publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2018-04-15 | Reevaluation of radiation reaction and consequences for light-matter interactions at the nanoscale | In the context of electromagnetism and nonlinear optical interactions damping
is generally introduced as a phenomenological, viscous term that dissipates
energy, proportional to the temporal derivative of the polarization. Here, we
follow the radiation reaction method presented in [G. W. Ford and R. F.
O'Connell, Phys.... | 1804.05369v1 |
2018-04-30 | Wave-like blow-up for semilinear wave equations with scattering damping and negative mass term | In this paper we establish blow-up results and lifespan estimates for
semilinear wave equations with scattering damping and negative mass term for
subcritical power, which is the same as that of the corresponding problem
without mass term, and also the same as that of the corresponding problem
without both damping and ... | 1804.11073v3 |
2018-05-22 | Uniqueness of the Cauchy datum for the tempered-in-time response and conductivity operator of a plasma | We study the linear Vlasov equation with a given electric field $E \in
\mathcal{S}$, where $\mathcal{S}$ is the space of Schwartz functions. The
associated damped partial differential equation has a unique tempered solution,
which fixes the needed Cauchy datum. This tempered solution then converges to
the causal soluti... | 1805.08733v3 |
2018-05-26 | Stabilization for the wave equation with singular Kelvin-Voigt damping | We consider the wave equation with Kelvin-Voigt damping in a bounded domain.
The exponential stability result proposed by Liu and Rao or T\'ebou for that
system assumes that the damping is localized in a neighborhood of the whole or
a part of the boundary under some consideration. In this paper we propose to
deal with ... | 1805.10430v1 |
2018-06-01 | Fluctuation-damping of isolated, oscillating Bose-Einstein condensates | Experiments on the nonequilibrium dynamics of an isolated Bose-Einstein
condensate (BEC) in a magnetic double-well trap exhibit a puzzling divergence:
While some show dissipation-free Josephson oscillations, others find strong
damping. Such damping in isolated BECs cannot be understood on the level of the
coherent Gros... | 1806.00376v2 |
2018-06-05 | Decoherence assisted spin squeezing generation in superposition of tripartite GHZ and W states | In the present paper, we study spin squeezing under decoherence in the
superposition of tripartite maximally entangled GHZ and W states. Here we use
amplitude damping, phase damping and depolarisation channel. We have
investigated the dynamics of spin squeezing with the interplay of superposition
and decoherence parame... | 1806.01730v1 |
2018-07-31 | Dark Matter Particle Explorer observations of high-energy cosmic ray electrons plus positrons and their physical implications | The DArk Matter Particle Explorer (DAMPE) is a satellite-borne, high-energy
particle and $\gamma$-ray detector, which is dedicated to indirectly detecting
particle dark matter and studying high-energy astrophysics. The first results
about precise measurement of the cosmic ray electron plus positron spectrum
between 25 ... | 1807.11638v1 |
2018-08-08 | A Hybrid Dynamic-regenerative Damping Scheme for Energy Regeneration in Variable Impedance Actuators | Increasing research efforts have been made to improve the energy efficiency
of variable impedance actuators (VIAs) through reduction of energy consumption.
However, the harvesting of dissipated energy in such systems remains
underexplored. This study proposes a novel variable damping module design
enabling energy regen... | 1808.03143v1 |
2018-08-15 | $L^1$ estimates for oscillating integrals and their applications to semi-linear models with $σ$-evolution like structural damping | The present paper is a continuation of our recent paper \cite{DaoReissig}. We
will consider the following Cauchy problems for semi-linear structurally damped
$\sigma$-evolution models: \begin{equation*} u_{tt}+ (-\Delta)^\sigma u+ \mu
(-\Delta)^\delta u_t = f(u,u_t),\, u(0,x)= u_0(x),\, u_t(0,x)=u_1(x)
\end{equation*} ... | 1808.05484v2 |
2018-09-04 | Separation of the two-magnon scattering contribution to damping for the determination of the spin mixing conductance | We present angle dependent measurements of the damping properties of
epitaxial Fe layers with MgO, Al and Pt capping layers. Based on the
preferential distribution of lattice defects following the crystal symmetry, we
make use of a model of the defect density to separate the contribution of
two-magnon scattering to the... | 1809.01042v1 |
2018-09-30 | Critical behavior of the damping rate of GHz acoustic phonons in SrTiO3 at the antiferrodistortive phase transition measured by time- and frequency-resolved Brillouin scattering | We determine the temperature dependent damping rate of longitudinal acoustic
phonons in SrTiO3 using frequency domain Brillouin scattering and time domain
Brillouin scattering. We investigate samples with (La,Sr)MnO3 and SrRuO3
capping layers, which result in compressive or tensile strain at the layer -
substrate inter... | 1810.00381v1 |
2018-12-04 | Atmospheric oscillations provide simultaneous measurement of neutron star mass and radius | Neutron stars with near-Eddington observable luminosities were shown to
harbor levitating atmospheres, suspended above their surface. We report a new
method to simultaneously measure the mass and radius of a neutron star based on
oscillations of such atmospheres. In this paper, we present an analytic
derivation of a fa... | 1812.01299v2 |
2018-12-04 | Spin transport in a magnetic insulator with zero effective damping | Applications based on spin currents strongly profit from the control and
reduction of their effective damping and their transport properties. We here
experimentally observe magnon mediated transport of spin (angular) momentum
through a 13.4 nm thin yttrium iron garnet film with full control of the
magnetic damping via ... | 1812.01334v3 |
