publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2019-01-17 | Influences of interfacial oxidization on surface magnetic energy, magnetic damping and spin-orbit-torques in Pt / ferromagnet / capping structures | We investigate the effect of capping layer (CAP) on the interfacial magnetic
anisotropy energy density (K_S), magnetic damping ({\alpha}), and spin-orbit
torques (SOTs) in heavy-metal (Pt) / ferromagnet (Co or Py) / CAP (MgO/Ta,
HfOx, or TaN). At room temperature (RT) the CAP materials influence the
effective magnitude... | 1901.05777v1 |
2019-05-31 | The amplitude of solar p-mode oscillations from three-dimensional convection simulations | The amplitude of solar p-mode oscillations is governed by stochastic
excitation and mode damping, both of which take place in the surface convection
zone. However, the time-dependent, turbulent nature of convection makes it
difficult to self-consistently study excitation and damping processes through
the use of traditi... | 1905.13397v2 |
2019-08-23 | Damping enhancement in coherent ferrite/insulating-paramagnet bilayers | High-quality epitaxial ferrites, such as low-damping MgAl-ferrite (MAFO), are
promising nanoscale building blocks for all-oxide heterostructures driven by
pure spin current. However, the impact of oxide interfaces on spin dynamics in
such heterostructures remains an open question. Here, we investigate the spin
dynamics... | 1908.08629v2 |
2019-10-03 | Many-body collision contributions to electron momentum damping rates in a plasma influenced by electron strong coupling | Experimental studies of electron-ion collision rates in an ultracold neutral
plasma (UNP) can be conducted through measuring the rate of electron plasma
oscillation damping. For sufficiently cold and dense conditions where strong
coupling influences are important, the measured damping rate was faster by 37\%
than theor... | 1910.01707v1 |
2019-10-18 | Escape of a forced-damped particle from weakly nonlinear truncated potential well | Escape from a potential well is an extreme example of transient behavior. We
consider the escape of the harmonically forced particle under viscous damping
from the benchmark truncated weakly nonlinear potential well. Main attention is
paid to most interesting case of primary 1:1 resonance. The treatment is based
on mul... | 1910.08545v1 |
2019-10-24 | Topological damping Rashba spin orbit torque in ballistic magnetic domain walls | Rashba spin orbit torque derived from the broken inversion symmetry at
ferromagnet/heavy metal interfaces has potential application in spintronic
devices. In conventional description of the precessional and damping components
of the Rashba spin orbit torque in magnetization textures, the decomposition
coefficients are ... | 1910.10977v2 |
2019-11-02 | Tuning Non-Gilbert-type damping in FeGa films on MgO(001) via oblique deposition | The ability to tailor the damping factor is essential for spintronic and
spin-torque applications. Here, we report an approach to manipulate the damping
factor of FeGa/MgO(001) films by oblique deposition. Owing to the defects at
the surface or interface in thin films, two-magnon scattering (TMS) acts as a
non-Gilbert ... | 1911.00728v1 |
2019-11-13 | Dipole oscillations of fermionic superfluids along the BEC-BCS crossover in disordered potentials | We investigate dipole oscillations of ultracold Fermi gases along the BEC-BCS
crossover through disordered potentials. We observe a disorder-induced damping
of oscillations as well as a change of the fundamental Kohn-mode frequency. The
measurement results are compared to numerical density matrix renormalization
group ... | 1911.05638v1 |
2020-02-07 | Model of damping and anisotropy at elevated temperatures: application to granular FePt films | Understanding the damping mechanism in finite size systems and its dependence
on temperature is a critical step in the development of magnetic
nanotechnologies. In this work, nano-sized materials are modeled via atomistic
spin dynamics, the damping parameter being extracted from Ferromagnetic
Resonance (FMR) simulation... | 2002.02865v1 |
2020-04-06 | Damping-like Torque in Monolayer 1T-TaS$_2$ | A damping-like spin orbit torque (SOT) is a prerequisite for ultralow power
spin logic devices. Here, we report on the damping-like SOT in just one
monolayer of the conducting transition metal dichalcogenide (TMD) TaS$_2$
interfaced with a NiFe (Py) ferromagnetic layer. The charge-spin conversion
efficiency is found to... | 2004.02649v1 |
2020-05-15 | Calibration and performance of the neutron detector onboard of the DAMPE mission | The DArk Matter Particle Explorer (DAMPE), one of the four space-based
scientific missions within the framework of the Strategic Pioneer Program on
Space Science of the Chinese Academy of Sciences, has been successfully
launched on Dec. 17th 2015 from Jiuquan launch center. One of the most
important scientific goals of... | 2005.07828v1 |
2020-05-16 | Simultaneous observation of anti-damping and inverse spin Hall effect in La$_{0.67}$Sr$_{0.33}$MnO$_{3}$/Pt bilayer system | Manganites have shown potential in spintronics because they exhibit high spin
polarization. Here, by ferromagnetic resonance we have studied the damping
properties of La$_{0.67}$Sr$_{0.33}$MnO$_{3}$/Pt bilayers which are prepared by
oxide molecular beam epitaxy. The damping coefficient ($\alpha$) of
