publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2018-02-20 | Ultrafast magnetization dynamics in pure and doped Heusler and inverse Heusler alloys | By using a multiscale approach based on first-principles density functional
theory combined with atomistic spin dynamics, we investigate the electronic
structure and magnetization dynamics of an inverse Heusler and a Heusler
compound and their alloys, i. e. Mn$_{2-x}Z_x$CoAl and Mn$_{2-x}Z_x$VAl, where
$Z$ = Mo, W, Os ... | 1802.07195v1 |
2019-01-24 | Reaffirmation of Cosmological Oscillations in the Scale Factor from the Pantheon Compilation of 1048 Type Ia Supernovae | We observe damped temporal oscillations in the scale factor at a dominant
frequency of ~ 7 cycles/Hubble-time in the Pantheon Compilation of 1048 type Ia
supernovae (SNe). The residual oscillations observed in the Pantheon data
closely matches and reaffirms our initial observation of oscillations from
earlier SNe data ... | 1901.10311v3 |
2019-03-14 | A new class of accelerated regularization methods, with application to bioluminescence tomography | In this paper we propose a new class of iterative regularization methods for
solving ill-posed linear operator equations. The prototype of these iterative
regularization methods is in the form of second order evolution equation with a
linear vanishing damping term, which can be viewed not only as an extension of
the as... | 1903.05972v2 |
2019-05-15 | Stop-and-Go Suppression in Two-Class Congested Traffic | This paper develops boundary feedback control laws in order to damp out
traffic oscillations in the congested regime of the linearized two-class
Aw-Rascle (AR) traffic model. The macroscopic second-order two-class AR traffic
model consists of four hyperbolic partial differential equations (PDEs)
describing the dynamics... | 1905.06476v1 |
2019-10-07 | Chiral spin-wave velocities induced by all-garnet interfacial Dzyaloshinskii-Moriya interaction in ultrathin yttrium iron garnet films | Spin waves can probe the Dzyaloshinskii-Moriya interaction (DMI) which gives
rise to topological spin textures, such as skyrmions. However, the DMI has not
yet been reported in yttrium iron garnet (YIG) with arguably the lowest damping
for spin waves. In this work, we experimentally evidence the interfacial DMI in
a 7~... | 1910.02599v2 |
2019-11-20 | Extreme events in a network of heterogeneous Josephson junctions | We report rare and recurrent large spiking events in a heterogeneous network
of superconducting Josephson junctions (JJ) connected through a resistive load
and driven by a radio-frequency (rf) current in addition to a constant bias.
The intermittent large spiking events show characteristic features of extreme
events (E... | 1911.10040v1 |
2019-12-05 | Atypical Behavior of Collective Modes in Two-Dimensional Fermi Liquids | Using the Landau kinetic equation to study the non-equilibrium behavior of
interacting Fermi systems is one of the crowning achievements of Landau's Fermi
liquid theory. While thorough study of transport modes has been done for
standard three-dimensional Fermi liquids, an equally in-depth analysis for two
dimensional F... | 1912.02699v2 |
2020-01-30 | Ability of Markovian Master Equations to Model Quantum Computers and Other Systems Under Broadband Control | Most future quantum devices, including quantum computers, require control
that is broadband, meaning that the rate of change of the time-dependent
Hamiltonian is as fast or faster than the dynamics it generates. In many areas
of quantum physics, including quantum technology, one must include dissipation
and decoherence... | 2001.11160v1 |
2020-02-06 | Effects of transition-metal spacers on the spin-orbit torques, spin Hall magnetoresistance, and magnetic anisotropy of Pt/Co bilayers | We studied the effect of inserting 0.5 nm-thick spacer layers (Ti, V, Cr, Mo,
W) at the Pt/Co interface on the spin-orbit torques, Hall effect,
magnetoresistance, saturation magnetization, and magnetic anisotropy. We find
that the damping-like spin-orbit torque decreases substantially for all samples
with a spacer laye... | 2002.02162v1 |
2020-04-30 | Unifying femtosecond and picosecond single-pulse magnetic switching in GdFeCo | Many questions are still open regarding the physical mechanisms behind the
magnetic switching in GdFeCo alloys by single optical pulses. Phenomenological
models suggest a femtosecond scale exchange relaxation between sublattice
magnetization as the driving mechanism for switching. The recent observation of
thermally in... | 2004.14844v1 |
2020-06-12 | Tidal Asteroseismology: Possible Evidence of Non-linear Mode Coupling in an Equilibrium State in Kepler Eclipsing Binary KIC 3230227 | Previously, a series of tidally-excited oscillations were discovered in the
eccentric eclipsing binary KIC 3230227. The pulsation amplitudes and phases
suggest the observed oscillations are prograde quadruple modes. In this paper,
we refine the analysis and extract more oscillation frequencies. We also study
the tempor... | 2006.07417v1 |
2021-02-22 | Anisotropic cosmological models in Horndeski gravity | It was found recently that the anisotropies in the homogeneous Bianchi I
cosmology considered within the context of a specific Horndeski theory are
damped near the initial singularity instead of being amplified. In this work we
extend the analysis of this phenomenon to cover the whole of the Horndeski
family. We find t... | 2102.10981v2 |
2021-03-18 | Size limit of superparamagnetic inclusions in dust grains and difficulty of magnetic grain alignment in protoplanetary disks | Alignment of non-spherical grains with magnetic fields is an important