2019-01-10 | Data-Driven Online Optimization for Enhancing Power System Oscillation Damping | This paper reports an initial work on power system oscillation damping
improvement using a data-driven online optimization method. An online
oscillation damping optimization mod-el is proposed and formulated in a form
solvable by the data-driven method. Key issues in the online optimization
procedures, including the da... | 1901.03167v2 |
2019-01-13 | Nonexistence of global solutions for a weakly coupled system of semilinear damped wave equations in the scattering case with mixed nonlinear terms | In this paper we consider the blow-up of solutions to a weakly coupled system
of semilinear damped wave equations in the scattering case with nonlinearities
of mixed type, namely, in one equation a power nonlinearity and in the other a
semilinear term of derivative type. The proof of the blow-up results is based
on an ... | 1901.04038v1 |
2019-01-15 | Continuum damping effects in nuclear collisions associated with twisted boundary conditions | The time-dependent Skyrme Hartree-Fock calculations have been performed to
study $^{24}$Mg +$^{24}$Mg collisions. The twisted boundary conditions, which
can avoid finite box-size effects of the employed 3D coordinate space, have
been implemented. The prolate deformed $^{24}$Mg has been set to different
orientations to ... | 1901.04736v2 |
2019-03-03 | Spin wave damping in periodic and quasiperiodic magnonic structures | We investigated the lifetime of spin wave eigenmodes in periodic and
quasiperiodic sequences of Py and Co wires. Those materials differ
significantly in damping coefficients, therefore, the spatial distribution of
the mode amplitude within the structure is important for the lifetime of
collective spin wave excitations.... | 1903.00856v1 |
2019-03-07 | Investigating optically-excited THz standing spin waves using noncollinear magnetic bilayers | We investigate optically excited THz standing spin waves in noncollinear
magnetic bilayers. Using femtosecond laser-pulse excitation, a spin current is
generated in the first ferromagnetic (FM) layer, and flows through a conductive
spacer layer to be injected into the second (transverse) FM layer, where it
exerts a spi... | 1903.02802v1 |
2019-03-14 | An analog simulation experiment to study free oscillations of a damped simple pendulum | The characteristics of drive-free oscillations of a damped simple pendulum
under sinusoidal potential force field differ from those of the damped harmonic
oscillations. The frequency of oscillation of a large amplitude simple pendulum
decreases with increasing amplitude. Many prototype mechanical simple pendulum
have b... | 1903.06162v1 |
2019-03-15 | Frictional Damping in Biomimetic Scale Beam Oscillations | Stiff scales adorn the exterior surfaces of fishes, snakes, and many
reptiles. They provide protection from external piercing attacks and control
over global deformation behavior to aid locomotion, slithering, and swimming
across a wide range of environmental condition. In this letter, we investigate
the dynamic behavi... | 1903.06819v1 |
2019-04-08 | Damping control in viscoelastic beam dynamics | Viscoelasticity plays a key role in many practical applications and in
different reasearch fields, such as in seals, sliding-rolling contacts and
crack propagation. In all these contexts, a proper knowledge of the
viscoelastic modulus is very important. However, the experimental
characterization of the frequency depend... | 1904.03875v1 |
2019-04-28 | On the Kolmogorov dissipation law in a damped Navier-Stokes equation | We consider here the Navier-Stokes equations in $\mathbb{R}^{3}$ with a
stationary, divergence-free external force and with an additional damping term
that depends on two parameters. We first study the well-posedness of weak
solutions for these equations and then, for a particular set of the damping
parameters, we will... | 1904.12382v1 |
2019-04-23 | Entanglement sudden death and birth effects in two qubits maximally entangled mixed states under quantum channels | In the present article, the robustness of entanglement in two qubits
maximally entangled mixed states (MEME) have been studied under quantum
decoherence channels. Here we consider bit flip, phase flip, bit-phase-flip,
amplitude damping, phase damping and depolarization channels. To quantify the
entanglement, the concur... | 1904.12630v2 |
2019-05-23 | Strauss exponent for semilinear wave equations with scattering space dependent damping | It is believed or conjectured that the semilinear wave equations with
scattering space dependent damping admit the Strauss critical exponent, see
Ikehata-Todorova-Yordanov \cite{ITY}(the bottom in page 2) and
Nishihara-Sobajima-Wakasugi \cite{N2}(conjecture iii in page 4). In this work,
we are devoted to showing the co... | 1905.09445v2 |
2019-05-24 | Multicomponent Dark Matter in the Light of CALET and DAMPE | In the light of the latest measurements on the total $e^+ + e^-$ flux by
CALET and DAMPE experiments, we revisit the multicomponent leptonically
decaying dark matter (DM) explanations to the cosmic-ray electron/positron
excesses observed previously. Especially, we use the single and
double-component DM models to explor... | 1905.10136v3 |
2019-05-30 | Quantum dynamical speedup in correlated noisy channels | The maximal evolution speed of a quantum system can be represented by quantum
speed limit time (QSLT).We investigate QSLT of a two-qubit system passing
through a correlated channel (amplitude damping, phase damping, and
depolarizing).By adjusting the correlation parameter of channel and the initial
entanglement,a metho... | 1905.12911v3 |
2019-07-01 | Probing superfluid $^4\mathrm{He}$ with high-frequency nanomechanical resonators down to $\mathrm{mK}$ temperatures | Superfluids, such as superfluid $^3\mathrm{He}$ and $^4\mathrm{He}$, exhibit
a broad range of quantum phenomena and excitations which are unique to these
systems. Nanoscale mechanical resonators are sensitive and versatile force
detectors with the ability to operate over many orders of magnitude in damping.
