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2024-03-07 | The stochastic Ravine accelerated gradient method with general extrapolation coefficients | In a real Hilbert space domain setting, we study the convergence properties
of the stochastic Ravine accelerated gradient method for convex differentiable
optimization. We consider the general form of this algorithm where the
extrapolation coefficients can vary with each iteration, and where the
evaluation of the gradi... | 2403.04860v2 |
1998-02-18 | Damping rates of hot Giant Dipole Resonances | The damping rate of hot giant dipole resonances (GDR) is investigated.
Besides Landau damping we consider collisions and density fluctuations as
contributions to the damping of GDR. Within the nonequilibrium Green's function
method we derive a non-Markovian kinetic equation. The linearization of the
latter one leads to... | 9802052v2 |
2015-12-11 | Ultra-low magnetic damping of a metallic ferromagnet | The phenomenology of magnetic damping is of critical importance for devices
that seek to exploit the electronic spin degree of freedom since damping
strongly affects the energy required and speed at which a device can operate.
However, theory has struggled to quantitatively predict the damping, even in
common ferromagn... | 1512.03610v1 |
2020-05-12 | Effective Viscous Damping Enables Morphological Computation in Legged Locomotion | Muscle models and animal observations suggest that physical damping is
beneficial for stabilization. Still, only a few implementations of mechanical
damping exist in compliant robotic legged locomotion. It remains unclear how
physical damping can be exploited for locomotion tasks, while its advantages as
sensor-free, a... | 2005.05725v2 |
2023-06-30 | A finite element method to compute the damping rate of oscillating fluids inside microfluidic nozzles | We introduce a finite element method for computing the damping rate of fluid
oscillations in nozzles of drop-on-demand (DoD) microfluidic devices. Accurate
knowledge of the damping rates for the least-damped oscillation modes following
droplet ejection is paramount for assessing jetting stability at higher jetting
freq... | 2307.00094v1 |
2023-07-05 | Optimal damping of vibrating systems: dependence on initial conditions | Common criteria used for measuring performance of vibrating systems have one
thing in common: they do not depend on initial conditions of the system. In
some cases it is assumed that the system has zero initial conditions, or some
kind of averaging is used to get rid of initial conditions. The aim of this
paper is to i... | 2307.02352v2 |
2024-01-18 | Multithermal apparent damping of slow waves due to strands with a Gaussian temperature distribution | Context. Slow waves in solar coronal loops are strongly damped. The current
theory of damping by thermal conduction cannot explain some observational
features.\n Aims. We investigate the propagation of slow waves in a coronal
loop built up from strands of different temperatures. \n Methods. We consider
the loop to have... | 2401.09803v1 |
2000-12-20 | Possible evidence for a variable fine structure constant from QSO absorption lines: motivations, analysis and results | An experimental search for variation in the fundamental coupling constants is
strongly motivated by modern high-energy physics theories. Comparison of quasar
absorption line spectra with laboratory spectra provides a sensitive probe for
variability of the fine structure constant, alpha, over cosmological
time-scales. W... | 0012419v5 |
2006-06-04 | k-Essence, Avoidance of the Weinberg's Cosmological Constant No-Go Theorem and Other Dark Energy Effects of Two Measures Field Theory | The dilaton-gravity sector of the Two Measures Field Theory (TMT) is explored
in detail in the context of cosmology. The dilaton \phi dependence of the
effective Lagrangian appears only as a result of the spontaneous breakdown of
the scale invariance. If no fine tuning is made, the effective \phi-Lagrangian
p(\phi,X) d... | 0606017v2 |
2006-03-20 | Higgs-Inflaton Symbiosis, Cosmological Constant Problem and Superacceleration Phase of the Universe in Two Measures Field Theory with Spontaneously Broken Scale Invariance | We study the scalar sector of the Two Measures Field Theory (TMT) model in
the context of cosmological dynamics. The scalar sector includes the inflaton
\phi and the Higgs \upsilon fields. The model possesses gauge and scale
invariance. The latter is spontaneously broken due to intrinsic features of the
TMT dynamics. I... | 0603150v1 |
2020-10-28 | Testing Gravity on Cosmic Scales: A Case Study of Jordan-Brans-Dicke Theory | We provide an end-to-end exploration of a distinct modified gravitational
theory in Jordan-Brans-Dicke (JBD) gravity, from an analytical and numerical
description of the background expansion and linear perturbations, to the
nonlinear regime captured with a hybrid suite of $N$-body simulations, to the
parameter constrai... | 2010.15278v2 |
2022-01-31 | A lower bound on the space overhead of fault-tolerant quantum computation | The threshold theorem is a fundamental result in the theory of fault-tolerant
quantum computation stating that arbitrarily long quantum computations can be
performed with a polylogarithmic overhead provided the noise level is below a
constant level. A recent work by Fawzi, Grospellier and Leverrier (FOCS 2018)
building... | 2202.00119v2 |
1996-06-07 | Abundances at High Redshifts: the Chemical Enrichment History of Damped Lyman-alpha Galaxies | Damped Lyman-alpha absorption systems found in the spectra of high redshift
quasars are believed to trace the interstellar gas in high redshift galaxies.