problem as it lays the foundation of probing magnetic fields with polarized
dust thermal emissions. In this paper, we investigate the feasibility of
magnetic alignment in protoplanetary disks (PPDs). We use an alignment
condition that Larmor precess... | 2103.10243v1 |
2021-05-19 | Viscoelasticity and elastocapillarity effects in the impact of drops on a repellent surface | We investigate freely expanding viscoelastic sheets. The sheets are produced
by the impact of drops on a quartz plate covered with a thin layer of liquid
nitrogen that suppresses shear viscous dissipation as a result of the cold
Leidenfrost effect. The time evolution of the sheet is simultaneously recorded
from top and... | 2105.09244v1 |
2021-06-23 | The dynamical exponent of a quantum critical itinerant ferromagnet: a Monte Carlo study | We consider the effect of the coupling between 2D quantum rotors near an XY
ferromagnetic quantum critical point and spins of itinerant fermions. We
analyze how this coupling affects the dynamics of rotors and the self-energy of
fermions.A common belief is that near a $q=0$ ferromagnetic transition,
fermions induce an ... | 2106.12601v3 |
2021-08-20 | Cosmic-Ray Transport in Simulations of Star-forming Galactic Disks | Cosmic ray transport on galactic scales depends on the detailed properties of
the magnetized, multiphase interstellar medium (ISM). In this work, we
post-process a high-resolution TIGRESS magnetohydrodynamic simulation modeling
a local galactic disk patch with a two-moment fluid algorithm for cosmic ray
transport. We c... | 2108.09356v1 |
2021-09-13 | Control of magnetization dynamics by substrate orientation in YIG thin films | Yttrium Iron Garnet (YIG) and bismuth (Bi) substituted YIG (Bi0.1Y2.9Fe5O12,
BYG) films are grown in-situ on single crystalline Gadolinium Gallium Garnet
(GGG) substrates [with (100) and (111) orientations] using pulsed laser
deposition (PLD) technique. As the orientation of the Bi-YIG film changes from
(100) to (111),... | 2109.05901v1 |
2021-12-24 | Excitation of ion-acoustic waves by non-linear finite-amplitude standing Alfvén waves | We investigate, using a multi-fluid approach, the main properties of standing
ion-acoustic modes driven by nonlinear standing Alfv\'en waves. The standing
character of the Alfv\'enic pump is because we study the superposition of two
identical circularly polarised counter-propagating waves. We consider parallel
propagat... | 2112.13048v1 |
2021-12-25 | Internal modes and radiation damping for quadratic Klein-Gordon in 3D | We consider Klein-Gordon equations with an external potential $V$ and a
quadratic nonlinearity in $3+1$ space dimensions. We assume that $V$ is regular
and decaying and that the (massive) Schr\"odinger operator $H=-\Delta+V+m^2$
has a positive eigenvalue $\lambda^2<m^2$ with associated eigenfunction $\phi.$
This is a s... | 2112.13163v2 |
2022-01-17 | Sizing of Energy Storage System for Virtual Inertia Emulation | The infusion of renewable energy sources into the conventional synchronous
generation system decreases the overall system inertia and negatively impacts
the stability of its primary frequency response. The lowered inertia is due to
the absence of inertia in some of the renewable energy-based systems. To
maintain the st... | 2201.06566v2 |
2022-04-26 | Galactic seismology: joint evolution of impact-triggered stellar and gaseous disc corrugations | Evidence for wave-like corrugations are well established in the Milky Way and
in nearby disc galaxies. These were originally detected as a displacement of
the interstellar medium about the midplane, either in terms of vertical
distance or vertical velocity. Over the past decade, similar patterns have
emerged in the Mil... | 2204.12096v2 |
2022-04-28 | Low-frequency resolvent analysis of the laminar oblique shock wave / boundary layer interaction | Resolvent analysis is used to study the low-frequency behaviour of the
laminar oblique shock wave / boundary layer interaction (SWBLI). It is shown
that the computed optimal gain, which can be seen as a transfer function of the
system, follows a first-order low-pass filter equation, recovering the results
of Touber and... | 2204.13527v1 |
2022-09-01 | Growth parameters of Bi0.1Y2.9Fe5O12 thin films for high frequency applications | The growth and characterization of Bismuth (Bi) substituted YIG (Bi-YIG,
Bi0.1Y2.9Fe5O12) thin films are reported. Pulsed laser deposited (PLD) films
with thicknesses ranging from 20 to 150 nm were grown on Gadolinium Gallium
Garnet substrates. Two substrate orientations of (100) and (111) were
considered. The enhanced... | 2209.00558v1 |
2022-09-02 | Identical damped harmonic oscillators described by coherent states | Some aspects of quantum damped harmonic oscillator (DHO) obeying a Markovian
master equation are considered in the absence of thermal noise. The continuity
equation is derived and Bohmian trajectories are constructed. As a solution of
the master equation, we take a single coherent state and compute analytically
the rel... | 2209.00914v2 |
2022-11-27 | Dynamic surface tension of the pure liquid-vapor interface subjected to the cyclic loads | We demonstrate a methodology for computationally investigating the mechanical
response of a pure molten lead surface system to the lateral mechanical cyclic
loads and try to answer the question: how dose the dynamically driven liquid
surface system follow the classical physics of the elastic-driven oscillation?
