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2020-07-05 | Oscillation of damped second order quasilinear wave equations with mixed arguments | Following the previous work [1], we investigate the impact of damping on the
oscillation of smooth solutions to some kind of quasilinear wave equations with
Robin and Dirichlet boundary condition. By using generalized Riccati
transformation and technical inequality method, we give some sufficient
conditions to guarante... | 2007.02284v1 |
2020-07-08 | A competition on blow-up for semilinear wave equations with scale-invariant damping and nonlinear memory term | In this paper, we investigate blow-up of solutions to semilinear wave
equations with scale-invariant damping and nonlinear memory term in
$\mathbb{R}^n$, which can be represented by the Riemann-Liouville fractional
integral of order $1-\gamma$ with $\gamma\in(0,1)$. Our main interest is to
study mixed influence from da... | 2007.03954v2 |
2020-08-02 | Quantum capacity analysis of multi-level amplitude damping channels | The set of Multi-level Amplitude Damping (MAD) quantum channels is introduced
as a generalization of the standard qubit Amplitude Damping Channel to quantum
systems of finite dimension $d$. In the special case of $d=3$, by exploiting
degradability, data-processing inequalities, and channel isomorphism, we
compute the a... | 2008.00477v3 |
2020-08-11 | An inverse spectral problem for a damped wave operator | This paper proposes a new and efficient numerical algorithm for recovering
the damping coefficient from the spectrum of a damped wave operator, which is a
classical Borg-Levinson inverse spectral problem. The algorithm is based on
inverting a sequence of trace formulas, which are deduced by a recursive
formula, bridgin... | 2008.04523v1 |
2020-08-17 | Asymptotic profiles and singular limits for the viscoelastic damped wave equation with memory of type I | In this paper, we are interested in the Cauchy problem for the viscoelastic
damped wave equation with memory of type I. By applying WKB analysis and
Fourier analysis, we explain the memory's influence on dissipative structures
and asymptotic profiles of solutions to the model with weighted $L^1$ initial
data. Furthermo... | 2008.07151v1 |
2020-08-18 | A class of Finite difference Methods for solving inhomogeneous damped wave equations | In this paper, a class of finite difference numerical techniques is presented
to solve the second-order linear inhomogeneous damped wave equation. The
consistency, stability, and convergences of these numerical schemes are
discussed. The results obtained are compared to the exact solution, ordinary
explicit, implicit f... | 2008.08043v2 |
2020-09-10 | Blow-up results for semilinear damped wave equations in Einstein-de Sitter spacetime | We prove by using an iteration argument some blow-up results for a semilinear
damped wave equation in generalized Einstein-de Sitter spacetime with a
time-dependent coefficient for the damping term and power nonlinearity. Then,
we conjecture an expression for the critical exponent due to the main blow-up
results, which... | 2009.05372v1 |
2020-09-11 | Asymptotic profiles for a wave equation with parameter dependent logarithmic damping | We study a nonlocal wave equation with logarithmic damping which is rather
weak in the low frequency zone as compared with frequently studied strong
damping case. We consider the Cauchy problem for this model in the whole space
and we study the asymptotic profile and optimal estimates of the solutions and
the total ene... | 2009.06395v1 |
2020-09-17 | Sensitivity of steady states in a degenerately-damped stochastic Lorenz system | We study stability of solutions for a randomly driven and degenerately damped
version of the Lorenz '63 model. Specifically, we prove that when damping is
absent in one of the temperature components, the system possesses a unique
invariant probability measure if and only if noise acts on the convection
variable. On the... | 2009.08429v1 |
2021-01-23 | Oscillation time and damping coefficients in a nonlinear pendulum | We establish a relationship between the normalized damping coefficients and
the time that takes a nonlinear pendulum to complete one oscillation starting
from an initial position with vanishing velocity. We establish some conditions
on the nonlinear restitution force so that this oscillation time does not
depend monoto... | 2101.09400v2 |
2021-02-20 | Lifespan estimates for semilinear wave equations with space dependent damping and potential | In this work, we investigate the influence of general damping and potential
terms on the blow-up and lifespan estimates for energy solutions to power-type
semilinear wave equations. The space-dependent damping and potential functions
are assumed to be critical or short range, spherically symmetric perturbation.