In this paper, we study the elemental abundances of C, N, O, Al, Si, S, Cr, Mn,
Fe, Ni, and Zn in a sample of 14 damped Lyman-alpha systems using high quality
echelle... | 9606044v1 |
1998-07-17 | Chaotic scattering on surfaces and collisional damping of collective modes | The damping of hot giant dipole resonances is investigated. The contribution
of surface scattering is compared with the contribution from interparticle
collisions. A unified response function is presented which includes surface
damping as well as collisional damping. The surface damping enters the response
via the Lyap... | 9807185v4 |
2000-09-08 | Probing High-Redshift Disks with Damped Lyman Alpha Systems | Evidence is presented that the damped Lyman alpha absorption systems are the
high-redshift (z > 3) progenitors of galaxy disks. I discuss kinematic evidence
that the damped Lyman Alpha systems are rotating disks. I also discuss
implications of the lack of metal-poor damped Lyman alpha systems with line
width Delta v > ... | 0009126v1 |
2006-09-10 | Damping of Compressional MHD Waves In Quiescent Prominences and Prominence-Corona Transition Region (PCTR) | The effects of radiative losses due to Newtonian cooling and MHD turbulence
have been considered to examine the spatial damping of linear compressional
waves in quiescent prominences and prominence-corona transition region (PCTR).
The radiative losses give acceptable damping lengths for the slow mode wave for
the radia... | 0609266v1 |
1997-10-14 | Damping of low-energy excitations of a trapped Bose condensate at finite temperatures | We present the theory of damping of low-energy excitations of a trapped Bose
condensate at finite temperatures, where the damping is provided by the
interaction of these excitations with the thermal excitations. We emphasize the
key role of stochastization in the behavior of the thermal excitations for
damping in non-s... | 9710128v3 |
2001-12-09 | Soliton dynamics in damped and forced Boussinesq equations | We investigate the dynamics of a lattice soliton on a monatomic chain in the
presence of damping and external forces. We consider Stokes and hydrodynamical
damping. In the quasi-continuum limit the discrete system leads to a damped and
forced Boussinesq equation. By using a multiple-scale perturbation expansion up
to s... | 0112148v1 |
2006-04-17 | The Highly Damped Quasinormal Modes of $d$-dimensional Reissner-Nordstrom Black Holes in the Small Charge Limit | We analyze in detail the highly damped quasinormal modes of $d$-dimensional
Reissner-Nordstr$\ddot{\rm{o}}$m black holes with small charge, paying
particular attention to the large but finite damping limit in which the
Schwarzschild results should be valid. In the infinite damping limit, we
confirm using different meth... | 0604073v2 |
2005-02-16 | Damping signatures in future neutrino oscillation experiments | We discuss the phenomenology of damping signatures in the neutrino
oscillation probabilities, where either the oscillating terms or the
probabilities can be damped. This approach is a possibility for tests of
non-oscillation effects in future neutrino oscillation experiments, where we
mainly focus on reactor and long-b... | 0502147v2 |
2000-08-22 | Local and Fundamental Mode Coupler Damping of the Transverse Wakefield in RDDS1 Linacs | In damping the wakefield generated by an electron beam traversing several
thousand X-band linacs in the NLC we utilise a Gaussian frequency distribution
of dipole modes to force the modes to deconstructively interfere, supplemented
with moderate damping achieved by coupling these modes to four attached
manifolds. Most ... | 0008211v1 |
2007-10-25 | Damping of Condensate Oscillation of a Trapped Bose Gas in a One-Dimensional Optical Lattice at Finite Temperatures | We study damping of a dipole oscillation in a Bose-Condensed gas in a
combined cigar-shaped harmonic trap and one-dimensional (1D) optical lattice
potential at finite temperatures. In order to include the effect of thermal
excitations in the radial direction, we derive a quasi-1D model of the
Gross-Pitaeavskii equation... | 0710.4610v1 |
2008-01-03 | Spin orbit precession damping in transition metal ferromagnets | We provide a simple explanation, based on an effective field, for the
precession damping rate due to the spin-orbit interaction. Previous effective
field treatments of spin-orbit damping include only variations of the state
energies with respect to the magnetization direction, an effect referred to as
the breathing Fer... | 0801.0549v1 |
2009-02-03 | Damping of filament thread oscillations: effect of the slow continuum | Transverse oscillations of small amplitude are commonly seen in
high-resolution observations of filament threads, i.e. the fine-structures of
solar filaments/prominences, and are typically damped in a few periods. Kink
wave modes supported by the thread body offer a consistent explanation of these
observed oscillations... | 0902.0572v2 |
2010-11-23 | Magnetohydrodynamic kink waves in two-dimensional non-uniform prominence threads | We analyse the oscillatory properties of resonantly damped transverse kink