The ste... | 2211.14766v1 |
2023-11-07 | Strong electron-phonon coupling in Ba$_{1-x}$Sr$_x$Ni$_2$As$_2$ | The charge density wave (CDW) or nematicity has been found to coexist with
superconductivity in many systems. It is thus interesting that the
superconducting transition temperature $T_c$ in the doped BaNi$_2$As$_2$ system
can be enhanced up to six times as the CDW or nematicity in the undoped
compound is suppressed. He... | 2311.03649v2 |
2023-11-21 | Numerical modelling of bulk viscosity in neutron stars | The early post-merger phase of a binary neutron-star coalescence is shaped by
characteristic rotational velocities as well as violent density oscillations
and offers the possibility to constrain the properties of neutron star matter
by observing the gravitational wave emission. One possibility to do so is the
investiga... | 2311.13027v1 |
2023-12-24 | Transient growth of wavelet-based resolvent modes in the buffer layer of wall-bounded turbulence | In this work, we study the transient growth of the principal resolvent modes
in the minimal flow unit using a reformulation of resolvent analysis in a
time-localized wavelet basis. We target the most energetic spatial wavenumbers
for the minimal flow unit and obtain modes that are constant in the streamwise
direction a... | 2312.15465v1 |
2024-02-27 | Fourier analysis of near-field patterns generated by propagating polaritons | Scattering-type scanning near-field optical microscope (s-SNOM) has become an
essential tool to study polaritons - quasiparticles of light coupled to
collective charge oscillations - via direct probing of their near field with a
spatial resolution far beyond the diffraction limit. However, extraction of the
polariton c... | 2402.17225v2 |
2000-09-11 | Numerical Studies on Locally Damped Structures | In the JLC/NLC X-band linear collider, it is essential to reduce the
long-range dipole wakefields in the accelerator structure to prevent beam break
up (BBU) and emittance degradation. The two methods of reducing the long-range
wakefields are detuning and damping. Detuning reduces the wakefields rapidly as
the dipole m... | 0009039v1 |
2015-03-13 | A one-step optimal energy decay formula for indirectly nonlinearly damped hyperbolic systems coupled by velocities | In this paper, we consider the energy decay of a damped hyperbolic system of
wave-wave type which is coupled through the velocities. We are interested in
the asymptotic properties of the solutions of this system in the case of
indirect nonlinear damping, i.e. when only one equation is directly damped by a
nonlinear dam... | 1503.04126v1 |
2015-08-21 | Radiative damping in wave guide based FMR measured via analysis of perpendicular standing spin waves in sputtered Permalloy films | The damping $\alpha$ of the spinwave resonances in 75 nm, 120 nm, and 200nm
-thick Permalloy films is measured via vector-network-analyzer
ferromagnetic-resonance (VNA-FMR) in the out-of-plane geometry. Inductive
coupling between the sample and the waveguide leads to an additional radiative
damping term. The radiative ... | 1508.05265v1 |
2016-02-23 | Experimental Investigation of Temperature-Dependent Gilbert Damping in Permalloy Thin Films | The Gilbert damping of ferromagnetic materials is arguably the most important
but least understood phenomenological parameter that dictates real-time
magnetization dynamics. Understanding the physical origin of the Gilbert
damping is highly relevant to developing future fast switching spintronics
devices such as magnet... | 1602.07325v1 |
2017-09-29 | Non-local Gilbert damping tensor within the torque-torque correlation model | An essential property of magnetic devices is the relaxation rate in magnetic
switching which depends strongly on the damping in the magnetisation dynamics.
It was recently measured that damping depends on the magnetic texture and,
consequently, is a non-local quantity. The damping enters the
Landau-Lifshitz-Gilbert equ... | 1709.10365v1 |
2022-09-28 | Tunable nonlinear damping in parametric regime | Nonlinear damping plays a significant role in several area of physics and it
is becoming increasingly important to understand its underlying mechanism.
However, microscopic origin of nonlinear damping is still a debatable topic.