La$_{0.67}$Sr$_{0.3... | 2005.07848v3 |
2020-07-25 | Using a Lindbladian approach to model decoherence in two coupled nuclear spins via correlated phase-damping and amplitude damping noise channels | In this work, we studied the relaxation dynamics of coherences of different
order present in a system of two coupled nuclear spins. We used a previously
designed model for intrinsic noise present in such systems which considers the
Lindblad master equation for Markovian relaxation. We experimentally created
zero-, sing... | 2007.12972v1 |
2020-09-29 | The effects of nonlinear damping on degenerate parametric amplification | This paper considers the dynamic response of a single degree of freedom
system with nonlinear stiffness and nonlinear damping that is subjected to both
resonant direct excitation and resonant parametric excitation, with a general
phase between the two. This generalizes and expands on previous studies of
nonlinear effec... | 2009.14284v2 |
2020-11-10 | Damped oscillators within the general theory of Casimir and van der Waals forces | It is demonstrated that the general theory of Casimir and van der Waals
forces describes the interaction-induced equilibrium thermodynamic potentials
of the damped harmonic oscillator bilinearly coupled to the environment. An
extended model for a damped oscillator is suggested along the lines of the
general theory of C... | 2011.04960v2 |
2021-01-03 | The effect of flow on resonant absorption of slow MHD waves in magnetic flux tubes | In this paper, we study kink and sausage oscillations in the presence of
longitudinal background flow. We study resonant absorption of the kink and
sausage modes in the slow continuum under magnetic pore conditions in the
presence of flow. we determine the dispersion relation then solve it
numerically, and find the fre... | 2101.02064v1 |
2021-02-01 | Blow-up and lifespan estimates for a damped wave equation in the Einstein-de Sitter spacetime with nonlinearity of derivative type | In this article, we investigate the blow-up for local solutions to a
semilinear wave equation in the generalized Einstein - de Sitter spacetime with
nonlinearity of derivative type. More precisely, we consider a semilinear
damped wave equation with a time-dependent and not summable speed of
propagation and with a time-... | 2102.01137v2 |
2021-02-02 | Analysis of Lower Hybrid Drift Waves in Kappa Distributions over Solar Atmosphere | Kappa distributions and with loss cone features have been frequently observed
with flares emissions with the signatures of Lower hybrid waves. We have
analysed the plasma with Kappa distributions and with loss cone features for
the drift wave instabilities in perpendicular propagation for Large flare and
Normal flare a... | 2102.01323v1 |
2021-02-25 | Regularity and stability of the semigroup associated with some interacting elastic systems I: A degenerate damping case | In this paper, we examine regularity and stability issues for two damped
abstract elastic systems. The damping involves the average velocity and a
fractional power $\theta$, with $\theta$ in $[-1,1]$, of the principal
operator. The matrix operator defining the damping mechanism for the coupled
system is degenerate. Fir... | 2102.13217v4 |
2021-03-05 | Existence and congruence of global attractors for damped and forced integrable and nonintegrable discrete nonlinear Schrödinger equations | We study two damped and forced discrete nonlinear Schr\"odinger equations on
the one-dimensional infinite lattice. Without damping and forcing they are
represented by the integrable Ablowitz-Ladik equation (AL) featuring non-local
cubic nonlinear terms, and its standard (nonintegrable) counterpart with local
cubic nonl... | 2103.03533v1 |
2021-05-17 | Dissipation of Oscillation Energy and Distribution of Damping Power in a Multimachine Power System: A Small-signal Analysis | This paper revisits the concept of damping torque in a multimachine power
system and its relation to the dissipation of oscillation energy in synchronous
machine windings. As a multimachine extension of an existing result on a
single-machine-infinite-bus (SMIB) system, we show that the total damping power
for a mode st... | 2105.07618v2 |
2021-06-04 | Imaging spin-wave damping underneath metals using electron spins in diamond | Spin waves in magnetic insulators are low-damping signal carriers that could
enable a new generation of spintronic devices. The excitation, control, and
detection of spin waves by metal electrodes is crucial for interfacing these
devices to electrical circuits. It is therefore important to understand
metal-induced damp... | 2106.02508v2 |
2021-06-04 | Inherent Non-Linear Damping in Resonators with Inertia Amplification | Inertia amplification is a mechanism coupling degrees of freedom within a
vibrating structure. Its goal is to achieve an apparent high dynamic mass and,
accordingly, a low resonance frequency. Such structures have been described for
use in locally resonant metamaterials and phononic crystals to lower the
starting frequ... | 2106.02576v2 |
2021-06-30 | On the effect of perturbations in first-order optimization methods with inertia and Hessian driven damping | Second-order continuous-time dissipative dynamical systems with viscous and
Hessian driven damping have inspired effective first-order algorithms for
