping forces and fluctuations attributed to dark matter. This
paper investigates levitodynamics with multiple stochastic forces, including
thermal drag, photon recoil, feedback, etc., assuming that all of these forces
adhere to the... | 2312.04202v2 |
2024-01-23 | Damped kink motions in a system of two solar coronal tubes with elliptic cross-sections | This study is motivated by observations of coordinated transverse
displacements in neighboring solar active region loops, addressing specifically
how the behavior of kink motions in straight two-tube equilibria is impacted by
tube interactions and tube cross-sectional shapes.We work with linear, ideal,
pressureless mag... | 2401.12885v2 |
1995-02-08 | The Chemical Evolution of Damped Lyman Alpha Galaxies | Measurements of element abundances in damped Lyman alpha systems are
providing new means to investigate the chemical evolution of galaxies,
particularly at early times. We review progress in this area, concentrating on
recent efforts to extend the range of existing surveys to both higher and lower
redshifts. | 9502047v1 |
1996-01-19 | The Chemical Enrichment History of Damped Lyman-alpha Galaxies | Studies of damped Lyman-alpha absorption systems in quasar spectra are
yielding very interesting results regarding the chemical evolution of these
galaxies. We present some preliminary results from such a program. | 9601098v1 |
1997-01-30 | Initial Chemical Enrichment in Galaxies | We present evidence that damped Lyman-alpha galaxies detected in spectra of
quasars may not have started forming stars until the redshift z~3. If damped
Lyman-alpha absorbers are the progenitors of disk galaxies, then the above
result may indicate that star formation in galactic disks first began at z~3. | 9701241v1 |
1997-10-24 | The N/Si Abundance Ratio in Fifteen Damped Lyman-alpha Galaxies: Implications for the Origin of Nitrogen | Galactic chemical evolution model calculations indicate that there should be
considerable scatter in the observed N/O ratios at a fixed metallicity (O/H)
for galaxies with very low metallicities due to the delayed release of primary
N from intermediate mass stars relative to that of O from short-lived massive
stars. Mo... | 9710266v2 |
2001-06-05 | On Nonlinear Alfvén Waves Generated by Cosmic Ray Streaming Instability | Nonlinear damping of parallel propagating Alfv\'en waves in high-$\beta$
plasma is considered. Trapping of thermal ions and Coulomb collisions are taken
into account. Saturated damping rate is calculated. Applications are made for
cosmic ray propagation in the Galaxy. | 0106078v1 |
2001-10-15 | The UCSD HIRES/KeckI Damped Lya Abundance Database: II. The Implications | We present a comprehensive analysis of the damped Lya abundance database
presented in the first paper of this series. This database provides a
homogeneous set of abundance measurements for many elements including Si, Cr,
Ni, Zn, Fe, Al, S, Co, O, and Ar from 38 damped Lya systems with z > 1.5. With
little exception, th... | 0110351v1 |
2005-09-05 | Comment on "Damping of Tensor Modes in Cosmology" | We provide an analytic solution to the short wave length limit of the
integro-differential equation describing the damping of the tensor modes of
gravitational waves. | 0509096v2 |
1997-02-12 | Crossover from coherent to incoherent dynamics in damped quantum systems | The destruction of quantum coherence by environmental influences is
investigated taking the damped harmonic oscillator and the dissipative
two-state system as prototypical examples. It is shown that the location of the
coherent-incoherent transition depends to a large degree on the dynamical
quantity under consideratio... | 9702115v1 |
1998-06-05 | Dielectric formalism and damping of collective modes in trapped Bose-Einstein condensed gases | We present the general dielectric formalism for Bose-Einstein condensed
systems in external potential at finite temperatures. On the basis of a model
arising within this framework as a first approximation in an intermediate
temperature region for large condensate we calculate the damping of low-energy
excitations in th... | 9806079v1 |
1999-05-27 | Do correlations create an energy gap in electronic bilayers? Critical analysis of different approaches | This paper investigates the effect of correlations in electronic bilayers on
the longitudinal collective mode structure. We employ the dielectric
permeability constructed by means of the classical theory of moments. It is
shown that the neglection of damping processes overestimates the role of
correlations. We conclude... | 9905405v1 |
1999-11-16 | Damping of low-energy excitations of a Bose-condensed gas in the hydrodynamic regime | We develop a theory to describe the damping of elementary excitations of a
Bose-condensed gas in the hydrodynamic regime for the thermal cloud. We discuss
second sound in a spatially homogeneous gas and the lowest excitations of a
trapped condensate. | 9911238v2 |
2002-04-18 | Faraday patterns in Bose-Einstein condensates. Amplitude equation for rolls in the parametrically driven, damped Gross-Pitaevskii equation | The parametrically driven, damped Gross-Pitaevskii equation, which models
Bose-Einstein condensates in which the interatomic s-wave scattering length is
modulated in time, is shown to support spatially modulated states in the form
of rolls. A Landau equation with broken phase symmetry is derived, which
governs the dyna... | 0204406v1 |
2002-11-14 | Sound damping in ferrofluids: Magnetically enhanced compressional viscosity | The damping of sound waves in magnetized ferrofluids is investigated and
shown to be considerably higher than in the non-magnetized case. This fact may
be interpreted as a field-enhanced, effective compressional viscosity -- in
analogy to the ubiquitous field-enhanced shear viscosity that is known to be
the reason for ... | 0211297v1 |
2003-10-23 | Input and output in damped quantum systems III: Formulation of damped systems driven by Fermion fields | A comprehensive input-output theory is developed for Fermionic input fields.