Here, we probe and report nonlinear damping in a highly tunable MoS2 nano
mechanical drum r... | 2209.14120v1 |
2005-11-07 | The Effects of Alfven Waves and Radiation Pressure in Dusty Winds of Late-Type Stars. II. Dust-Cyclotron Damping | There are in the literature several theories to explain the mass loss in
stellar winds. In particular, for late-type stars, some authors have proposed a
wind model driven by an outward-directed flux of damped Alfven waves. The winds
of these stars present great amounts of dust particles that, if charged, can
give rise ... | 0511192v2 |
2013-09-11 | Initial versus tangent stiffness-based Rayleigh damping in inelastic time history seismic analyses | In the inelastic time history analyses of structures in seismic motion, part
of the seismic energy that is imparted to the structure is absorbed by the
inelastic structural model, and Rayleigh damping is commonly used in practice
as an additional energy dissipation source. It has been acknowledged that
Rayleigh damping... | 1309.2741v1 |
2017-07-14 | Damping of gravitational waves by matter | We develop a unified description, via the Boltzmann equation, of damping of
gravitational waves by matter, incorporating collisions. We identify two
physically distinct damping mechanisms -- collisional and Landau damping. We
first consider damping in flat spacetime, and then generalize the results to
allow for cosmolo... | 1707.05192v2 |
2001-08-28 | Galaxy number counts in the Hubble Deep Field as a strong constraint on a hierarchical galaxy formation model | Number counts of galaxies are re-analyzed using a semi-analytic model (SAM)
of galaxy formation based on the hierarchical clustering scenario. We have
determined the astrophysical parameters in the SAM that reproduce observations
of nearby galaxies, and used them to predict the number counts and redshifts of
faint gala... | 0108433v1 |
2010-05-07 | Quantum phase transitions of metals in two spatial dimensions: II. Spin density wave order | We present a field-theoretic renormalization group analysis of Abanov and
Chubukov's model of the spin density wave transition in two dimensional metals.
We identify the independent field scale and coupling constant renormalizations
in a local field theory, and argue that the damping constant of spin density
wave fluct... | 1005.1288v2 |
2017-08-03 | Evolution of the interfacial perpendicular magnetic anisotropy constant of the Co$_2$FeAl/MgO interface upon annealing | We investigate thickness series of films of the Heusler alloy Co$_2$FeAl in
order to study the effect of annealing on the interface with a MgO layer and on
the bulk magnetic properties. Our results reveal that while the perpendicular
interface anisotropy constant $K^{\perp}_{\rm S}$ is zero for the as-deposited
samples... | 1708.01126v2 |
2023-09-10 | Scalar fields around a loop quantum gravity black hole in de Sitter spacetime: Quasinormal modes, late-time tails and strong cosmic censorship | Loop quantum gravity, as one branch of quantum gravity, holds the potential
to explore the fundamental nature of black holes. Recently, according to the
quantum Oppenheimer-Snyder model in loop quantum cosmology, a novel loop
quantum corrected black hole in de Sitter spacetime has been discovered. Here,
we first invest... | 2309.04962v2 |
2006-05-22 | The entanglement of damped noon-state and its performance in phase measurement | The state evolution of the initial optical \textit{noon} state is
investigated. The residue entanglement of the state is calculated after it is
damped by amplitude and phase damping. The relative entropy of entanglement of
the damped state is exactly obtained. The performance of direct application of
the damped \textit... | 0605184v1 |
2007-10-04 | Channel-Adapted Quantum Error Correction for the Amplitude Damping Channel | We consider error correction procedures designed specifically for the
amplitude damping channel. We analyze amplitude damping errors in the
stabilizer formalism. This analysis allows a generalization of the [4,1]
`approximate' amplitude damping code of quant-ph/9704002. We present this
generalization as a class of [2(M... | 0710.1052v1 |
2011-11-30 | Local phase damping of single qubits sets an upper bound on the phase damping rate of entangled states | I derive an inequality in which the phase damping rates of single qubits set
an upper bound for the phase damping rate of entangled states of many qubits.
The derivation is based on two assumptions: first, that the phase damping can
be described by a dissipator in Lindblad form and, second, that the phase
damping prese... | 1111.7152v2 |
2012-05-11 | Quantum dynamics of the damped harmonic oscillator | The quantum theory of the damped harmonic oscillator has been a subject of
continual investigation since the 1930s. The obstacle to quantization created
by the dissipation of energy is usually dealt with by including a discrete set
of additional harmonic oscillators as a reservoir. But a discrete reservoir
cannot direc... | 1205.2545v1 |
2014-02-28 | Escape rate for the power-law distribution in low-to-intermediate damping | Escape rate in the low-to-intermediate damping connecting the low damping
with the intermediate damping is established for the power-law distribution on
the basis of flux over population theory. We extend the escape rate in the low
damping to the low-to-intermediate damping, and get an expression for the
power-law dist... | 1402.7194v2 |
2015-03-21 | On damping created by heterogeneous yielding in the numerical analysis of nonlinear reinforced concrete frame elements | In the dynamic analysis of structural engineering systems, it is common
practice to introduce damping models to reproduce experimentally observed
features. These models, for instance Rayleigh damping, account for the damping
sources in the system altogether and often lack physical basis. We report on an
alternative pat... | 1503.07122v1 |
2016-01-20 | Introduction to Landau Damping | The mechanism of Landau damping is observed in various systems from plasma
oscillations to accelerators. Despite its widespread use, some confusion has
been created, partly because of the different mechanisms producing the damping
but also due to the mathematical subtleties treating the effects. In this
article the ori... | 1601.05227v1 |
2018-07-25 | Regularity and asymptotic behaviour for a damped plate-membrane transmission problem | We consider a transmission problem where a structurally damped plate equation
is coupled with a damped or undamped wave equation by transmission conditions.