solving convex optimization problems. While preserving the fast convergence
properties of the Nesterov-type acceleration, the Hessian driven damping makes
it possible to ... | 2106.16159v2 |
2021-07-02 | Anomalous Gilbert Damping and Duffing Features of the SFS {\boldmath $\varphi_0$} Josephson Junction | We demonstrate unusual features of phase dynamics, IV-characteristics and
magnetization dynamics of the $\varphi_0$ Josephson junction at small values of
spin-orbit interaction, ratio of Josephson to magnetic energy and Gilbert
damping. In particular, an anomalous shift of the ferromagnetic resonance
frequency with an ... | 2107.00982v3 |
2021-07-13 | A new approach to the quantization of the damped harmonic oscillator | In this paper, a new approach for constructing Lagrangians for driven and
undriven linearly damped systems is proposed, by introducing a redefined time
coordinate and an associated coordinate transformation to ensure that the
resulting Lagrangian satisfies the Helmholtz conditions. The approach is
applied to canonicall... | 2107.05827v3 |
2021-10-26 | Theory of sound attenuation in amorphous solids from nonaffine motions | We present a theoretical derivation of acoustic phonon damping in amorphous
solids based on the nonaffine response formalism for the viscoelasticity of
amorphous solids. The analytical theory takes into account the nonaffine
displacements in transverse waves and is able to predict both the ubiquitous
low-energy diffusi... | 2110.13446v2 |
2021-11-21 | Energy Transport in 1-Dimensional Oscillator Arrays With Hysteretic Damping | Energy transport in 1-dimensional oscillator arrays has been extensively
studied to date in the conservative case, as well as under weak viscous
damping. When driven at one end by a sinusoidal force, such arrays are known to
exhibit the phenomenon of supratransmission, i.e. a sudden energy surge above a
critical drivin... | 2111.10816v3 |
2021-12-15 | An Innovative Transverse Emittance Cooling Technique using a Laser-Plasma Wiggler | We propose an innovative beam cooling scheme based on laser driven plasma
wakefields to address the challenge of high luminosity generation for a future
linear collider. For linear colliders, beam cooling is realised by means of
damping rings equipped with wiggler magnets and accelerating cavities. This
scheme ensures ... | 2112.08163v1 |
2021-12-21 | ISS-Based Robustness to Various Neglected Damping Mechanisms for the 1-D Wave PDE | This paper is devoted to the study of the robustness properties of the 1-D
wave equation for an elastic vibrating string under four different damping
mechanisms that are usually neglected in the study of the wave equation: (i)
friction with the surrounding medium of the string (or viscous damping), (ii)
thermoelastic p... | 2112.11287v1 |
2022-01-20 | Derivation of the linear Boltzmann equation from the damped quantum Lorentz gas with a general scatterer configuration | It is a fundamental problem in mathematical physics to derive macroscopic
transport equations from microscopic models. In this paper we derive the linear
Boltzmann equation in the low-density limit of a damped quantum Lorentz gas for
a large class of deterministic and random scatterer configurations. Previously
this re... | 2201.08229v2 |
2022-01-22 | Effect of MagneticField on the Damping Behavior of a Ferrofluid based Damper | This paper is an extension of our earlier work where we had reported a proof
of concept for a ferrofluid based damper. The damper used ferrofluid as damping
medium and it was seen that damping efficiency of the damper changes on
application of magnetic field. The present paper deals with a systematic study
of the effec... | 2201.09027v1 |
2022-01-28 | Machine learning-based method of calorimeter saturation correction for helium flux analysis with DAMPE experiment | DAMPE is a space-borne experiment for the measurement of the cosmic-ray
fluxes at energies up to around 100 TeV per nucleon. At energies above several
tens of TeV, the electronics of DAMPE calorimeter would saturate, leaving
certain bars with no energy recorded. In the present work we discuss the
application of machine... | 2201.12185v3 |
2022-03-10 | Accelerated gradient methods combining Tikhonov regularization with geometric damping driven by the Hessian | In a Hilbert setting, for convex differentiable optimization, we consider
accelerated gradient dynamics combining Tikhonov regularization with
Hessian-driven damping. The Tikhonov regularization parameter is assumed to
tend to zero as time tends to infinity, which preserves equilibria. The
presence of the Tikhonov regu... | 2203.05457v2 |
2022-04-01 | On the Importance of High-Frequency Damping in High-Order Conservative Finite-Difference Schemes for Viscous Fluxes | This paper discusses the importance of high-frequency damping in high-order
conservative finite-difference schemes for viscous terms in the Navier-Stokes
equations. Investigating nonlinear instability encountered in a high-resolution
viscous shock-tube simulation, we have discovered that a modification to the
viscous s... | 2204.00393v1 |
2022-06-20 | Stability and Damping in the Disks of Massive Galaxies | After their initial formation, disk galaxies are observed to be rotationally
stable over periods of >6 Gyr, implying that any large velocity disturbances of
stars and gas clouds are damped rapidly on the timescale of their rotation.