oscillations in two-dimensional prominence threads. The fine structures are
modelled as cylindrically symmetric magnetic flux tubes with a dense central
part with prominence plasma properties and an evacuated part, both surrounded
by coronal pla... | 1011.5175v2 |
2011-04-04 | Plasmonic abilities of gold and silver spherical nanoantennas in terms of size dependent multipolar resonance frequencies and plasmon damping rates | Absorbing and emitting optical properties of a spherical plasmonic
nanoantenna are described in terms of the size dependent resonance frequencies
and damping rates of the multipolar surface plasmons (SP). We provide the
plasmon size characteristics for gold and silver spherical particles up to the
large size retardatio... | 1104.0565v1 |
2011-11-16 | Three-player quantum Kolkata restaurant problem under decoherence | Effect of quantum decoherence in a three-player quantum Kolkata restaurant
problem is investigated using tripartite entangled qutrit states. Amplitude
damping, depolarizing, phase damping, trit-phase flip and phase flip channels
are considered to analyze the behaviour of players payoffs. It is seen that
Alice's payoff ... | 1111.3913v2 |
2012-07-27 | The effect of non-uniform damping on flutter in axial flow and energy harvesting strategies | The problem of energy harvesting from flutter instabilities in flexible
slender structures in axial flows is considered. In a recent study, we used a
reduced order theoretical model of such a system to demonstrate the feasibility
for harvesting energy from these structures. Following this preliminary study,
we now cons... | 1207.6484v1 |
2012-11-20 | Damping rates of surface plasmons for particles of size from nano- to micrometers; reduction of the nonradiative decay | Damping rates of multipolar, localized surface plasmons (SP) of gold and
silver nanospheres of radii up to $1000nm$ were found with the tools of
classical electrodynamics. The significant increase in damping rates followed
by noteworthy decrease for larger particles takes place along with substantial
red-shift of plasm... | 1211.4781v1 |
2013-10-23 | Landau damping in a collisionless dipolar Bose gas | We present a theory for the Landau damping of low energy quasi-particles in a
collisionless, quasi-2D dipolar Bose gas and produce expressions for the
damping rate in uniform and non-uniform systems. Using simple energy-momentum
conservation arguments, we show that in the homogeneous system, the nature of
the low energ... | 1310.6386v1 |
2014-11-28 | Non-equilibrium thermodynamics of damped Timoshenko and damped Bresse systems | In this paper, we cast damped Timoshenko and damped Bresse systems into a
general framework for non-equilibrium thermodynamics, namely the GENERIC
(General Equation for Non-Equilibrium Reversible-Irreversible Coupling)
framework. The main ingredients of GENERIC consist of five building blocks: a
state space, a Poisson ... | 1412.0038v2 |
2014-12-08 | Bi-$\cal{PT}$ symmetry in nonlinearly damped dynamical systems and tailoring $\cal{PT}$ regions with position dependent loss-gain profiles | We investigate the remarkable role of position dependent damping in
determining the parametric regions of symmetry breaking in nonlinear
$\cal{PT}$-symmetric systems. We illustrate the nature of $\cal{PT}$-symmetry
preservation and breaking with reference to a remarkable integrable scalar
nonlinear system. In the two d... | 1412.2574v3 |
2015-09-04 | Damped transverse oscillations of interacting coronal loops | Damped transverse oscillations of magnetic loops are routinely observed in
the solar corona. This phenomenon is interpreted as standing kink
magnetohydrodynamic waves, which are damped by resonant absorption owing to
plasma inhomogeneity across the magnetic field. The periods and damping times
of these oscillations can... | 1509.01487v1 |
2015-09-14 | Beliaev damping in quasi-2D dipolar condensates | We study the effects of quasiparticle interactions in a quasi-two dimensional
(quasi-2D), zero-temperature Bose-Einstein condensate of dipolar atoms, which
can exhibit a roton-maxon feature in its quasiparticle spectrum. Our focus is
the Beliaev damping process, in which a quasiparticle collides with the
condensate and... | 1509.04217v1 |
2015-12-08 | Thermal energies of classical and quantum damped oscillators coupled to reservoirs | We consider the global thermal state of classical and quantum harmonic
oscillators that interact with a reservoir. Ohmic damping of the oscillator can
be exactly treated with a 1D scalar field reservoir, whereas general non-Ohmic
damping is conveniently treated with a continuum reservoir of harmonic
oscillators. Using ... | 1512.02551v2 |
2016-05-17 | Simultaneous Identification of Damping Coefficient and Initial Value in PDEs from boundary measurement | In this paper, the simultaneous identification of damping or anti-damping
coefficient and initial value for some PDEs is considered. An identification
algorithm is proposed based on the fact that the output of system happens to be
decomposed into a product of an exponential function and a periodic function.