We show that exponential stability holds in the damped-damped situation and
polynomial stability (but no exponential stability) holds in the
damped-undamped case. ... | 1807.09730v1 |
2021-08-04 | Nonlinear fluid damping of elastically mounted pitching wings in quiescent water | We experimentally study the nonlinear fluid damping of a rigid but
elastically mounted pitching wing in the absence of a freestream flow. The
dynamics of the elastic mount are simulated using a cyber-physical system. We
perturb the wing and measure the fluid damping coefficient from damped
oscillations over a large ran... | 2108.02090v1 |
2019-06-18 | Phase dynamics of effective drag and lift in vortex-induced vibration at low mass-damping | In this work, we investigate the dynamics of vortex-induced vibration of an
elastically mounted cylinder with very low values of mass and damping. We use
two methods to investigate this canonical problem: first we calculate the
instantaneous phase between the cylinder motion and the fluid forcing; second
we decompose t... | 1906.07375v2 |
2002-11-03 | Damping of coupled phonon--plasmon modes | The effect of free carriers on dispersion and damping of coupled
phonon-plasmon modes is considered in the long-wave approximation. The electron
and phonon scattering rate as well as Landau damping are taken into account. | 0211040v1 |
2002-02-01 | On "the authentic damping mechanism" of the phonon damping model | Some general features of the phonon damping model are presented. It is
concluded that the fits performed within this model have no physical content. | 0202006v1 |
2010-12-20 | Global attractors for the one dimensional wave equation with displacement dependent damping | We study the long-time behavior of solutions of the one dimensional wave
equation with nonlinear damping coefficient. We prove that if the damping
coefficient function is strictly positive near the origin then this equation
possesses a global attractor. | 1012.4455v1 |
2018-01-28 | Observations of excitation and damping of transversal oscillation in coronal loops by AIA/SDO | The excitation and damping of transversal coronal loop oscillations and
quantitative relation between damping time, damping quality (damping time per
period), oscillation amplitude, dissipation mechanism and the wake phenomena
are investigated. The observed time series data with the \textit{Atmospheric
Imaging Assembly... | 1801.09217v1 |
1999-11-16 | Probing supernovae ejecta by Halpha damping wings | It is predicted that H$\alpha$ emission line at the early nebular epoch of
type II-P supernovae may display robust observational effects of damping wings.
This is illustrated by Monte-Carlo simulations. The strength of damping wing
effects may be used to constrain parameters of the line-emitting zone. An
anomalous reds... | 9911300v1 |
2009-01-23 | Rheological Interpretation of Rayleigh Damping | Damping is defined through various terms such as energy loss per cycle (for
cyclic tests), logarithmic decrement (for vibration tests), complex modulus,
rise-time or spectrum ratio (for wave propagation analysis), etc. For numerical
modeling purposes, another type of damping is frequently used : it is called
Rayleigh d... | 0901.3717v1 |
2015-05-06 | Remarks on the asymptotic behavior of the solution of an abstract damped wave equation | We study an abstract damped wave equation. We prove that the solution of the
damped wave equation becomes closer to the solution of a heat type equation as
time tend to infinity. As an application of our approach, we also study the
asymptotic behavior of the damped wave equation in Euclidean space under the
geometric c... | 1505.01794v2 |
2017-01-18 | Two types of spurious damping forces potentially modeled in numerical seismic nonlinear response history analysis | The purpose of this paper is to provide practitioners with further insight
into spurious damping forces that can be generated in nonlinear seismic
response history analyses (RHA). The term 'spurious' is used to refer to
damping forces that are not present in an elastic system and appear as
nonlinearities develop: such ... | 1701.05092v1 |
2017-02-02 | Exponential stability for a coupled system of damped-undamped plate equations | We consider the transmission problem for a coupled system of undamped and
structurally damped plate equations in two sufficiently smooth and bounded
subdomains. It is shown that, independently of the size of the damped part, the
damping is strong enough to produce uniform exponential decay of the energy of
the coupled ... | 1702.00637v1 |
2017-09-11 | Comparison of damping mechanisms for transverse waves in solar coronal loops | We present a method to assess the plausibility of alternative mechanisms to
explain the damping of magnetohydrodynamic (MHD) transverse waves in solar
coronal loops. The considered mechanisms are resonant absorption of kink waves
in the Alfv\'en continuum, phase-mixing of Alfv\'en waves, and wave leakage.