However, it is also known that despite this damping, there must be a degree of
random l... | 2206.09671v2 |
2022-08-25 | The Effect of Frequency Droop Damping on System Parameters and Battery Sizing During Load Change Condition | Inverter-based resources (IBR) have been widely studied for their advantages
on the current power systems. This increase in the penetration of renewable
energy has raised some concerns about the stability of the existing grid.
Historically, power systems are dominated by synchronous generators that can
easily react to ... | 2208.12291v1 |
2022-09-15 | Superfluid $^4$He as a rigorous test bench for different damping models in nanoelectromechanical resonators | We have used nanoelectromechanical resonators to probe superfluid $^4$He at
different temperature regimes, spanning over four orders of magnitude in
damping. These regimes are characterized by the mechanisms which provide the
dominant contributions to damping and the shift of the resonance frequency:
tunneling two leve... | 2209.07229v2 |
2022-10-16 | Magnetic damping anisotropy in the two-dimensional van der Waals material Fe$_3$GeTe$_2$ from first principles | Magnetization relaxation in the two-dimensional itinerant ferromagnetic van
der Waals material Fe$_3$GeTe$_2$, below the Curie temperature, is
fundamentally important for applications to low-dimensional spintronics
devices. We use first-principles scattering theory to calculate the
temperature-dependent Gilbert damping... | 2210.08429v1 |
2022-11-08 | On the injection scale of the turbulence in the partially ionized very local interstellar medium | The cascade of magnetohydrodynamic (MHD) turbulence is subject to ion-neutral
collisional damping and neutral viscous damping in the partially ionized
interstellar medium. By examining the damping effects in the warm and partially
ionized local interstellar medium, we find that the interstellar turbulence is
damped by ... | 2211.04496v1 |
2022-12-11 | The overtone level spacing of a black hole quasinormal frequencies: a fingerprint of a local $SL(2,\mathbb{R})$ symmetry | The imaginary part of the quasinormal frequencies spectrum for a static and
spherically symmetric black hole is analytically known to be equally spaced,
both for the highly damped and the weakly damped families of quasinormal modes.
Some interesting attempts have been made in the last twenty years to understand
in simp... | 2212.05538v1 |
2022-12-15 | Formation of shifted shock for the 3D compressible Euler equations with time-dependent damping | In this paper, we show the shock formation to the compressible Euler
equations with time-dependent damping $\frac{a\p u}{(1+t)^{\lam}}$ in three
spatial dimensions without any symmetry conditions. It's well-known that for
$\lam>1$, the damping is too weak to prevent the shock formation for suitably
large data. However,... | 2212.07828v1 |
2023-01-15 | Damped-driven system of bouncing droplets leading to deterministic diffusive behavior | Damped-driven systems are ubiquitous in science, however the damping and
driving mechanisms are often quite convoluted. This manuscript presents an
experimental and theoretical investigation of a fluidic droplet on a vertically
vibrating fluid bath as a damped-driven system. We study a fluidic droplet in
an annular cav... | 2301.06041v2 |
2023-03-01 | Generation of intraparticle quantum correlations in amplitude damping channel and its robustness | Quantum correlations between two or more different degrees of freedom of the
same particle is sometimes referred to as intraparticle entanglement. In this
work, we study these intra-particle correlations between two different degrees
of freedom under various decoherence channels viz. amplitude damping,
depolarising and... | 2303.01238v1 |
2023-03-07 | Electrically tunable Gilbert damping in van der Waals heterostructures of two-dimensional ferromagnetic metals and ferroelectrics | Tuning the Gilbert damping of ferromagnetic (FM) metals via a nonvolatile way
is of importance to exploit and design next-generation novel spintronic
devices. Through systematical first-principles calculations, we study the
magnetic properties of the van der Waals heterostructure of two-dimensional FM
metal CrTe2 and f... | 2303.03852v1 |
2023-03-16 | Quantum Brownian Motion in the Caldeira-Leggett Model with a Damped Environment | We model a quantum system coupled to an environment of damped harmonic
oscillators by following the approach of Caldeira-Leggett and adopting the
Caldirola-Kanai Lagrangian for the bath oscillators. In deriving the master
equation of the quantum system of interest (a particle in a general potential),
we show that the p... | 2303.09516v1 |
2023-03-22 | A Numerical Study of Landau Damping with PETSc-PIC | We present a study of the standard plasma physics test, Landau damping, using
the Particle-In-Cell (PIC) algorithm. The Landau damping phenomenon consists of
the damping of small oscillations in plasmas without collisions. In the PIC
method, a hybrid discretization is constructed with a grid of finitely
supported basis... | 2303.12620v1 |
2023-04-07 | Shifted shock formation for the 3D compressible Euler equations with damping and variation of the vorticity | In this paper, we consider the shock formation problem for the
3-dimensional(3D) compressible Euler equations with damping inspired by the
work \cite{BSV3Dfulleuler}. It will be shown that for a class of large data,
the damping can not prevent the formation of point shock, and the damping
effect shifts the shock time a... | 2304.03506v2 |
2023-07-05 | Bayesian evidence for two slow-wave damping models in hot coronal loops | We compute the evidence in favour of two models, one based on field-aligned
thermal conduction alone and another that includes thermal misbalance as well,
in explaining the damping of slow magneto-acoustic waves in hot coronal loops.