The former ... | 1605.05063v1 |
2016-08-30 | Optimal damping ratios of multi-axial perfectly matched layers for elastic-wave modeling in general anisotropic media | The conventional Perfectly Matched Layer (PML) is unstable for certain kinds
of anisotropic media. This instability is intrinsic and independent of PML
formulation or implementation. The Multi-axial PML (MPML) removes such
instability using a nonzero damping coefficient in the direction parallel with
the interface betw... | 1608.08326v3 |
2016-10-10 | A Five-Freedom Active Damping and Alignment Device Used in the Joule Balance | Damping devices are necessary for suppressing the undesired coil motions in
the watt/joule balance. In this paper, an active electromagnetic damping
device, located outside the main magnet, is introduced in the joule balance
project. The presented damping device can be used in both dynamic and static
measurement modes.... | 1610.02799v1 |
2016-10-01 | The destabilizing effect of external damping: Singular flutter boundary for the Pfluger column with vanishing external dissipation | Elastic structures loaded by nonconservative positional forces are prone to
instabilities induced by dissipation: it is well-known in fact that internal
viscous damping destabilizes the marginally stable Ziegler's pendulum and
Pfluger column (of which the Beck's column is a special case), two structures
loaded by a tan... | 1611.03886v1 |
2017-10-10 | A four-field gyrofluid model with neoclassical effects for the study of the rotation velocity of magnetic islands in tokamaks | A four-field system of equations which includes the neoclassical flow damping
effects and the lowest-order finite-Larmor-radius (FLR) corrections is deduced
from a system of gyrofluid equations. The FLR corrections to the poloidal flow
damping are calculated by solving a simplified version of the gyrokinetic
equation. ... | 1710.03585v1 |
2017-10-13 | Mode-Dependent Damping in Metallic Antiferromagnets Due to Inter-Sublattice Spin Pumping | Damping in magnetization dynamics characterizes the dissipation of magnetic
energy and is essential for improving the performance of spintronics-based
devices. While the damping of ferromagnets has been well studied and can be
artificially controlled in practice, the damping parameters of
antiferromagnetic materials ar... | 1710.04766v1 |
2017-12-04 | Resonance oscillation of a damped driven simple pendulum | The resonance characteristics of a driven damped harmonic oscillator are well
known. Unlike harmonic oscillators which are guided by parabolic potentials, a
simple pendulum oscillates under sinusoidal potentials. The problem of an
undamped pendulum has been investigated to a great extent. However, the
resonance charact... | 1712.01032v1 |
2018-01-17 | On Global Existence and Blow-up for Damped Stochastic Nonlinear Schrödinger Equation | In this paper, we consider the well-posedness of the weakly damped stochastic
nonlinear Schr\"odinger(NLS) equation driven by multiplicative noise. First, we
show the global existence of the unique solution for the damped stochastic NLS
equation in critical case. Meanwhile, the exponential integrability of the
solution... | 1801.05630v1 |
2018-05-04 | Effective damping enhancement in noncollinear spin structures | Damping mechanisms in magnetic systems determine the lifetime, diffusion and
transport properties of magnons, domain walls, magnetic vortices, and
skyrmions. Based on the phenomenological Landau-Lifshitz-Gilbert equation, here
the effective damping parameter in noncollinear magnetic systems is determined
describing the... | 1805.01815v2 |
2018-05-16 | Stabilization rates for the damped wave equation with Hölder-regular damping | We study the decay rate of the energy of solutions to the damped wave
equation in a setup where the geometric control condition is violated. We
consider damping coefficients which are $0$ on a strip and vanish like
polynomials, $x^{\beta}$. We prove that the semigroup cannot be stable at rate
faster than $1/t^{(\beta+2... | 1805.06535v3 |
2018-08-20 | Gilbert damping of [Co/Pd]n/Py multilayer thin films | Understanding the Gilbert damping in exchange-coupled multilayer materials is
particularly important to develop future fast switching spintronics devices.