Using nanom... | 1907.00970v1 |
2019-07-15 | Asymptotic profiles of solutions for regularity-loss type generalized thermoelastic plate equations and their applications | In this paper, we consider generalized thermoelastic plate equations with
Fourier's law of heat conduction. By introducing a threshold for decay
properties of regularity-loss, we investigate decay estimates of solutions
with/without regularity-loss in a framework of weighted $L^1$ spaces.
Furthermore, asymptotic profil... | 1907.06344v1 |
2019-07-23 | Ignatyuk damping factor: A semiclassical formula | Data on nuclear level densities extracted from transmission data or gamma
energy spectrum store the basic statistical information about nuclei at various
temperatures. Generally this extracted data goes through model fitting using
computer codes like CASCADE. However, recently established semiclassical
methods involvin... | 1907.09770v1 |
2019-08-13 | Dynamics of Riemann waves with sharp measure-controlled damping | This paper is concerned with locally damped semilinear wave equations defined
on compact Riemannian manifolds with boundary. We present a construction of
measure-controlled damping regions which are sharp in the sense that their
summed interior and boundary measures are arbitrarily small. The construction
of this class... | 1908.04814v1 |
2019-08-15 | Sharp polynomial decay rates for the damped wave equation with Hölder-like damping | We study decay rates for the energy of solutions of the damped wave equation
on the torus. We consider dampings invariant in one direction and bounded above
and below by multiples of $x^{\beta}$ near the boundary of the support and show
decay at rate $1/t^{\frac{\beta+2}{\beta+3}}$. In the case where $W$ vanishes
exact... | 1908.05631v3 |
2019-08-26 | Revisiting the Coulomb-Damped Harmonic Oscillator | The force of dry friction is studied extensively in introductory physics but
its effect on oscillations is hardly ever mentioned. Instead, to provide a
mathematically tractable introduction to damping, virtually all authors adopt a
viscous resistive force. While exposure to linear damping is of paramount
importance to ... | 1908.10363v1 |
2019-09-21 | Resonant absorption of kink oscillations in coronal flux tubes with continuous magnetic twist | There are observational evidences for the existence of twisted magnetic field
in the solar corona. Here, we have investigated resonant damping of the
magnetohydrodynamic (MHD) kink waves in magnetic flux tubes. A realistic model
of the tube with continuous magnetic twist and radially inhomogeneous density
profile has b... | 1909.09787v1 |
2019-10-22 | Controlled nonlinear magnetic damping in spin-Hall nano-devices | Large-amplitude magnetization dynamics is substantially more complex compared
to the low-amplitude linear regime, due to the inevitable emergence of
nonlinearities. One of the fundamental nonlinear phenomena is the nonlinear
damping enhancement, which imposes strict limitations on the operation and
efficiency of magnet... | 1910.09801v1 |
2019-11-05 | Exceptional points in dissipatively coupled spin dynamics | We theoretically investigate dynamics of classical spins exchange-coupled
through an isotropic medium. The coupling is treated at the adiabatic level of
the medium's response, which mediates a first-order in frequency dissipative
interaction along with an instantaneous Heisenberg exchange. The resultant
damped spin pre... | 1911.01619v2 |
2019-11-08 | Influence of Sensor Feedback Limitations on Power Oscillation Damping and Transient Stability | Fundamental sensor feedback limitations for improving rotor angle stability
using local frequency or phase angle measurement are derived. Using a
two-machine power system model, it is shown that improved damping of inter-area
oscillations must come at the cost of reduced transient stability margins,
regardless of the c... | 1911.03342v3 |
2019-11-12 | Non-uniform Stability of Damped Contraction Semigroups | We investigate the stability properties of strongly continuous semigroups
generated by operators of the form $A-BB^\ast$, where $A$ is a generator of a
contraction semigroup and $B$ is a possibly unbounded operator. Such systems
arise naturally in the study of hyperbolic partial differential equations with
damping on t... | 1911.04804v3 |
2020-01-31 | Dynamo in weakly collisional nonmagnetized plasmas impeded by Landau damping of magnetic fields | We perform fully kinetic simulations of flows known to produce dynamo in
magnetohydrodynamics (MHD), considering scenarios with low Reynolds number and
high magnetic Prandtl number, relevant for galaxy cluster scale fluctuation
dynamos. We find that Landau damping on the electrons leads to a rapid decay of
magnetic per... | 2001.11929v2 |
2020-03-05 | Sound propagation and quantum limited damping in a two-dimensional Fermi gas | Strongly interacting two-dimensional Fermi systems are one of the great
remaining challenges in many-body physics due to the interplay of strong local
correlations and enhanced long-range fluctuations. Here, we probe the
thermodynamic and transport properties of a 2D Fermi gas across the BEC-BCS
crossover by studying t... | 2003.02713v1 |
2020-03-09 | Proof-of-principle direct measurement of Landau damping strength at the Large Hadron Collider with an anti-damper | Landau damping is an essential mechanism for ensuring collective beam
stability in particle accelerators. Precise knowledge of how strong Landau
damping is, is key to making accurate predictions on beam stability for
state-of-the-art high energy colliders. In this paper we demonstrate an
experimental procedure that wou... | 2003.04383v1 |
2020-03-19 | An inverse-system method for identification of damping rate functions in non-Markovian quantum systems | Identification of complicated quantum environments lies in the core of