Our analysis is based on the computation of the marginal likelihood and the
Bayes fact... | 2307.02439v1 |
2023-07-24 | From characteristic functions to multivariate distribution functions and European option prices by the damped COS method | We provide a unified framework for the computation of the distribution
function and the computation of prices of financial options from the
characteristic function of some density by the COS method. The classical COS
method is numerically very efficient in one-dimension but cannot deal very well
with certain financial ... | 2307.12843v6 |
2023-07-26 | A Nonlinear Damped Metamaterial: Wideband Attenuation with Nonlinear Bandgap and Modal Dissipation | In this paper, we incorporate the effect of nonlinear damping with the
concept of locally resonant metamaterials to enable vibration attenuation
beyond the conventional bandgap range. The proposed design combines a linear
host cantilever beam and periodically distributed inertia amplifiers as
nonlinear local resonators... | 2307.14165v2 |
2023-07-28 | Premature jump-down mimicks nonlinear damping in nanoresonators | Recent experiments on nano-resonators in a bistable regime use the
`jump-down' point between states to infer mechanical properties of the membrane
or a load, but often suggest the presence of some nonlinear damping. Motivated
by such experiments, we develop a mechanical model of a membrane subject to a
uniform, oscilla... | 2307.15656v1 |
2023-09-22 | Long time energy averages and a lower resolvent estimate for damped waves | We consider the damped wave equation on a compact manifold. We propose
different ways of measuring decay of the energy (time averages of lower energy
levels, decay for frequency localized data...) and exhibit links with resolvent
estimates on the imaginary axis. As an application we prove a universal
logarithmic lower ... | 2309.12709v1 |
2023-10-11 | Damping Density of an Absorptive Shoebox Room Derived from the Image-Source Method | The image-source method is widely applied to compute room impulse responses
(RIRs) of shoebox rooms with arbitrary absorption. However, with increasing RIR
lengths, the number of image sources grows rapidly, leading to slow
computation. In this paper, we derive a closed-form expression for the damping
density, which ch... | 2310.07363v1 |
2023-10-14 | Exploring Damping Effect of Inner Control Loops for Grid-Forming VSCs | This paper presents an analytical approach to explore the damping effect of
inner loops on grid-forming converters. First, an impedance model is proposed
to characterize the behaviors of inner loops, thereby illustrating their
influence on output impedance shaping. Then, based on the impedance
representation, the compl... | 2310.09660v1 |
2023-10-24 | Frictional weakening of a granular sheared layer due to viscous rolling revealed by Discrete Element Modeling | Considering a 3D sheared granular layer modeled with discrete elements, it is
well known the rolling resistance significantly influences the mechanical
behavior. Even if the rolling resistance role has been deeply investigated as
it is commonly used to represent the the roughness of the grains and the
interparticle loc... | 2310.15945v1 |
2023-12-12 | Coordination of Damping Controllers: A Data-Informed Approach for Adaptability | This work proposes a data-informed approach for an adaptable coordination of
damping controllers. The novel concept of coordination is based on minimizing
the Total Action, a single metric that measures the system's dynamic response
post-disturbance. This is a performance measure based on the physics of the
power syste... | 2312.07739v1 |
2024-01-26 | Efficient Control of Magnetization Dynamics Via W/CuO$_\text{x}$ Interface | Magnetization dynamics, which determine the speed of magnetization switching
and spin information propagation, play a central role in modern spintronics.