Here, we report an experimental investigation of temperature-dependent Gilbert
damping in [Co/Pd]n/Py multilayer films of varying the number of Co/Pd
repetitions by ... | 1808.06515v2 |
2019-03-01 | Comprehensive Study of Neutrino-Dark Matter Mixed Damping | Mixed damping is a physical effect that occurs when a heavy species is
coupled to a relativistic fluid which is itself free streaming. As a cross-case
between collisional damping and free-streaming, it is crucial in the context of
neutrino-dark matter interactions. In this work, we establish the parameter
space relevan... | 1903.00540v2 |
2019-08-04 | Efficient spin excitation via ultrafast damping-like torques in antiferromagnets | Damping effects form the core of many emerging concepts for high-speed
spintronic applications. Important characteristics such as device switching
times and magnetic domain-wall velocities depend critically on the damping
rate. While the implications of spin damping for relaxation processes are
intensively studied, dam... | 1908.01359v3 |
2019-10-31 | Gyrokinetic investigation of the damping channels of Alfvén modes in ASDEX Upgrade | The linear destabilization and nonlinear saturation of energetic-particle
driven Alfv\'enic instabilities in tokamaks strongly depend on the damping
channels. In this work, the collisionless damping mechanisms of Alfv\'enic
modes are investigated within a gyrokinetic framework, by means of global
simulations with the p... | 1910.14489v1 |
2020-03-13 | Anharmonic phonon damping enhances the $T_c$ of BCS-type superconductors | A theory of superconductivity is presented where the effect of anharmonicity,
as entailed in the acoustic, or optical, phonon damping, is explicitly
considered in the pairing mechanism. The gap equation is solved including
diffusive Akhiezer damping for longitudinal acoustic phonons or Klemens damping
for optical phono... | 2003.06220v2 |
2020-03-29 | Stability results for an elastic-viscoelastic waves interaction systems with localized Kelvin-Voigt damping and with an internal or boundary time delay | We investigate the stability of a one-dimensional wave equation with non
smooth localized internal viscoelastic damping of Kelvin-Voigt type and with
boundary or localized internal delay feedback. The main novelty in this paper
is that the Kelvin-Voigt and the delay damping are both localized via non
smooth coefficient... | 2003.12967v1 |
2020-09-16 | Fast convex optimization via inertial dynamics combining viscous and Hessian-driven damping with time rescaling | In a Hilbert setting, we develop fast methods for convex unconstrained
optimization. We rely on the asymptotic behavior of an inertial system
combining geometric damping with temporal scaling. The convex function to
minimize enters the dynamic via its gradient. The dynamic includes three
coefficients varying with time,... | 2009.07620v1 |
2020-12-27 | Quantum speed limit time in relativistic frame | We investigate the roles of the relativistic effect on the speed of evolution
of a quantum system coupled with amplitude damping channels. We find that the
relativistic effect speed-up the quantum evolution to a uniform evolution speed
of open quantum systems for the damping parameter $p_{\tau}\lesssim
p_{\tau_{c0}}.$ ... | 2012.13859v2 |
2021-01-07 | Mechanisms behind large Gilbert damping anisotropies | A method with which to calculate the Gilbert damping parameter from a
real-space electronic structure method is reported here. The anisotropy of the
Gilbert damping with respect to the magnetic moment direction and local
chemical environment is calculated for bulk and surfaces of Fe$_{50}$Co$_{50}$
alloys from first pr... | 2101.02794v2 |
2021-06-23 | Regularization of central forces with damping in two and three-dimensions | Regularization of damped motion under central forces in two and
three-dimensions are investigated and equivalent, undamped systems are
obtained. The dynamics of a particle moving in $\frac{1}{r}$ potential and
subjected to a damping force is shown to be regularized a la Levi-Civita. We
then generalize this regularizati... | 2106.12134v1 |
2021-07-06 | Theory of vibrators with variable-order fractional forces | In this paper, we present a theory of six classes of vibrators with
variable-order fractional forces of inertia, damping, and restoration. The
novelty and contributions of the present theory are reflected in six aspects.
1) Equivalent motion equations of those variable-order fractional vibrators are
proposed. 2) The an... | 2107.02340v2 |
2021-08-15 | Exponential stability of a damped beam-string-beam transmission problem | We consider a beam-string-beam transmission problem, where two structurally
damped or undamped beams are coupled with a frictionally damped string by
transmission conditions. We show that for this type of structure, the
dissipation produced by the frictional part is strong enough to produce
exponential decay of the sol... | 2108.06749v1 |
2021-09-10 | Fourth-order dynamics of the damped harmonic oscillator | It is shown that the classical damped harmonic oscillator belongs to the
family of fourth-order Pais-Uhlenbeck oscillators. It follows that the
solutions to the damped harmonic oscillator equation make the Pais-Uhlenbeck
action stationary. Two systematic approaches are given for deriving the
Pais-Uhlenbeck action from ... | 2109.06034v1 |
2022-01-13 | Damping of Alfvén waves in MHD turbulence and implications for cosmic ray streaming instability and galactic winds | Alfv\'{e}nic component of MHD turbulence damps Alfv\'{e}nic waves. The
consequences of this effect are important for many processes, from cosmic ray
(CR) propagation to launching outflows and winds in galaxies and other
magnetized systems. We discuss the differences in the damping of the streaming
instability by turbul... | 2201.05168v1 |
2022-03-14 | Investigation of nonlinear squeeze-film damping involving rarefied gas effect in micro-electro-mechanical-systems | In this paper, the nonlinear squeeze-film damping (SFD) involving rarefied
gas effect in the micro-electro-mechanical-systems (MEMS) is investigated.