Quantum stochastic differential equations are developed in both the Ito and
Stratonovich forms. The major technical issue is the development of a formalism
which takes account of anticommutation relations between the Fermionic driving
field an... | 0310542v1 |
2004-01-12 | Nonexponential motional damping of impurity atoms in Bose-Einstein condensates | We demonstrate that the damping of the motion of an impurity atom injected at
a supercritical velocity into a Bose-Einstein condensate can exhibit
appreciable deviation from the exponential law on time scales of $10^{-5}$ s. | 0401172v1 |
2005-02-21 | Two Transitions in the Damping of a Unitary Fermi Gas | We measure the temperature dependence of the radial breathing mode in an
optically trapped, strongly-interacting Fermi gas of $^6$Li, just above the
center of a broad Feshbach resonance. The frequency remains close to the
unitary hydrodynamic value, while the damping rate reveals transitions at two
well-separated tempe... | 0502507v1 |
2005-05-10 | Fluctuation-dissipation considerations and damping models for ferromagnetic materials | The role of fluctuation-dissipation relations (theorems) for the
magnetization dynamics with Landau-Lifshitz-Gilbert and Bloch-Bloembergen
damping terms are discussed. We demonstrate that the use of the Callen-Welton
fluctuation-dissipation theorem that was proven for Hamiltonian systems can
give an inconsistent result... | 0505259v1 |
1994-07-04 | Cat States and Single Runs for the Damped Harmonic Oscillator | We discuss the fate of initial states of the cat type for the damped harmonic
oscillator, mostly employing a linear version of the stochastic Schr\"odinger
equation. We also comment on how such cat states might be prepared and on the
relation of single realizations of the noise to single runs of experiments. | 9407001v1 |
2000-10-27 | Damping and the Hartree Ensemble Approximation | We study a Hartree ensemble approximation for real-time dynamics in the toy
model of 1+1 dimensional scalar field theory. Damping behavior seen in
numerical simulations is compared with analytical predictions based on
perturbation theory in the original (non-Hartree-approximated) model. | 0010054v1 |
1995-03-21 | APPLICATIONS OF HIGH-TEMPERATURE FIELD THEORY TO HEAVY-ION COLLISIONS | A recent development in finite temperature field theory, the so-called
Braaten-Pisarski method, and its application to properties of a quark-gluon
plasma, possibly formed in relativistic heavy ion collisions, are reviewed. In
particular parton damping rates, the energy loss of energetic partons,
thermalization times, v... | 9503400v1 |
1996-03-19 | Damping Rate and Lyapunov Exponent of a Higgs Field at High Temperature | The damping rate of a Higgs field at zero momentum is calculated using the
Braaten-Pisarski method and compared to the Lyapunov exponent of the classical
SU(2) Yang-Mills Higgs system. | 9603339v1 |
1997-04-30 | Comments on the Erhan-Schlein model of damping the pomeron flux at small x-pomeron | We explore the theoretical and experimental consequences of a model proposed
by Samim Erhan and Peter Schlein for unitarizing the diffractive amplitude by
damping the pomeron flux at small x-pomeron and conclude that the model is
unphysical and contradicts well established experimental data. | 9704454v1 |
1998-03-26 | The Nonlinear Spatial Damping Rate in QGP | The derivative expansion method has been used to solve the semiclassical
kinetic equations of quark-gluon plasma (QGP). The nonlinear spatial damping
rate, the imaginary part of the wave vector, for the longitudinal secondary
color waves in the long wavelength limit has been calculated numerically. | 9803455v1 |
2006-07-27 | Long-Time Asymptotic Behavior of Dissipative Boussinesq System | In this paper, we study various dissipative mechanics associated with the
Boussinesq systems which model two-dimensional small amplitude long wavelength
water waves. We will show that the decay rate for the damped one-directional
model equations, such as the KdV and BBM equations, holds for some of the
damped Boussines... | 0607708v1 |
2006-12-27 | Stochastic inertial manifolds for damped wave equations | In this paper, stochastic inertial manifold for damped wave equations
subjected to additive white noise is constructed by the Lyapunov-Perron method.