Gaining its control will satisfy the different needs of various spintronic
devices. In this work, we demonstrate that the surface oxidized Cu
(CuO$_\text{x}$) can be ... | 2401.14708v1 |
2024-02-08 | The stability analysis based on viscous theory of Faraday waves in Hele-Shaw cells | The linear instability of Faraday waves in Hele-Shaw cells is investigated
with consideration of the viscosity of fluids after gap-averaging the governing
equations due to the damping from two lateral walls and the dynamic behavior of
contact angle. A new hydrodynamic model is thus derived and solved
semi-analytically.... | 2402.05505v2 |
2024-04-08 | Stability Enhancement of LCL-Type Grid-Following Inverters Using Capacitor Voltage Active Damping | An LCL filter offers superior attenuation for high-frequency harmonics for
three-phase grid-following inverters compared to LC and L filters. However, it
also introduces an inherent resonance peak, which can lead to power quality
issues or even instability of the inverter control system. Active damping (AD)
is widely e... | 2404.05640v1 |
2024-04-10 | Chemical Interface Damping by Electrochemical Gold Oxidation | Chemical interface damping is a change in the effective collision frequency
of conduction band electrons in metal originating from a chemical change of the
metal interface. In this work, we present in-situ ellipsometric measurements
that reveal the chemical interface damping effect from electrochemical
oxidation of sin... | 2404.06799v1 |
1996-09-10 | The Damping Tail of CMB Anisotropies | By decomposing the damping tail of CMB anisotropies into a series of transfer
functions representing individual physical effects, we provide ingredients that
will aid in the reconstruction of the cosmological model from small-scale CMB
anisotropy data. We accurately calibrate the model-independent effects of
diffusion ... | 9609079v1 |
1997-09-16 | Lyman-alpha emission as a tool to study high redshift damped systems | We report a quantitative study of the escape of Lyman-alpha photons from an
inhomogeneous optically thick medium that mimics the structure of damped
Lyman-alpha absorbers. Modeling the optically thick disk with 3 components
(massive stars and HII regions, dust, and neutral hydrogen), we study the
resulting emission lin... | 9709150v1 |
1997-10-17 | The chemical evolution of galaxies causing damped Ly$α$ absorption | We have compiled all available data on chemical abundances in damped Lyman
alpha absorption systems for comparison with results from our combined chemical
and spectrophotometric galaxy evolution models. Preliminary results from
chemically consistent calculations are in agreement with observations of damped
Ly$\alpha$ s... | 9710193v1 |
1998-01-26 | Are Damped Lyman alpha Systems Rotating Disks ? | We report on high spectral resolution observations of five damped Lyman alpha
systems whose line velocity profiles and abundances are analyzed. By combining
these data with information from the literature, we study the kinematics of the
low and high ionization phases of damped systems and discuss the possibility
that p... | 9801243v1 |
2001-10-29 | Damping of inhomogeneities in neutralino dark matter | The lightest supersymmetric particle, most likely the neutralino, might
account for a large fraction of dark matter in the Universe. We show that the
primordial spectrum of density fluctuations in neutralino cold dark matter
(CDM) has a sharp cut-off due to two damping mechanisms: collisional damping
during the kinetic... | 0110601v1 |
2002-08-03 | Adiabatic Index of Dense Matter and Damping of Neutron Star Pulsations | The adiabatic index Gamma_1 for perturbations of dense matter is studied
under various physical conditions which can prevail in neutron star cores. The
dependence of Gamma_1 on the composition of matter (in particular, on the
presence of hyperons), on the stellar pulsation amplitude, and on the baryon
superfluidity is ... | 0208078v1 |
2003-01-07 | Damping of Neutron Star Shear Modes by Superfluid Friction | The forced motion of superfluid vortices in shear oscillations of rotating
solid neutron star matter produces damping of the mode. A simple model of the
unpinning and repinning processes is described, with numerical calculations of
the consequent energy decay times. These are of the order of 1 s or more for
typical ano... | 0301112v1 |
2005-04-25 | Radiative Effect on Particle Acceleration via Relativistic Electromagnetic Expansion | The radiation damping effect on the diamagnetic relativistic pulse
accelerator (DRPA) is studied in two-and-half dimensional Particle-in-Cell
(PIC) simulation with magnetized electron-positron plasmas. Self-consistently
solved radiation damping force converts particle energy to radiation energy.
The DRPA is still robus... | 0504561v1 |
1999-05-06 | Collective and chaotic motion in self-bound many-body systems | We investigate the interplay of collective and chaotic motion in a classical
self-bound N-body system with two-body interactions. This system displays a
hierarchy of three well separated time scales that govern the onset of chaos,
damping of collective motion and equilibration. Comparison with a mean-field
problem show... | 9905007v2 |
1997-05-12 | Damping of Oscillations in Layer-by-Layer Growth | We present a theory for the damping of layer-by-layer growth oscillations in
molecular beam epitaxy. The surface becomes rough on distances larger than a
layer coherence length which is substantially larger than the diffusion length.
The damping time can be calculated by a comparison of the competing roughening
and smo... | 9705100v1 |
1999-09-17 | Thermoelastic Damping in Micro- and Nano-Mechanical Systems | The importance of thermoelastic damping as a fundamental dissipation
mechanism for small-scale mechanical resonators is evaluated in light of recent
efforts to design high-Q micrometer- and nanometer-scale electro-mechanical
systems (MEMS and NEMS). The equations of linear thermoelasticity are used to
give a simple der... | 9909271v1 |
2000-10-01 | Super-Radiance and the Unstable Photon Oscillator | If the damping of a simple harmonic oscillator from a thermally random force
is sufficiently strong, then the oscillator may become unstable. For a photon
oscillator (radiatively damped by electric dipole moments), the instability
leads to a low temperature Hepp-Lieb-Preparata super-radiant phase transition.