Our methods m... | 1709.03347v1 |
2019-03-25 | Distributed Inter-Area Oscillation Damping Control for Power Systems by Using Wind Generators and Load Aggregators | This paper investigates the potential of wind turbine generators (WTGs) and
load aggregators (LAs) to provide supplementary damping control services for
low frequency inter-area oscillations (LFOs) through the additional distributed
damping control units (DCUs) proposed in their controllers. In order to provide
a scala... | 1903.10135v1 |
2019-08-19 | Spectral determinant for the damped wave equation on an interval | We evaluate the spectral determinant for the damped wave equation on an
interval of length $T$ with Dirichlet boundary conditions, proving that it does
not depend on the damping. This is achieved by analysing the square of the
damped wave operator using the general result by Burghelea, Friedlander, and
Kappeler on the ... | 1908.06862v1 |
2020-10-12 | Decays rates for Kelvin-Voigt damped wave equations II: the geometric control condition | We study in this article decay rates for Kelvin-Voigt damped wave equations
under a geometric control condition. We prove that when the damping coefficient
is sufficiently smooth ($C^1$ vanishing nicely) we show that exponential decay
follows from geometric control conditions (see~\cite{BuCh, Te12} for similar
results ... | 2010.05614v2 |
2020-12-05 | On Periodical Damping Ratio of a Controlled Dynamical System with Parametric Resonances | This report provides an interpretation on the periodically varying damping
ratio of a dynamical system with direct control of oscillation or vibration
damping. The principal parametric resonance of the system and a new type of
parametric resonance, named "zero-th order" parametric resonance, are
investigated by using t... | 2012.02932v1 |
2021-06-09 | Grammage of cosmic rays in the proximity of supernova remnants embedded in a partially ionized medium | We investigate the damping of Alfv\'en waves generated by the cosmic ray
resonant streaming instability in the context of the cosmic ray escape and
propagation in the proximity of supernova remnants. We consider ion-neutral
damping, turbulent damping and non linear Landau damping in the warm ionized
and warm neutral ph... | 2106.04948v1 |
2021-06-22 | Sharp decay rate for the damped wave equation with convex-shaped damping | We revisit the damped wave equation on two-dimensional torus where the damped
region does not satisfy the geometric control condition. We show that if the
damping vanishes as a H\"older function $|x|^{\beta}$, and in addition, the
boundary of the damped region is strictly convex, the wave is stable at rate
$t^{-1+\frac... | 2106.11782v3 |
2021-08-09 | Effect of stepwise adjustment of Damping factor upon PageRank | The effect of adjusting damping factor {\alpha}, from a small initial value
{\alpha}0 to the final desired {\alpha}f value, upon then iterations needed for
PageRank computation is observed. Adjustment of the damping factor is done in
one or more steps. Results show no improvement in performance over a fixed
damping fac... | 2108.04150v1 |
2021-08-17 | Asymptotic behaviour of the wave equation with nonlocal weak damping, anti-damping and critical nonlinearity | In this paper we prove the existence of the global attractor for the wave
equation with nonlocal weak damping, nonlocal anti-damping and critical
nonlinearity. | 2108.07395v2 |
2023-02-23 | Buckling Metamaterials for Extreme Vibration Damping | Damping mechanical resonances is a formidable challenge in an increasing
number of applications. Many of the passive damping methods rely on using low
stiffness dissipative elements, complex mechanical structures or electrical
systems, while active vibration damping systems typically add an additional
layer of complexi... | 2302.11968v1 |
2005-08-26 | Damping of MHD turbulence in Solar Flares | (Abridged) We describe the cascade of plasma waves or turbulence injected,
presumably by reconnection, at scales comparable to the size of a solar flare
loop to scales comparable to particle gyroradii, and evaluate their damping by
various mechanisms. We show that the classical viscous damping is unimportant
for magnet... | 0508567v1 |
2011-07-27 | Constraint damping for the Z4c formulation of general relativity | One possibility for avoiding constraint violation in numerical relativity
simulations adopting free-evolution schemes is to modify the continuum
evolution equations so that constraint violations are damped away. Gundlach et.