Considering the motion of structures (beam, cantilever, and membrane) in MEMS,
the dynamic response of structure will be influenced largely by the
squeeze-film damping. I... | 2203.06902v1 |
2022-05-21 | Noether symmetries and first integrals of damped harmonic oscillator | Noether theorem establishes an interesting connection between symmetries of
the action integral and conservation laws of a dynamical system. The aim of the
present work is to classify the damped harmonic oscillator problem with respect
to Noether symmetries and to construct corresponding conservation laws for all
over-... | 2205.10525v1 |
2023-01-31 | The emergence of soft-glassy mechanics in simulated foams | Several seemingly different soft materials, including foams, cells, and many
complex fluids, exhibit remarkably similar rheological properties and
microscopic dynamics, termed soft glassy mechanics. Here, we show that such
behavior emerges from a simple model of a damped ripening foam, for
sufficiently weak damping. In... | 2301.13400v1 |
2023-02-13 | Thickness and temperature dependent damping in La$_{0.67}$Sr$_{0.33}$MnO$_{3}$ epitaxial films | The damping of La0.67Sr0.33MnO3 (LSMO) epitaxial films as a function of
thickness at different temperatures was studied. The competition between two
scattering types (\r{ho}-like and {\sigma}-like) with entirely distinct
thickness and temperature dependencies resulted in complicated damping
behavior. The behavior of {\... | 2302.06099v3 |
2023-09-15 | On the formation of singularities for the slightly supercritical NLS equation with nonlinear damping | We consider the focusing, mass-supercritical NLS equation augmented with a
nonlinear damping term. We provide sufficient conditions on the nonlinearity
exponents and damping coefficients for finite-time blow-up. In particular,
singularities are formed for focusing and dissipative nonlinearities of the
same power, provi... | 2309.08281v1 |
1998-05-07 | Discovery of z=0.0912 and z=0.2212 Damped Lyman-alpha Absorption Line Systems Toward the Quasar OI 363: Limits on the Nature of Damped Lyman-alpha Galaxies | The discovery of a z_abs = 0.0912 damped Lyman-alpha absorption-line system
in the HST-FOS ultraviolet spectrum of the quasar OI 363 (0738+313) is
reported. This is the lowest redshift quasar damped Lyman-alpha system known.
Its neutral hydrogen column density is N(HI) = 1.5(+/- 0.2) E21 atoms/cm^2,
which easily exceed... | 9805093v1 |
2008-01-24 | Attenuation of small-amplitude oscillations in a prominence-corona model with a transverse magnetic field | Small-amplitude prominence oscillations are usually damped after a few
periods. We study the attenuation of non-adiabatic magnetoacoustic waves in a
slab prominence embedded in the coronal medium. We assume an equilibrium
configuration with a transverse magnetic field to the slab axis and investigate
wave damping by th... | 0801.3744v2 |
2010-04-26 | Selective spatial damping of propagating kink waves due to resonant absorption | There is observational evidence of propagating kink waves driven by
photospheric motions. These disturbances, interpreted as kink
magnetohydrodynamic (MHD) waves are attenuated as they propagate upwards in the
solar corona. In this paper we show that resonant absorption provides a simple
explanation to the spatial damp... | 1004.4468v1 |
2011-04-10 | Spatial Damping of Propagating Kink Waves Due to Resonant Absorption: Effect of Background Flow | Observations show the ubiquitous presence of propagating magnetohydrodynamic
(MHD) kink waves in the solar atmosphere. Waves and flows are often observed
simultaneously. Due to plasma inhomogeneity in the perpendicular direction to
the magnetic field, kink waves are spatially damped by resonant absorption. The
presence... | 1104.1791v1 |
2013-02-08 | On the Damping-Induced Self-Recovery Phenomenon in Mechanical Systems with Several Unactuated Cyclic Variables | The damping-induced self-recovery phenomenon refers to the fundamental
property of underactuated mechanical systems: if an unactuated cyclic variable
is under a viscous damping-like force and the system starts from rest, then the
cyclic variable will always move back to its initial condition as the actuated
variables c... | 1302.2109v1 |
2016-07-06 | Damping of Alfven waves by Turbulence and its Consequences: from Cosmic-Rays Streaming to Launching Winds | This paper considers turbulent damping of Alfven waves in magnetized plasmas.