The stable... | 0010013v1 |
2001-08-07 | Non-damped Acoustic Plasmon and Superconductivity in Single Wall Carbon Nanotubes | We show that non-damped acoustic plasmons exist in single wall carbon
nanotubes (SWCNT) and propose that the non-damped acoustic plasmons may mediate
electron-electron attraction and result in superconductivity in the SWCNT. The
superconducting transition temperature Tc for the SWCNT (3,3) obtained by this
mechanism ag... | 0108124v2 |
2001-10-11 | Enhanced Gilbert Damping in Thin Ferromagnetic Films | Using a scattering matrix approach, the precession of the magnetization of a
ferromagnet is shown to transfer spins into adjacent normal metal layers. This
``pumping'' of spins slows down the precession corresponding to an enhanced
Gilbert damping factor in the Landau-Lifshitz equation. The damping is
expressed in term... | 0110247v2 |
2001-12-16 | The Damping of the Bose-Condensate Oscillations in a Trap at Zero Temperature | We discuss an existence of the damping for the radial condensate oscillations
in a cylindric trap at zero temperature. The damping is a result of the
parametric resonance leading to energy transfer from the coherent condensate
oscillations to the longitudinal sound waves within a finite frequency
interval. The parametr... | 0112292v1 |
2002-02-11 | Radiation Induced Landau-Lifshitz-Gilbert Damping in Ferromagnets | The Landau-Lifshitz-Gilbert damping coefficient employed in the analysis of
spin wave ferromagnetic resonance is related to the electrical conductivity of
the sample. The changing magnetization (with time) radiates electromagnetic
fields. The electromagnetic energy is then absorbed by the sample and the
resulting heati... | 0202181v1 |
2002-06-13 | Beliaev damping of quasi-particles in a Bose-Einstein condensate | We report a measurement of the suppression of collisions of quasi-particles
with ground state atoms within a Bose-Einstein condensate at low momentum.
These collisions correspond to Beliaev damping of the excitations, in the
previously unexplored regime of the continuous quasi-particle energy spectrum.
We use a hydrody... | 0206234v1 |
2002-06-28 | Accidental suppression of Landau damping of the transverse breathing mode in elongated Bose-Einstein condensates | We study transverse radial oscillations of an elongated Bose-Einstein
condensate using finite temperature simulations, in the context of a recent
experiment at ENS. We demonstrate the existence of a mode corresponding to an
in-phase collective oscillation of both the condensate and thermal cloud.
Excitation of this mod... | 0206582v1 |
2004-04-19 | Nonlinear response of superparamagnets with finite damping: an analytical approach | The strongly damping-dependent nonlinear dynamical response of classical
superparamagnets is investigated by means of an analytical approach. Using
rigorous balance equations for the spin occupation numbers a simple approximate
expression is derived for the nonlinear susceptibility. The results are in good
agreement wi... | 0404445v1 |
2004-09-24 | Minimal field requirement in precessional magnetization switching | We investigate the minimal field strength in precessional magnetization
switching using the Landau-Lifshitz-Gilbert equation in under-critically damped
systems. It is shown that precessional switching occurs when localized
trajectories in phase space become unlocalized upon application of field
pulses. By studying the ... | 0409671v1 |
2005-03-03 | Collapse of thermal activation in moderately damped Josephson junctions | We study switching current statistics in different moderately damped
Josephson junctions: a paradoxical collapse of the thermal activation with
increasing temperature is reported and explained by interplay of two
conflicting consequences of thermal fluctuations, which can both assist in
premature escape and help in ret... | 0503067v1 |
2006-01-10 | Voltage dependence of Landau-Lifshitz-Gilbert damping of a spin in a current driven tunnel junction | We present a theory of Landau-Lifshitz-Gilbert damping $\alpha$ for a
localized spin ${\vec S}$ in the junction coupled to the conduction electrons
in both leads under an applied volatege $V$. We find the voltage dependence of
the damping term reflecting the energy dependence of the density of states. We
find the effec... | 0601185v1 |
2006-03-13 | Universal features of the defect-induced damping of lattice vibrations | It is shown that any defect gives an Ohmic contribution to the damping of any
normal mode of the crystal lattice with nonzero wavevector which does not
vanish at zero temperature. This explains the large phason damping observed at
low temperatures in incommensurate phases, and might be a key factor to
understand the li... | 0603343v2 |
2006-04-25 | Spin Precession and Avalanches | In many magnetic materials, spin dynamics at short times are dominated by
precessional motion as damping is relatively small. In the limit of no damping
and no thermal noise, we show that for a large enough initial instability, an
avalanche can transition to an ergodic phase where the state is equivalent to
one at fini... | 0604563v1 |
2007-02-11 | Non-Markovian coherence dynamics of driven spin boson model: damped quantum beat or large amplitude coherence oscillation | The dynamics of driven spin boson model is studied analytically by means of
the perturbation approach based on a unitary transformation. We gave the
analytical expression for the population difference and coherence of the two
level system. The results show that in the weak driven case, the population
difference present... | 0702268v1 |
2005-05-10 | Highly Damped Quasinormal Modes of Generic Single Horizon Black Holes | We calculate analytically the highly damped quasinormal mode spectra of
generic single-horizon black holes using the rigorous WKB techniques of
Andersson and Howls\cite{Andersson}. We thereby provide a firm foundation for
previous analysis, and point out some of their possible limitations. The
numerical coefficient in ... | 0505044v1 |
2006-05-01 | Stability and quasinormal modes of the massive scalar field around Kerr black holes | We find quasinormal spectrum of the massive scalar field in the background of
the Kerr black holes. We show that all found modes are damped under the
quasinormal modes boundary conditions when $\mu M$ is not large, thereby
implying stability of the massive scalar field. This complements the region of
stability determin... | 0605013v1 |
1993-02-09 | Damping rates for moving particles in hot QCD | Using a program of perturbative resummation I compute the damping rates for
fields at nonzero spatial momentum to leading order in weak coupling in hot
$QCD$. Sum rules for spectral densities are used to simplify the calculations.