quantum engineering, which systematically constructs an environment model with
the aim of accurate control of quantum systems. In this paper, we present an
inverse-system method to identify damping rate functions which describe
non-Markovian environ... | 2003.08617v1 |
2020-04-23 | Damping of gravitational waves in 2-2-holes | A 2-2-hole is an explicit realization of a horizonless object that can still
very closely resemble a BH. An ordinary relativistic gas can serve as the
matter source for the 2-2-hole solution of quadratic gravity, and this leads to
a calculable area-law entropy. Here we show that it also leads to an estimate
of the damp... | 2004.11285v3 |
2020-05-04 | Plasmon damping in electronically open systems | Rapid progress in electrically-controlled plasmonics in solids poses a
question about effects of electronic reservoirs on the properties of plasmons.
We find that plasmons in electronically open systems [i.e. in (semi)conductors
connected to leads] are prone to an additional damping due to charge carrier
penetration in... | 2005.01680v1 |
2020-05-06 | Helical damping and anomalous critical non-Hermitian skin effect | Non-Hermitian skin effect and critical skin effect are unique features of
non-Hermitian systems. In this Letter, we study an open system with its
dynamics of single-particle correlation function effectively dominated by a
non-Hermitian damping matrix, which exhibits $\mathbb{Z}_2$ skin effect, and
uncover the existence... | 2005.02617v1 |
2020-05-16 | Gravitational Landau Damping for massive scalar modes | We establish the possibility of Landau damping for gravitational scalar waves
which propagate in a non-collisional gas of particles. In particular, under the
hypothesis of homogeneity and isotropy, we describe the medium at the
equilibrium with a J\"uttner-Maxwell distribution, and we analytically
determine the damping... | 2005.08010v4 |
2020-05-21 | On Strong Feller Property, Exponential Ergodicity and Large Deviations Principle for Stochastic Damping Hamiltonian Systems with State-Dependent Switching | This work focuses on a class of stochastic damping Hamiltonian systems with
state-dependent switching, where the switching process has a countably infinite
state space. After establishing the existence and uniqueness of a global weak
solution via the martingale approach under very mild conditions, the paper next
proves... | 2005.10730v1 |
2020-06-09 | Logarithmic decay for damped hypoelliptic wave and Schr{ö}dinger equations | We consider damped wave (resp. Schr{\"o}dinger and plate) equations driven by
a hypoelliptic "sum of squares" operator L on a compact manifold and a damping
function b(x). We assume the Chow-Rashevski-H{\"o}rmander condition at rank k
(at most k Lie brackets needed to span the tangent space) together with
analyticity o... | 2006.05122v1 |
2020-06-14 | Bulk Viscous Damping of Density Oscillations in Neutron Star Mergers | In this paper, we discuss the damping of density oscillations in dense
nuclear matter in the temperature range relevant to neutron star mergers. This
damping is due to bulk viscosity arising from the weak interaction ``Urca''
processes of neutron decay and electron capture. The nuclear matter is modelled
in the relativ... | 2006.07975v2 |
2020-06-15 | Exact solutions of a damped harmonic oscillator in a time dependent noncommutative space | In this paper we have obtained the exact eigenstates of a two dimensional
damped harmonic oscillator in time dependent noncommutative space. It has been
observed that for some specific choices of the damping factor and the time
dependent frequency of the oscillator, there exists interesting solutions of
the time depend... | 2006.08611v1 |
2020-06-16 | Enhancing nonlinear damping by parametric-direct internal resonance | Mechanical sources of nonlinear damping play a central role in modern
physics, from solid-state physics to thermodynamics. The microscopic theory of
mechanical dissipation [M. I . Dykman, M. A. Krivoglaz, Physica Status Solidi
(b) 68, 111 (1975)] suggests that nonlinear damping of a resonant mode can be
strongly enhanc... | 2006.09364v3 |
2020-06-22 | Blow-up for wave equation with the scale-invariant damping and combined nonlinearities | In this article, we study the blow-up of the damped wave equation in the
\textit{scale-invariant case} and in the presence of two nonlinearities. More
precisely, we consider the following equation: $$u_{tt}-\Delta
u+\frac{\mu}{1+t}u_t=|u_t|^p+|u|^q, \quad \mbox{in}\ \R^N\times[0,\infty), $$
with small initial data.\\ F... | 2006.12600v1 |
2020-06-30 | Negative Gilbert damping in cavity optomagnonics | Exceptional point (EP) associated with the parity-time (PT) symmetry breaking
is receiving considerable recent attention by the broad physics community. By
introducing balanced gain and loss, it has been realized in photonic, acoustic,
and electronic structures. However, the observation of magnonic EP remains
elusive. ... | 2006.16510v1 |
2020-07-10 | Decentralized Frequency Control using Packet-based Energy Coordination | This paper presents a novel frequency-responsive control scheme for
demand-side resources, such as electric water heaters. A frequency-dependent
control law is designed to provide damping from distributed energy resources
(DERs) in a fully decentralized fashion. This local control policy represents a
frequency-dependen... | 2007.05624v1 |
2020-07-30 | Origin of micron-scale propagation lengths of heat-carrying acoustic excitations in amorphous silicon | The heat-carrying acoustic excitations of amorphous silicon are of interest
because their mean free paths may approach micron scales at room temperature.