The blo... | 2102.10257v1 |
2021-02-24 | Attractors for locally damped Bresse systems and a unique continuation property | This paper is devoted to Bresse systems, a robust model for circular beams,
given by a set of three coupled wave equations. The main objective is to
establish the existence of global attractors for dynamics of semilinear
problems with localized damping. In order to deal with localized damping a
unique continuation prop... | 2102.12025v1 |
2021-03-09 | Global weak solution of 3D-NSE with exponential damping | In this paper we prove the global existence of incompressible Navier-Stokes
equations with damping $\alpha (e^{\beta |u|^2}-1)u$, where we use Friedrich
method and some new tools. The delicate problem in the construction of a global
solution, is the passage to the limit in exponential nonlinear term. To solve
this prob... | 2103.05388v1 |
2021-05-03 | Enhanced and unenhanced dampings of Kolmogorov flow | In the present study, Kolmogorov flow represents the stationary sinusoidal
solution $(\sin y,0)$ to a two-dimensional spatially periodic Navier-Stokes
system, driven by an external force. This system admits the additional
non-stationary solution $(\sin y,0)+e^{-\nu t} (\sin y,0)$, which tends
exponentially to the Kolmo... | 2105.00730v2 |
2021-05-06 | On Linear Damping Around Inhomogeneous Stationary States of the Vlasov-HMF Model | We study the dynamics of perturbations around an inhomogeneous stationary
state of the Vlasov-HMF (Hamiltonian Mean-Field) model, satisfying a linearized
stability criterion (Penrose criterion). We consider solutions of the
linearized equation around the steady state, and prove the algebraic decay in
time of the Fourie... | 2105.02484v1 |
2021-05-31 | Blowup of Solutions to a Damped Euler Equation with Homogeneous Three-Point Boundary Condition | It has been established that solutions to the inviscid Proudman-Johnson
equation subject to a homogeneous three-point boundary condition can develop
singularities in finite time. In this paper, we consider the possibility of
singularity formation in solutions of the generalized, inviscid
Proudman-Johnson equation with ... | 2106.00068v1 |
2021-06-16 | Sharp upper and lower bounds of the attractor dimension for 3D damped Euler-Bardina equations | The dependence of the fractal dimension of global attractors for the damped
3D Euler--Bardina equations on the regularization parameter $\alpha>0$ and
Ekman damping coefficient $\gamma>0$ is studied. We present explicit upper
bounds for this dimension for the case of the whole space, periodic boundary
conditions, and t... | 2106.09077v1 |
2021-06-23 | Damping of the Franz-Keldysh oscillations in the presence of disorder | Franz-Keldysh oscillations of the optical absorption in the presence of
short-range disorder are studied theoretically. The magnitude of the effect
depends on the relation between the mean-free path in a zero field and the
distance between the turning points in electric field. Damping of the
Franz-Keldysh oscillations ... | 2106.12691v1 |
2021-06-25 | Perturbed primal-dual dynamics with damping and time scaling coefficients for affine constrained convex optimization problems | In Hilbert space, we propose a family of primal-dual dynamical system for
affine constrained convex optimization problem. Several damping coefficients,
time scaling coefficients, and perturbation terms are thus considered. By
constructing the energy functions, we investigate the convergence rates with
different choices... | 2106.13702v1 |
2021-07-01 | Event-triggering mechanism to damp the linear wave equation | This paper aims at proposing a sufficient matrix inequality condition to
carry out the global exponential stability of the wave equation under an
event-triggering mechanism that updates a damping source term. The damping is
distributed in the whole space but sampled in time. The wellposedness of the
closed-loop event-t... | 2107.00292v1 |
2022-01-28 | Quantum metrology with a non-linear kicked Mach-Zehnder interferometer | We study the sensitivity of a Mach-Zehnder interferometer that contains in
addition to the phase shifter a non-linear element. By including both elements
in a cavity or a loop that the light transverses many times, a non-linear
kicked version of the interferometer arises. We study its sensitivity as
function of the pha... | 2201.12255v1 |
2022-02-27 | The time asymptotic expansion for the compressible Euler equations with time-dependent damping | In this paper, we study the compressible Euler equations with time-dependent
damping $-\frac{1}{(1+t)^{\lambda}}\rho u$. We propose a time asymptotic
expansion around the self-similar solution of the generalized porous media
equation (GPME) and rigorously justify this expansion as $\lambda \in
(\frac17,1)$. In other wo... | 2202.13385v1 |
2022-03-12 | Stability for nonlinear wave motions damped by time-dependent frictions | We are concerned with the dynamical behavior of solutions to semilinear wave
systems with time-varying damping and nonconvex force potential. Our result
shows that the dynamical behavior of solution is asymptotically stable without
any bifurcation and chaos. And it is a sharp condition on the damping
coefficient for th... | 2203.06312v1 |
2022-03-30 | A Toy Model for Damped Water Waves | We consider a toy model for a damped water waves system in a domain $\Omega_t
\subset \mathbb{T} \times \mathbb{R}$. The toy model is based on the
paradifferential water waves equation derived in the work of
Alazard-Burq-Zuily. The form of damping we utilize we utilize is a modified
sponge layer proposed for the three-... | 2203.16645v1 |
2022-05-10 | Global attractor for the weakly damped forced Kawahara equation on the torus | We study the long time behaviour of solutions for the weakly damped forced
Kawahara equation on the torus. More precisely, we prove the existence of a
global attractor in $L^2$, to which as time passes all solutions draw closer.