For massless fields the damping rate has an apparent logarithmic divergence in
the infrar... | 9302242v1 |
1994-04-21 | Is \lq\lq Heavy Quark Damping Rate Puzzle'' in Hot QCD Really the Puzzle? | Within the framework of perturbative resummation scheme of Pisarski and
Braaten, the decay- or damping-rate of a moving heavy quark (muon) to leading
order in weak coupling in hot QCD (QED) is examined. Although, as is well
known, the conventionally-defined damping rate diverges logarithmically at the
infrared limit, s... | 9404318v1 |
1996-01-12 | Damping Rate of a Scalar Particle in Hot Scalar QED | In contrast to the damping of partons in a quark-gluon plasma, the damping of
a scalar particle in a hot scalar QED plasma can be calculated to leading order
for the whole momentum range using the Braaten-Pisarski method. In this way the
evolution of the logarithmic infrared singularity caused by the exchange of a
tran... | 9601254v1 |
1996-09-17 | Damping Rate of Quasiparticles in Degenerate Ultrarelativistic Plasmas | We compute the damping rate of a fermion in a dense relativistic plasma at
zero temperature. Just above the Fermi sea, the damping rate is dominated by
the exchange of soft magnetic photons (or gluons in QCD) and is proportional to
$(E-\mu)$, where E is the fermion energy and $\mu$ the chemical potential. We
also compu... | 9609369v1 |
1997-05-28 | Classical Statistical Mechanics and Landau Damping | We study the retarded response function in scalar $\phi^4$-theory at finite
temperature. We find that in the high-temperature limit the imaginary part of
the self-energy is given by the classical theory to leading order in the
coupling. In particular the plasmon damping rate is a purely classical effect
to leading orde... | 9705452v1 |
1997-12-01 | A potential infrared problem with the damping rates for gluons with soft momentum in hot QCD | We calculate the damping rate $\gamma_l$ for longitudinal gluons with zero
momentum in finite high temperature QCD and show that some of its contributing
terms are infrared divergent. This is in contrast with the expectation that
this damping rate is to be equal to the corresponding one $\gamma_t$ for
transverse gluons... | 9712210v1 |
1998-04-21 | The Plasmon Damping Rate for T -> T_C | The plasmon damping rate in scalar field theory is computed close to the
critical temperature. It is shown that the divergent result obtained in
perturbation theory is a consequence of neglecting the thermal renormalization
of the coupling. Taking this effect into account, a vanishing damping rate is
obtained, leading ... | 9804351v2 |
1998-10-06 | Self-consistent Study on Color Transport in the Quark Gluon Plasma at Finite Chemical Potential | We calculate the relaxation time self-consistently to study the damping of
collective color modes and the color conductivity in a QGP by deriving
self-consistent equations for the damping rates of gluons and quarks to leading
order QCD by TFD including a chemical potential for quarks. We show that the
damping rates are... | 9810256v1 |
1999-02-19 | The problem of nonlinear Landau damping in quark-gluon plasma | On the basis of the semiclassical equations for quark-gluon plasma (QGP) and
Yang-Mills equation, the generalized kinetic equation for waves with regard to
its interaction is obtained. The physical mechanisms defining nonlinear
scattering of a plasmon by QGP particles are analysed. The problem on a
connection of nonlin... | 9902397v2 |
1999-07-21 | A Slavnov-Taylor identity and equality of damping rates for static transverse and longitudinal gluons in hot QCD | A Slavnov-Taylor identity is derived for the gluon polarization tensor in hot
QCD. We evaluate its implications for damping of gluonic modes in the plasma.
Applying the identity to next to the leading order in hard-thermal-loop
resummed perturbation theory, we derive the expected equality of damping rates
for static tr... | 9907439v1 |
2000-09-15 | Fermion Damping Rate Effects in Cold Dense Matter | We review the non-Fermi or marginal liquid behavior of a relativistic QED
plasma. In this medium a quasiparticle has a damping rate that depends linearly
on the distance between its energy and the Fermi surface. We stress that this
dependence is due to the long-range character of the magnetic interactions in
the medium... | 0009182v1 |
2001-07-19 | Photon Damping Caused by Electron-Positron Pair Production in a Strong Magnetic Field | Damping of an electromagnetic wave in a strong magnetic field is analyzed in
the kinematic region near the threshold of electron-positron pair production.
Damping of the electromagnetic field is shown to be noticeably nonexponential
in this region. The resulting width of the photon $\gamma \to e^+ e^-$ decay is
conside... | 0107217v1 |
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