We identify two cases of damping, one related to damping of cosmic rays
streaming instability, the other related to damping of Alfven waves emitted by
a macroscopic wave source, e.g. stellar atmosphere. The physical difference
between the two... | 1607.02042v1 |
2018-01-18 | Quantum Landau damping in dipolar Bose-Einstein condensates | We consider Landau damping of elementary excitations in Bose-Einstein
condensates (BECs) with dipolar interactions. We discuss quantum and
quasi-classical regimes of Landau damping. We use a generalized wave-kinetic
description of BECs which, apart from the long range dipolar interactions, also
takes into account the q... | 1801.06256v1 |
2019-02-26 | Enhanced Gilbert Damping in Re doped FeCo Films: A Combined Experimental and Theoretical Study | The effects of rhenium doping in the range 0 to 10 atomic percent on the
static and dynamic magnetic properties of Fe65Co35 thin films have been studied
experimentally as well as with first principles electronic structure
calculations focusing on the change of the saturation magnetization and the
Gilbert damping parame... | 1902.09896v1 |
2020-05-31 | Optimal decay rates of the compressible Euler equations with time-dependent damping in $\mathbb R^n$: (I) under-damping case | This paper is concerned with the multi-dimensional compressible Euler
equations with time-dependent damping of the form
$-\frac{\mu}{(1+t)^\lambda}\rho\boldsymbol u$ in $\mathbb R^n$, where $n\ge2$,
$\mu>0$, and $\lambda\in[0,1)$. When $\lambda>0$ is bigger, the damping effect
time-asymptotically gets weaker, which is ... | 2006.00401v1 |
2022-08-17 | Anti-parity-time symmetry hidden in a damping linear resonator | Phase transition from the over-damping to under-damping states is a
ubiquitous phenomenon in physical systems. However, what kind of symmetry is
broken associated with this phase transition remains unclear. Here, we discover
that this phase transition is determined by an anti-parity-time
(anti-$\mathcal{PT}$) symmetry ... | 2208.08187v2 |
1996-12-10 | Collisional matter-phase damping in Bose-condensed gas | Collisional damping of the excitations in a Bose-condensed gas is
investigated over the wide range of energies and temperatures. Numerical
results for the damping rate are presented and a number of asymptotic and
interpolating expressions for it are derived. | 9612086v1 |
2001-11-29 | Tensor form of magnetization damping | A tensor form of phenomenological damping is derived for small magnetization
motions. This form reflects basic physical relaxation processes for a general
uniformly magnetized particle or film. Scalar Landau-Lifshitz damping is found
to occur only for two special cases of system symmetry. | 0111566v1 |
1999-07-28 | An effective relaxation-time approach to collisionless quark-gluon plasma | We present an effective relaxation-time theory to study the collisionless
quark-gluon plasma. Applying this method we calculate the damping rate to be of
order $g^2T$ and find plasmon scattering is the damping mechanism. The damping
for the transverse mode is stronger than the longitudinal one. | 9907526v1 |
1999-11-16 | Dynamical resummation and damping in the O(N) model | A general real-time formalism is developed to resum the self-energy operator
of broken symmetry scalar field theories in form of self-consistent gap
equations for the spectral function. The solution of the equations is
approximated with finite lifetime quasi-particles. In the Landau damping rates
viscosity terms, analo... | 9911374v1 |
1993-03-24 | On the Quantizations of the Damped Systems | Based on a simple observation that a classical second order differential
equation may be decomposed into a set of two first order equations, we
introduce a Hamiltonian framework to quantize the damped systems. In
particular, we analyze the system of a linear damped harmonic oscillator and
demonstrate that the time evol... | 9303137v1 |
2006-01-09 | Energy decay for damped wave equations on partially rectangular domains | We consider the wave equation with a damping term on a partially rectangular
planar domain, assuming that the damping is concentrated close to the
non-rectangular part of the domain. Polynomial decay estimates for the energy
of the solution are established. | 0601195v1 |
2002-06-07 | Resonant states and classical damping | Using Koopman's approach to classical dynamical systems we show that the
classical damping may be interpreted as appearance of resonant states of the
corresponding Koopman's operator. It turns out that simple classical damped
systems give rise to discrete complex spectra. Therefore, the corresponding
generalized eigenv... | 0206009v1 |
2004-03-12 | Factorization of damped wave equations with cubic nonlinearities | The recent factorization scheme that we introduced for nonlinear polynomial
ODEs in math-ph/0401040 is applied to the interesting case of damped wave
equations with cubic nonlinearities. Traveling kink solutions are possible in
the plane defined by the kink velocity versus the damping coefficient only
along hyperbolas ... | 0403022v1 |
2002-08-07 | Toward a Universal Model of Damping--Modified Coulomb Friction | A modification of Coulomb's law of friction uses a variable coefficient of
friction that depends on a power law in the energy of mechanical oscillation.