It is proved that when the intensity of noise tends to zero the stochastic
inertial manifold converges to its deterministic counterpart almost surely. | 0612774v1 |
2007-01-19 | On the Domain of Analyticity and Small Scales for the Solutions of the Damped-driven 2D Navier-Stokes Equations | We obtain a logarithmically sharp estimate for the space-analyticity radius
of the solutions of the damped-driven 2D Navier-Stokes equations with periodic
boundary conditions and relate this to the small scales in this system. This
system is inspired by the Stommel--Charney barotropic ocean circulation model. | 0701530v1 |
2002-09-04 | Wigner function for damped systems | Both classical and quantum damped systems give rise to complex spectra and
corresponding resonant states. We investigate how resonant states, which do not
belong to the Hilbert space, fit the phase space formulation of quantum
mechanics. It turns out that one may construct out of a pair of resonant states
an analog of ... | 0209008v1 |
2004-12-14 | Two-Ion Dusty Plasma Waves and Landau Damping | The paper analyses the properties of dusty plasmas in the extreme conditions
when the free electrons are absent. The nonlinear Korteveg de Vries equation
with a nonlocal (integral) term in a small parameter approximation is derived.
The conditions are determined when the integral term is essential hence the
Landau damp... | 0412033v1 |
2002-10-16 | Dependence of Nuclear Level Density on Vibrational State Damping | The response function approach is proposed to include vibrational state in
calculation of level density. The calculations show rather strong dependence of
level density on the relaxation times of collective state damping. | 0210048v1 |
1999-02-09 | One-Dimensional Motion of Sommerfeld Sphere in Potential Hole in Classical Electrodynamics: Inside the Hole | Equation of motion of Sommerfeld sphere in the one-dimensional potential
hole, produced by two equal charges on some distance from each other, is
numerically investigated. Two types of solutions are found: (i) damping
oscillations, (ii) oscillations without damping (radiationless motion).
Solutions with growing amplitu... | 9902018v3 |
2000-03-23 | The Hawking-Unruh Temperature and Damping in a Linear Focusing Channel | The Hawking-Unruh effective temperature, hbar a* / 2 pi c k, due to quantum
fluctuations in the radiation of an accelerated charged-particle beam can be
used to show that transverse oscillations of the beam in a practical linear
focusing channel damp to the quantum-mechanical limit. A comparison is made
between this be... | 0003061v1 |
2003-06-17 | Ruchhardt Oscillator Decay- Thermodynamic basis for Hysteretic Damping | Using thermodynamic arguments based on the ideal gas law, it is shown that
hysteretic (also called structural) damping is the natural form of energy
dissipation for this classic oscillator that is used to measure the ratio of
heat capacities for a gas. | 0306136v1 |
2005-08-25 | Rutherford scattering with radiation damping | We study the effect of radiation damping on the classical scattering of
charged particles. Using a perturbation method based on the Runge-Lenz vector,
we calculate radiative corrections to the Rutherford cross section, and the
corresponding energy and angular momentum losses. | 0508186v2 |
1997-03-27 | Macroscopic quantum damping in SQUID rings | The measurement process is introduced in the dynamics of Josephson devices
exhibiting quantum behaviour in a macroscopic degree of freedom. The
measurement is shown to give rise to a dynamical damping mechanism whose
experimental observability could be relevant to understand decoherence in
macroscopic quantum systems. | 9703052v1 |
2005-07-19 | Radiation reaction and quantum damped harmonic oscillator | By taking a Klein-Gordon field as the environment of an harmonic oscillator
and using a new method for dealing with quantum dissipative systems (minimal
coupling method), the quantum dynamics and radiation reaction for a quantum
damped harmonic oscillator investigated. Applying perturbation method, some
transition prob... | 0507179v1 |
2005-08-18 | Density operator and entropy of the damped quantum harmonic oscillator | The expression for the density operator of the damped harmonic oscillator is
derived from the master equation in the framework of the Lindblad theory for
open quantum systems. Then the von Neumann entropy and effective temperature of
the system are obtained. The entropy for a state characterized by a Wigner
distributio... | 0508141v1 |