Despite extensive investigation, the origin of the weak acoustic damping in the
heat-carrying frequencies remains a topic of debate. Here, we report
measurements of t... | 2007.15777v2 |
2020-08-07 | Quantifying the evidence for resonant damping of coronal waves with foot-point wave power asymmetry | We use Coronal Multi-channel Polarimeter (CoMP) observations of propagating
waves in the solar corona and Bayesian analysis to assess the evidence of
models with resonant damping and foot-point wave power asymmetries. Two nested
models are considered. The reduced model considers resonant damping as the sole
cause of th... | 2008.03004v1 |
2020-08-22 | Sound damping in frictionless granular materials: The interplay between configurational disorder and inelasticity | We numerically investigate sound damping in a model of granular materials in
two dimensions. We simulate evolution of standing waves in disordered
frictionless disks and analyze their damped oscillations by velocity
autocorrelation functions and power spectra. We control the strength of
inelastic interactions between t... | 2008.09760v1 |
2020-09-27 | Squeezed comb states | Continuous-variable codes are an expedient solution for quantum information
processing and quantum communication involving optical networks. Here we
characterize the squeezed comb, a finite superposition of equidistant squeezed
coherent states on a line, and its properties as a continuous-variable encoding
choice for a... | 2009.12888v2 |
2020-11-16 | Switchable Damping for a One-Particle Oscillator | The possibility to switch the damping rate for a one-electron oscillator is
demonstrated, for an electron that oscillates along the magnetic field axis in
a Penning trap. Strong axial damping can be switched on to allow this
oscillation to be used for quantum nondemolition detection of the cyclotron and
spin quantum st... | 2011.08136v2 |
2020-11-17 | Challenging an experimental nonlinear modal analysis method with a new strongly friction-damped structure | In this work, we show that a recently proposed method for experimental
nonlinear modal analysis based on the extended periodic motion concept is well
suited to extract modal properties for strongly nonlinear systems (i.e. in the
presence of large frequency shifts, high and nonlinear damping, changes of the
mode shape, ... | 2011.08527v1 |
2020-11-27 | Thermal damping of Weak Magnetosonic Turbulence in the Interstellar Medium | We present a generic mechanism for the thermal damping of compressive waves
in the interstellar medium (ISM), occurring due to radiative cooling. We solve
for the dispersion relation of magnetosonic waves in a two-fluid (ion-neutral)
system in which density- and temperature-dependent heating and cooling
mechanisms are ... | 2011.13879v3 |
2021-02-10 | WAMS-Based Model-Free Wide-Area Damping Control by Voltage Source Converters | In this paper, a novel model-free wide-area damping control (WADC) method is
proposed, which can achieve full decoupling of modes and damp multiple critical
inter-area oscillations simultaneously using grid-connected voltage source
converters (VSCs). The proposed method is purely measurement based and requires
no knowl... | 2102.05494v1 |
2021-03-11 | Magnetoelastic Gilbert damping in magnetostrictive Fe$_{0.7}$Ga$_{0.3}$ thin films | We report an enhanced magnetoelastic contribution to the Gilbert damping in
highly magnetostrictive Fe$_{0.7}$Ga$_{0.3}$ thin films. This effect is
mitigated for perpendicular-to-plane fields, leading to a large anisotropy of
the Gilbert damping in all of the films (up to a factor of 10 at room
temperature). These clai... | 2103.07008v1 |
2021-04-08 | Fast optimization of viscosities for frequency-weighted damping of second-order systems | We consider frequency-weighted damping optimization for vibrating systems
described by a second-order differential equation. The goal is to determine
viscosity values such that eigenvalues are kept away from certain undesirable
areas on the imaginary axis. To this end, we present two complementary
techniques. First, we... | 2104.04035v1 |
2021-04-09 | Nonexistence result for the generalized Tricomi equation with the scale-invariant damping, mass term and time derivative nonlinearity | In this article, we consider the damped wave equation in the
\textit{scale-invariant case} with time-dependent speed of propagation, mass
term and time derivative nonlinearity. More precisely, we study the blow-up of
the solutions to the following equation: $$ (E) \quad u_{tt}-t^{2m}\Delta
u+\frac{\mu}{t}u_t+\frac{\nu^... | 2104.04393v2 |
2021-04-12 | Slow periodic oscillation without radiation damping: New evolution laws for rate and state friction | The dynamics of sliding friction is mainly governed by the frictional force.