Through the use of three different exponents: 0, 1/2 and 1; all commonly
encountered non-viscous forms of damping are accommodated. The nonlinear model
appears to yiel... | 0208025v1 |
2002-12-19 | Trapped particle bounds on stimulated scatter in the large k/kD regime | In the strongly damped regime, the convective gain rate for stimulated
scatter varies inversely with the plasma wave damping rate. Electron trapping
effects reduce the damping but also lead to loss of resonance for large enough
amplitude waves. This leads to a gain rate bound and corresponding optimum
scattered light f... | 0212071v1 |
2003-02-03 | Oscillator damping with more than one mechanism of internal friction dissipation | The author's modified Coulomb damping model has been generalized to
accommodate internal friction that derives from several dissipation mechanisms
acting simultaneously. Because of its fundamental nonlinear nature, internal
friction damping causes the quality factor Q of an oscillator in free-decay to
change in time. E... | 0302003v1 |
2003-02-15 | Anisotropic Internal Friction Damping | The mechanical damping properties of sheet polaroid material have been
studied with a physical pendulum. The polaroid samples were placed under the
knife-edges of the pendulum, which was operated in free-decay at a period in
the vicinity of 10 s. With the edges oriented parallel to the direction of the
long molecular c... | 0302055v1 |
2006-08-07 | Study of the Damped Pendulum | Experiments on the oscillatory motion of a suspended bar magnet throws light
on the damping effects acting on the pendulum. The viscous drag offered by air
was found the be the main contributor for slowing the pendulum down. The nature
and magnitude of the damping effects were shown to be strongly dependent on the
ampl... | 0608071v1 |
1995-02-27 | Quantum Oscillator with Kronig-Penney Excitation in Different Regimes of Damping | There are discussed the exact solution of the time--dependent Schr\"{o}dinger
equation for a damped quantum oscillator subject to a periodical frequency
delta--kicks describing squeezed states which are expressed in terms of
Chebyshev polynomials. The cases of strong and weak damping are investigated in
the frame of Ca... | 9502023v1 |
2008-11-07 | Asymptotic stability of the wave equation on compact surfaces and locally distributed damping - A sharp result | This paper is concerned with the study of the wave equation on compact
surfaces and locally distributed damping. We study the case where the damping
is effective in a well-chosen subset of arbitrarily small measure. | 0811.1190v1 |
2008-11-07 | Uniform Stabilization of the wave equation on compact surfaces and locally distributed damping | This paper is concerned with the study of the wave equation on compact
surfaces and locally distributed damping. We study the case where the damping
is effective on the complement of visible umbilical sets. | 0811.1204v1 |
2010-11-20 | Enhanced damping of ion acoustic waves in dense plasmas | A theory for the ion acoustic wave damping in dense plasmas and warm dense
matter, accounting for the Umklapp process, is presented. A higher decay rate
compared to the prediction from the Landau damping theory is predicted for
high-Z dense plasmas where the electron density ranges from $10^{21}$ to $
10^{24} \mathrm{c... | 1011.4607v1 |
2012-05-16 | Enhanced coupling design of a detuned damped structure for clic | The key feature of the improved coupling design in the Damped Detuned
Structure (DDS) is focused on the four manifolds. Rectangular geometry slots
and rectangular manifolds are used. This results in a significantly stronger
coupling to the manifolds compared to the previous design. We describe the new
design together w... | 1205.3590v1 |
2012-06-26 | On the $L^{2}$-critical nonlinear Schrödinger Equation with a nonlinear damping | We consider the Cauchy problem for the $L^{2}$-critical nonlinear
Schr\"{o}dinger equation with a nonlinear damping. According to the power of
the damping term, we prove the global existence or the existence of finite time
blowup dynamics with the log-log blow-up speed for $\|\nabla u(t)\|_{L^2}$. | 1206.6082v4 |
2012-10-12 | Semi-linear wave equations with effective damping | We study the Cauchy problem for the semi-linear damped wave equation in any
space dimension. We assume that the time-dependent damping term is effective.
We prove the global existence of small energy data solutions in the
supercritical case. | 1210.3493v1 |
2012-12-08 | A note on the lifespan of solutions to the semilinear damped wave equation | This paper concerns estimates of the lifespan of solutions to the semilinear
damped wave equation. We give upper estimates of the lifespan for the
semilinear damped wave equation with variable coefficients in all space
dimensions. | 1212.1772v3 |
2012-12-10 | Strongly damped wave equation with exponential nonlinearities | In this paper, we study the initial boundary value problem for the two
dimensional strong damped wave equation with exponentially growing source and
damping terms. We first show the well-posedness of this problem and then prove
the existence of the global attractor in $(H_{0}^{1}(\Omega)\cap
L^{\infty}(\Omega))\times L... | 1212.2180v2 |
2013-10-27 | Exponential decay of solutions for the plate equation with localized damping | In this paper, we give positive answer to the open question raised in [E.
Zuazua, Exponential decay for the semilinear wave equation with localized
damping in unbounded domains. J. Math. Pures Appl., 70 (1991) 513--529] on the
exponential decay of solutions for the semilinear plate equation with localized
damping. | 1310.7243v3 |
2014-03-07 | Landau damping in Sobolev spaces for the Vlasov-HMF model | We consider the Vlasov-HMF (Hamiltonian Mean-Field) model. We consider
solutions starting in a small Sobolev neighborhood of a spatially homogeneous
state satisfying a linearized stability criterion (Penrose criterion). We prove
that these solutions exhibit a scattering behavior to a modified state, which
implies a non... | 1403.1668v2 |
2015-03-30 | Damping to prevent the blow-up of the Korteweg-de Vries equation | We study the behavior of the solution of a generalized damped KdV equation
$u_t + u_x + u_{xxx} + u^p u_x + \mathscr{L}_{\gamma}(u)= 0$. We first state
results on the local well-posedness. Then when $p \geq 4$, conditions on
$\mathscr{L}_{\gamma}$ are given to prevent the blow-up of the solution.
Finally, we numericall... | 1503.08559v1 |
2015-06-16 | Fast energy decay for wave equations with variable damping coefficients in the 1-D half line | We derive fast decay estimates of the total energy for wave equations with
localized variable damping coefficients, which are dealt with in the one
dimensional half line $(0,\infty)$. The variable damping coefficient vanishes
near the boundary $x = 0$, and is effective critically near spatial infinity $x
= \infty$. | 1506.04851v1 |
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