al. demonstrated that such a scheme damps low amplitude, high frequency
constraint violating mo... | 1107.5539v2 |
2023-12-14 | Nonlocal damping of spin waves in a magnetic insulator induced by normal, heavy, or altermagnetic metallic overlayer: a Schwinger-Keldysh field theory approach | Understanding spin wave (SW) damping, and how to control it to the point of
being able to amplify SW-mediated signals, is one of the key requirements to
bring the envisaged magnonic technologies to fruition. Even widely used
magnetic insulators with low magnetization damping in their bulk, such as
yttrium iron garnet, ... | 2312.09140v1 |
1994-01-10 | Radio Emitting Dust in the Free-Electron Layer of Spiral Galaxies: Testing the Disk/Halo Interface | We present a study of the radio emission from rotating, charged dust grains
immersed in the ionized gas constituting the thick, H$\alpha$-emitting disk of
many spiral galaxies. Using up-to-date optical constants, the charge on the
grains exposed to the diffuse galactic UV flux has been calculated. An
analytical approxi... | 9401010v1 |
1994-11-01 | Toward Understanding CMB Anisotropies and Their Implications | Working toward a model independent understanding of cosmic microwave
background (CMB) anisotropies and their significance, we undertake a
comprehensive and self-contained study of scalar perturbation theory. Initial
conditions, evolution, thermal history, matter content, background dynamics,
and geometry all play a rol... | 9411008v1 |
1995-02-20 | Constraints on Self-Interacting Dark Matter | We consider the growth of density perturbations in the presence of
self--interacting dark matter, SIDM, proposed by Carlson, Machacek and Hall
(1992). We determine the range of values for the coupling constant $\lambda$
and the particle mass $m^\prime$, for which the power spectrum lies in the
``allowed" range based on... | 9502087v1 |
1996-12-16 | Favored Variants of Cold Dark Matter Cosmologies | We discuss variants of Cold Dark Matter (CDM) dominated cosmological models
that give good agreement with a range of observations. We consider models with
hot dark matter, tilt, $\Omega < 1$, or a cosmological constant. We also
discuss the sensitivity of the results to other parameters, such as the Hubble
parameter and... | 9612156v1 |
1997-08-07 | Gravitational Magnification of the Cosmic Microwave Background | Some aspects of gravitational lensing by large scale structure (LSS) are
investigated. We show that lensing causes the damping tail of the cosmic
microwave background (CMB) power spectrum to fall less rapidly with decreasing
angular scale than previously expected. This is due to a transfer of power from
larger to small... | 9708059v1 |
1997-09-09 | Thermochemical Instabilities in Optically Thin Reacting Plasmas | The linear stability analysis of an optically thin plasma where a general
reaction proceeds, including chemical relaxation time effects, is carried out .
A fifth order dispersion equation (instead of the fourth order one resulting
when such effects are neglected) is obtained. The new mode with the
corresponding instabi... | 9709079v1 |
1998-11-10 | Temperature Anisotropies and Distortions Induced by Hot Intracluster Gas on the Cosmic Microwave Background | The power spectrum of temperature anisotropies induced by hot intracluster
gas on the cosmic background radiation is calculated. For low multipoles it
remains constant while at multipoles above $l>2000$ it is exponentially damped.
The shape of the radiation power spectrum is almost independent of the average
intraclust... | 9811158v1 |
2001-12-13 | Do the Fundamental Constants Vary in the Course of the Cosmological Evolution? | We estimate the cosmological variation of the proton-to-electron mass ratio
\mu=m_p/m_e by measuring the wavelengths of molecular hydrogen transitions in
the early universe. The analysis is performed using high spectral resolution
observations (FWHM ~ 7 km/s) of two damped Lyman-\alpha systems at
z_{abs}=2.3377 and 3.0... | 0112323v2 |
2002-10-20 | Non-Axisymmetric g-Mode and p-Mode Instability in a Hydrodynamic Thin Accretion Disk | It has been suggested that quasi-periodic oscillations of accreting X-ray
sources may relate to the modes named in the title. We consider
non-axisymmetric linear perturbations to an isentropic, isothermal,
unmagnetized thin accretion disk. The radial wave equation, in which the number
of vertical nodes (n) appears as a... | 0210455v3 |
2003-10-23 | Atomic and Molecular Absorption at High Redshift | Strong constraints on possible variations in fundamental constants can be
derived from HI 21-cm and molecular rotational absorption lines observed
towards quasars. With the aim of forming a statistical sample of constraints we
have begun a program of systematic searches for such absorption systems. Here
we describe mol... | 0310672v2 |
2004-06-01 | Constraints on Resonant Particle Production during Inflation from the Matter and CMB Power Spectra | We analyze the limits on resonant particle production during inflation based
upon the power spectrum of fluctuations in matter and the cosmic microwave
background. We show that such a model is consistent with features observed in
the matter power spectrum deduced from galaxy surveys and damped Lyman-alpha
systems at hi... | 0406046v2 |
2005-11-28 | Most precise single redshift bound to Delta alpha/alpha | Verification of theoretical predictions of an oscillating behavior of the
fine-structure constant alpha with cosmic time requires high precision Delta
alpha/alpha measurements at individual redshifts, while in earlier studies the
mean Delta alpha/alpha values averaged over wide redshift intervals were
usually reported.... | 0511765v1 |
2006-06-08 | Cosmological bounds on dark matter-neutrino interactions | We investigate the cosmological effects of a neutrino interaction with cold
dark matter. We postulate a neutrino that interacts with a ``neutrino