Previous studies have shown that the laboratory-scale friction is well
described by an empirical law stated in terms of the slip velocity and the
state variable. The state variable represents the detailed physicochemical
state of the sliding i... | 2104.05398v2 |
2021-04-27 | Absence of a boson peak in anharmonic phonon models with Akhiezer-type damping | In a recent article M. Baggioli and A. Zaccone (Phys. Rev. Lett. {\bf 112},
145501 (2019)) claimed that an anharmonic damping, leading to a sound
attenuation proportional to $\omega^2$ (Akhiezer-type damping) would imply a
boson peak, i.e.\ a maximum in the vibrational density of states, divided by
the frequency square... | 2104.13076v1 |
2021-05-03 | Damping and polarization rates in near equilibrium state | The collision terms in spin transport theory are analyzed in Kadanoff-Baym
formalism for systems close to equilibrium. The non-equilibrium fluctuations in
spin distribution include both damping and polarization, with the latter
arising from the exchange between orbital and spin angular momenta. The damping
and polariza... | 2105.00915v1 |
2021-05-14 | Exact solution of damped harmonic oscillator with a magnetic field in a time dependent noncommutative space | In this paper we have obtained the exact eigenstates of a two dimensional
damped harmonic oscillator in the presence of an external magnetic field
varying with respect to time in time dependent noncommutative space. It has
been observed that for some specific choices of the damping factor, the time
dependent frequency ... | 2106.05182v1 |
2021-06-21 | Self-stabilization of light sails by damped internal degrees of freedom | We consider the motion of a light sail that is accelerated by a powerful
laser beam. We derive the equations of motion for two proof-of-concept sail
designs with damped internal degrees of freedom. Using linear stability
analysis we show that perturbations of the sail movement in all lateral degrees
of freedom can be d... | 2106.10961v1 |
2021-07-14 | Determining the source of phase noise: Response of a driven Duffing oscillator to low-frequency damping and resonance frequency fluctuations | We present an analytical calculation of the response of a driven Duffing
oscillator to low-frequency fluctuations in the resonance frequency and
damping. We find that fluctuations in these parameters manifest themselves
distinctively, allowing them to be distinguished. In the strongly nonlinear
regime, amplitude and ph... | 2107.06879v1 |
2021-07-27 | Spin transport-induced damping of coherent THz spin dynamics in iron | We study the damping of perpendicular standing spin-waves (PSSWs) in
ultrathin Fe films at frequencies up to 2.4 THz. The PSSWs are excited by
optically generated ultrashort spin current pulses, and probed optically in the
time domain. Analyzing the wavenumber and thickness dependence of the damping,
we demonstrate tha... | 2107.12812v2 |
2021-07-29 | A N-dimensional elastic\viscoelastic transmission problem with Kelvin-Voigt damping and non smooth coefficient at the interface | We investigate the stabilization of a multidimensional system of coupled wave
equations with only one Kelvin Voigt damping. Using a unique continuation
result based on a Carleman estimate and a general criteria of Arendt Batty, we
prove the strong stability of the system in the absence of the compactness of
the resolve... | 2107.13785v1 |
2021-09-03 | Stabilization of the damped plate equation under general boundary conditions | We consider a damped plate equation on an open bounded subset of R^d, or a
smooth manifold, with boundary, along with general boundary operators
fulfilling the Lopatinskii-Sapiro condition. The damping term acts on a region
without imposing a geometrical condition. We derive a resolvent estimate for
the generator of th... | 2109.01521v2 |
2021-09-07 | Fluid energy cascade rate and kinetic damping: new insight from 3D Landau-fluid simulations | Using an exact law for incompressible Hall magnetohydrodynamics (HMHD)
turbulence, the energy cascade rate is computed from three-dimensional HMHD-CGL
(bi-adiabatic ions and isothermal electrons) and Landau fluid (LF) numerical
simulations that feature different intensities of Landau damping over a broad
range of waven... | 2109.03123v2 |
2021-09-24 | Effect of nonlocal transformations on the linearizability and exact solvability of the nonlinear generalized modified Emden type equations | The nonlinear generalized modified Emden type equations (GMEE) are known to
be linearizable into simple harmonic oscillator (HO) or damped harmonic
oscillators (DHO) via some nonlocal transformations. Hereby, we show that the
structure of the nonlocal transformation and the linearizability into HO or DHO
determine the ... | 2109.12059v1 |
2021-12-27 | Trajectory attractors for 3D damped Euler equations and their approximation | We study the global attractors for the damped 3D Euler--Bardina equations
with the regularization parameter $\alpha>0$ and Ekman damping coefficient
$\gamma>0$ endowed with periodic boundary conditions as well as their damped
Euler limit $\alpha\to0$. We prove that despite the possible non-uniqueness of
solutions of th... | 2112.13691v1 |