2006-03-03 | On the damping of the angular momentum of three harmonic oscillators | In the frame of the Lindblad theory of open quantum systems, the system of
three uncoupled harmonic oscillators with opening operators linear in the
coordinates and momenta of the considered system is analyzed. The damping of
the angular momentum and of its projection is obtained. | 0603029v1 |
2006-10-10 | Simultaneous amplification and non-symmetric amplitude damping of two-mode Gaussian state | The evolution of two-mode Gaussian state under symmetric amplification,
non-symmetric damping and thermal noise is studied. The time dependent solution
of the state characteristic function is obtained. The separability criterions
are given for the final state of weak amplification as well as strong
amplification. | 0610070v1 |
2007-10-13 | The separability of tripartite Gaussian state with amplification and amplitude damping | Tripartite three mode Gaussian state undergoes parametric amplification and
amplitude damping as well as thermal noise is studied. In the case of a state
totally symmetrically interacting with the environment, the time dependent
correlation matrix of the state in evolution is given. The conditions for fully
separabilit... | 0710.2570v1 |
2007-12-16 | Nonadditive quantum error correcting codes adapted to the ampltitude damping channel | A family of high rate quantum error correcting codes adapted to the amplitude
damping channel is presented. These codes are nonadditive and exploit
self-complementarity structure to correct all first-order errors. Their rates
can be higher than 1/2. The recovery operations of these codes can be generated
by a simple al... | 0712.2586v1 |
2007-12-22 | Chaos in an intermittently driven damped oscillator | We observe chaotic dynamics in a damped linear oscillator, which is driven
only at certain regions of phase space. Both deterministic and random drives
are studied. The dynamics is characterized using standard techniques of
nonlinear dynamics. Interchanging roles of determinism and stochasticity is
also considered. | 0712.3827v2 |
2008-03-01 | Well-posedness of the IBVP for 2-D Euler Equations with Damping | In this paper we focus on the initial-boundary value problem of the 2-D
isentropic Euler equations with damping. We prove the global-in-time existence
of classical solution to the initial-boundary value problem by the method of
energy estimates. | 0803.0039v1 |
2008-03-27 | Shear viscosity of degenerate electron matter | We calculate the partial electron shear viscosity $\eta_{ee}$ limited by
electron-electron collisions in a strongly degenerate electron gas taking into
account the Landau damping of transverse plasmons. The Landau damping strongly
suppresses $\eta_{ee}$ in the domain of ultrarelativistic degenerate electrons
and modifi... | 0803.3893v1 |
2008-04-09 | Stationary Oscillations in a Damped Wave Equation from Isospectral Bessel Functions | Using the isospectral partners of the Bessel functions derived by Reyes et
al., we find, on one hand, that these functions show non-typical supersymmetric
(SUSY) behavior and, on the other, that the isospectral partner of the
classical wave equation is equivalent to that of a damped system whose
oscillations do not van... | 0804.1510v1 |
2008-06-03 | Simulation study of fast ion instability in the ILC damping ring and PETRA III | The fast ion instability is simulated in different gas pressures and fill
patterns for the damping ring of the International Linear Collider (ILC) and
PETRA III respectively. Beam size variation due to beta function and dispersion
function change is taken into account. Feedback is also applied in the
simulation. | 0806.0529v1 |
2008-08-01 | Damped wave equations with dynamic boundary conditions | We discuss several classes of linear second order initial-boundary value
problems, where damping terms appear in the main wave equation as well as in
the dynamic boundary condition. We investigate their well-posedness and
describe some qualitative properties of their solutions, including boundedness,
stability, or almo... | 0808.0213v1 |
2008-12-17 | The damping of gravitational waves in dust | We examine a simple model of interaction of gravitational waves with matter
(primarily represented by dust). The aim is to investigate a possible damping
effect on the intensity of gravitational wave when passing through media. This
might be important for gravitational wave astronomy when the sources are
obscured by du... | 0812.3336v1 |
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