interacting dark matter'' (NIDM) particle with an elastic-scattering cross
section that either decreases with temperature as $T^2$ or remains constant
with temperature. The n... | 0606190v1 |
2006-07-26 | Matter density perturbations in interacting quintessence models | Models with dark energy decaying into dark matter have been proposed to solve
the coincidence problem in cosmology. We study the effect of such coupling in
the matter power spectrum. Due to the interaction, the growth of matter density
perturbations during the radiation dominated regime is slower compared to
non-intera... | 0607604v1 |
2006-11-27 | High-Precision Measurements of Delta alpha/alpha from QSO Absorption Spectra | Precise radial velocity measurements (delta v/c ~ 10^{-7}) of FeII lines in
damped Ly-alpha systems from very high quality VLT/UVES spectra of quasars
HE0515-4414 and Q1101-264 are used to probe cosmological time dependence of the
fine structure constant, alpha. It is found that between two redshifts z1 =
1.15 and z2 =... | 0611803v1 |
2007-01-24 | The N/O evolution on galaxies:the role played by the star formation history | We study the evolution of nitrogen resulting from a set of spiral and
irregular galaxy models computed for a large number of input mass radial
distributions and with various star formation efficiencies. We show that our
models produce a nitrogen abundance evolution in good agreement with the
observational data. In part... | 0701691v1 |
1994-07-22 | X-Ray Scattering Measurements of the Transient Structure of a Driven Charge-Density-Wave | We report time-resolved x-ray scattering measurements of the transient
structural response of the sliding {\bf Q}$_{1}$ charge-density-wave (CDW) in
NbSe$_{3}$ to a reversal of the driving electric field. The observed time scale
characterizing this response at 70K varies from $\sim$ 15 msec for driving
fields near thre... | 9407094v1 |
1995-07-03 | Fundamental steps of group velocity for slow surface polariton under the quantum hall effect conditions | A new type of collective electromagnetic excitations, namely surface
polaritons (SP) --- in a 2D electronic layer in a high magnetic field under
Quantum Hall Effect (QHE) conditions is predicted. We have found the spectrum,
damping, and polarization of the SP in a wide range of frequencies $\omega$ and
wavevectors $\bf... | 9507001v1 |
1995-08-18 | On the normal phase of 2D Fermi liquid with weak attraction between particles | Proceeding from the simplest field theoretical model of 2D metal, the normal
phase Green functions of the weakly interacting fermions and the order
parameter fluctuations (responsible for the attraction between fermions) are
obtained. It is shown that taking into consideration the fluctuations mentioned
leads to a cons... | 9508076v1 |
1997-12-19 | Spatiotemporal dynamics of discrete sine-Gordon lattices with sinusoidal couplings | The spatiotemporal dynamics of a damped sine-Gordon chain with sinusoidal
nearest-neighbor couplings driven by a constant uniform force are discussed.
The velocity characteristics of the chain versus the external force is shown.
Dynamics in the high- and low-velocity regimes are investigated. It is found
that in the hi... | 9712226v1 |
1998-11-06 | Intermediate temperature dynamics of one-dimensional Heisenberg antiferromagnets | We present a general theory for the intermediate temperature (T) properties
of Heisenberg antiferromagnets of spin-S ions on p-leg ladders, valid for 2Sp
even or odd. Following an earlier proposal for 2Sp even (Damle and Sachdev,
cond-mat/9711014), we argue that an integrable, classical, continuum model of a
fixed-leng... | 9811083v2 |
1999-02-25 | Mobility of Bloch Walls via the Collective Coordinate Method | We have studied the problem of the dissipative motion of Bloch walls
considering a totally anisotropic one dimensional spin chain in the presence of
a magnetic field. Using the so-called "collective coordinate method" we
construct an effective Hamiltonian for the Bloch wall coupled to the magnetic
excitations of the sy... | 9902330v1 |
1999-04-06 | Non-Fermi-liquid behavior in the Kondo lattices induced by peculiarities of magnetic ordering and spin dynamics | A scaling consideration of the Kondo lattices is performed with account of
singularities in the spin excitation spectral function. It is shown that a
non-Fermi-liquid (NFL) behavior between two critical values of the bare $s-f$
coupling constant occurs naturally for complicated magnetic structures with
several magnon b... | 9904072v3 |
1999-11-23 | Collisionless dynamics of dilute Bose gases: Role of quantum and thermal fluctuations | We study the low-energy collective oscillations of a dilute Bose gas at
finite temperature in the collisionless regime. By using a time-dependent
mean-field scheme we derive for the dynamics of the condensate and
noncondensate components a set of coupled equations, which we solve
perturbatively to second order in the i... | 9911377v1 |
2000-04-07 | Coherent Atomic Oscillations and Resonances between Coupled Bose-Einstein Condensates with Time-Dependent Trapping Potential | We study the quantum coherent-tunneling between two Bose-Einstein condensates
separated through an oscillating trap potential. The cases of slowly and
rapidly varying in time trap potential are considered. In the case of a slowly
varying trap we study the nonlinear resonances and chaos in the oscillations of
the relati... | 0004117v1 |
2000-05-02 | Gravity-driven Dense Granular Flows | We report and analyze the results of numerical studies of dense granular
flows in two and three dimensions, using both linear damped springs and
Hertzian force laws between particles. Chute flow generically produces a
constant density profile that satisfies scaling relations suggestive of a
Bagnold grain inertia regime... | 0005051v1 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.