2022-01-12 | Implicit Bias of MSE Gradient Optimization in Underparameterized Neural Networks | We study the dynamics of a neural network in function space when optimizing
the mean squared error via gradient flow. We show that in the
underparameterized regime the network learns eigenfunctions of an integral
operator $T_{K^\infty}$ determined by the Neural Tangent Kernel (NTK) at rates
corresponding to their eigen... | 2201.04738v1 |
2022-01-19 | Variance-Reduced Stochastic Quasi-Newton Methods for Decentralized Learning: Part II | In Part I of this work, we have proposed a general framework of decentralized
stochastic quasi-Newton methods, which converge linearly to the optimal
solution under the assumption that the local Hessian inverse approximations
have bounded positive eigenvalues. In Part II, we specify two fully
decentralized stochastic q... | 2201.07733v1 |
2022-01-19 | Active tuning of plasmon damping via light induced magnetism | Circularly polarized optical excitation of plasmonic nanostructures causes
coherent circulating motion of their electrons, which in turn, gives rise to
strong optically induced magnetization - a phenomenon known as the inverse
Faraday effect (IFE). In this study we report how the IFE also significantly
decreases plasmo... | 2201.07842v1 |
2022-01-27 | Effect of vertex corrections on the enhancement of Gilbert damping in spin pumping into a two-dimensional electron gas | We theoretically consider the effect of vertex correction on spin pumping
from a ferromagnetic insulator (FI) into a two-dimensional electron gas (2DEG)
in which the Rashba and Dresselhaus spin-orbit interactions coexist. The
Gilbert damping in the FI is enhanced by elastic spin-flipping or magnon
absorption. We show t... | 2201.11498v3 |
2022-03-02 | Simplified Stability Assessment of Power Systems with Variable-Delay Wide-Area Damping Control | Power electronic devices such as HVDC and FACTS can be used to improve the
damping of poorly damped inter-area modes in large power systems. This involves
the use of wide-area feedback signals, which are transmitted via communication
networks. The performance of the closed-loop system is strongly influenced by
the dela... | 2203.01362v1 |
2022-03-03 | Forward-modulated damping estimates and nonlocalized stability of periodic Lugiato-Lefever wave | In an interesting recent analysis, Haragus-Johnson-Perkins-de Rijk have shown
modulational stability under localized perturbations of steady periodic
solutions of the Lugiato-Lefever equation (LLE), in the process pointing out a
difficulty in obtaining standard "nonlinear damping estimates" on modulated
perturbation va... | 2203.01770v3 |
2022-03-31 | Observing Particle Energization above the Nyquist Frequency: An Application of the Field-Particle Correlation Technique | The field-particle correlation technique utilizes single-point measurements
to uncover signatures of various particle energization mechanisms in turbulent
space plasmas. The signature of Landau damping by electrons has been found in
both simulations and observations from Earth's magnetosheath using this
technique, but ... | 2204.00104v1 |
2022-04-06 | A Potential Based Quantization Procedure of the Damped Oscillator | Nowadays, two of the most prospering fields of physics are quantum computing
and spintronics. In both, the loss of information and dissipation plays a
crucial role. In the present work we formulate the quantization of the
dissipative oscillator, which aids understanding of the above mentioned, and
creates a theoretical... | 2204.02893v2 |
2022-04-19 | Role of shape anisotropy on thermal gradient-driven domain wall dynamics in magnetic nanowires | We investigate the magnetic domain wall (DW) dynamics in uniaxial/biaxial
nanowires under a thermal gradient (TG). The findings reveal that the DW
propagates toward the hotter region in both nanowires. The main physics of such
observations is the magnonic angular momentum transfer to the DW. The hard
(shape) anisotropy... | 2204.09101v2 |
2022-04-25 | Energy decay estimates for the wave equation with supercritical nonlinear damping | We consider a damped wave equation in a bounded domain. The damping is
nonlinear and is homogeneous with degree p -- 1 with p > 2. First, we show that
the energy of the strong solution in the supercritical case decays as a
negative power of t; the rate of decay is the same as in the subcritical or
critical cases, provi... | 2204.11494v1 |
2022-05-07 | Proposal for a Damping-Ring-Free Electron Injector for Future Linear Colliders | The current designs of future electron-positron linear colliders incorporate
large and complex damping rings to produce asymmetric beams for beamstrahlung
suppression. Here we present the design of an electron injector capable of
delivering flat electron beams with phase-space partition comparable to the
electron-beam ... | 2205.03736v1 |
2022-06-02 | Optimal Control of the 3D Damped Navier-Stokes-Voigt Equations with Control Constraints | In this paper, we consider the 3D Navier-Stokes-Voigt (NSV) equations with
nonlinear damping $|u|^{r-1}u, r\in[1,\infty)$ in bounded and space-periodic
domains. We formulate an optimal control problem of minimizing the curl of the
velocity field in the energy norm subject to the flow velocity satisfying the
damped NSV ... | 2206.00988v2 |
2022-06-05 | Stationary measures for stochastic differential equations with degenerate damping | A variety of physical phenomena involve the nonlinear transfer of energy from
weakly damped modes subjected to external forcing to other modes which are more
heavily damped. In this work we explore this in (finite-dimensional) stochastic
differential equations in $\mathbb R^n$ with a quadratic, conservative
nonlinearit... | 2206.02240v1 |
2022-07-13 | Energy decay for the time dependent damped wave equation | Energy decay is established for the damped wave equation on compact
Riemannian manifolds where the damping coefficient is allowed to depend on
time. Using a time dependent observability inequality, it is shown that the
energy of solutions decays at an exponential rate if the damping coefficient
satisfies a time depende... | 2207.06260v4 |
2022-08-04 | Lp-asymptotic stability of 1D damped wave equations with localized and nonlinear damping | In this paper, we study the $L^p$-asymptotic stability with $p\in (1,\infty)$
of the one-dimensional nonlinear damped wave equation with a localized damping
and Dirichlet boundary conditions in a bounded domain $(0,1)$. We start by
addressing the well-posedness problem. We prove the existence and the
uniqueness of weak... | 2208.02779v1 |
2022-08-07 | Damping of neutrino oscillations, decoherence and the lengths of neutrino wave packets | Spatial separation of the wave packets (WPs) of neutrino mass eigenstates
leads to decoherence and damping of neutrino oscillations. Damping can also be
caused by finite energy resolution of neutrino detectors or, in the case of
experiments with radioactive neutrino sources, by finite width of the emitted
neutrino line... | 2208.03736v2 |
2022-08-23 | Fate of exceptional points in the presence of nonlinearities | The non-Hermitian dynamics of open systems deal with how intricate coherent
effects of a closed system intertwine with the impact of coupling to an
environment. The system-environment dynamics can then lead to so-called
exceptional points, which are the open-system marker of phase transitions,
i.e., the closing of spec... | 2208.11205v2 |
2022-09-10 | Data-driven, multi-moment fluid modeling of Landau damping | Deriving governing equations of complex physical systems based on first
principles can be quite challenging when there are certain unknown terms and
hidden physical mechanisms in the systems. In this work, we apply a deep
learning architecture to learn fluid partial differential equations (PDEs) of a
plasma system base... | 2209.04726v1 |
2022-09-25 | Formation of the cosmic-ray halo: The role of nonlinear Landau damping | We present a nonlinear model of self-consistent Galactic halo, where the
processes of cosmic ray (CR) propagation and excitation/damping of MHD waves
are included. The MHD-turbulence, which prevents CR escape from the Galaxy, is
entirely generated by the resonant streaming instability. The key mechanism
controlling the... | 2209.12302v1 |
2022-10-10 | Finite time extinction for a critically damped Schr{ö}dinger equation with a sublinear nonlinearity | This paper completes some previous studies by several authors on the finite
time extinction for nonlinear Schr{\"o}dinger equation when the nonlinear
damping term corresponds to the limit cases of some ``saturating non-Kerr law''
$F(|u|^2)u=\frac{a}{\varepsilon+(|u|^2)^\alpha}u,$ with $a\in\mathbb{C},$
$\varepsilon\geq... | 2210.04493v4 |
2022-10-14 | Landau damping for gravitational waves in parity-violating theories | We discuss how tensor polarizations of gravitational waves can suffer Landau
damping in the presence of velocity birefringence, when parity symmetry is
explicitly broken. In particular, we analyze the role of the Nieh-Yan and
Chern-Simons terms in modified theories of gravity, showing how the
gravitational perturbation... | 2210.07673v2 |
2022-10-25 | Formation of shifted shock for the 3D compressible Euler equations with damping | In this paper, we show the shock formation of the solutions to the
3-dimensional (3D) compressible isentropic and irrotational Euler equations
with damping for the initial short pulse data which was first introduced by
D.Christodoulou\cite{christodoulou2007}. Due to the damping effect, the
largeness of the initial data... | 2210.13796v1 |
2022-10-30 | Dynamics of a class of extensible beams with degenerate and non-degenerate nonlocal damping | This work is concerned with new results on long-time dynamics of a class of
hyperbolic evolution equations related to extensible beams with three
distinguished nonlocal nonlinear damping terms. In the first possibly
degenerate case, the results feature the existence of a family of compact
global attractors and a thickn... | 2210.16851v1 |
2022-11-11 | Nonlinear fractional damped wave equation on compact Lie groups | In this paper, we deal with the initial value fractional damped wave equation
on $G$, a compact Lie group, with power-type nonlinearity. The aim of this
manuscript is twofold. First, using the Fourier analysis on compact Lie groups,
we prove a local in-time existence result in the energy space for the
fractional damped... | 2211.06155v1 |
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