In fact, we show that the global attractor turns out to lie in a smoother space
$H^2$ and b... | 2205.04642v1 |
2022-06-07 | Decay property of solutions to the wave equation with space-dependent damping, absorbing nonlinearity, and polynomially decaying data | We study the large time behavior of solutions to the semilinear wave equation
with space-dependent damping and absorbing nonlinearity in the whole space or
exterior domains. Our result shows how the amplitude of the damping
coefficient, the power of the nonlinearity, and the decay rate of the initial
data at the spatia... | 2206.03218v2 |
2022-10-24 | The time asymptotic expansion for the compressible Euler equations with damping | In 1992, Hsiao and Liu \cite{Hsiao-Liu-1} firstly showed that the solution to
the compressible Euler equations with damping time-asymptotically converges to
the diffusion wave $(\bar v, \bar u)$ of the porous media equation. In
\cite{Geng-Huang-Jin-Wu}, we proposed a time-asymptotic expansion around the
diffusion wave ... | 2210.13157v1 |
2022-12-18 | Exponential decay of solutions of damped wave equations in one dimensional space in the $L^p$ framework for various boundary conditions | We establish the decay of the solutions of the damped wave equations in one
dimensional space for the Dirichlet, Neumann, and dynamic boundary conditions
where the damping coefficient is a function of space and time. The analysis is
based on the study of the corresponding hyperbolic systems associated with the
Riemann ... | 2212.09164v1 |
2023-02-09 | A remark on the logarithmic decay of the damped wave and Schrödinger equations on a compact Riemannian manifold | In this paper we consider a compact Riemannian manifold (M, g) of class C 1
$\cap$ W 2,$\infty$ and the damped wave or Schr\"odinger equations on M , under
the action of a damping function a = a(x). We establish the following fact: if
the measure of the set {x $\in$ M ; a(x) = 0} is strictly positive, then the
decay in... | 2302.04498v1 |
2023-03-02 | Using vibrating wire in non-linear regime as a thermometer in superfluid $^3$He-B | Vibrating wires are common temperature probes in $^3$He experiments. By
measuring mechanical resonance of a wire driven by AC current in magnetic field
one can directly obtain temperature-dependent viscous damping. This is easy to
do in a linear regime where wire velocity is small enough and damping force is
proportion... | 2303.01189v1 |
2023-04-06 | A turbulent study for a damped Navier-Stokes equation: turbulence and problems | In this article we consider a damped version of the incompressible
Navier-Stokes equations in the whole three-dimensional space with a
divergence-free and time-independent external force. Within the framework of a
well-prepared force and with a particular choice of the damping parameter, when
the Grashof numbers are la... | 2304.03134v1 |
2023-05-03 | Lyapunov functions for linear damped wave equations in one-dimensional space with dynamic boundary conditions | We establish the exponential decay of the solutions of the damped wave
equations in one-dimensional space where the damping coefficient is a
nowhere-vanishing function of space. The considered PDE is associated with
several dynamic boundary conditions, also referred to as Wentzell/Ventzel
boundary conditions in the lit... | 2305.01969v2 |
2023-05-13 | Global existence for a 3D Tropical Climate Model with damping and small initial data in $\dot H^{1/2}(\mathbb{R}^3)$ | We consider a 3D Tropical Climate Model with damping terms in the equation of
the barotropic mode $u$ and in the equation of the first baroclinic mode $v$ of
the velocity. The equation for the temperature $\theta$ is free from dampings.
We prove global existence in time for this system assuming the initial data
$(u_0, ... | 2305.07964v1 |
2023-06-21 | The effect of singularities and damping on the spectra of photonic crystals | Understanding the dispersive properties of photonic crystals is a fundamental
and well-studied problem. However, the introduction of singular permittivities
and damping complicates the otherwise straightforward theory. In this paper, we
study photonic crystals with a Drude-Lorentz model for the permittivity,
motivated ... | 2306.12254v1 |
2023-07-12 | Asymptotic behavior of solutions to the Cauchy problem for 1-D p-system with space dependent damping | We consider the Cauchy problem for one-dimensional p-system with damping of
space-dependent coefficient. This system models the compressible flow through
porous media in the Lagrangean coordinate. Our concern is an asymptotic
behavior of solutions, which is expected to be the diffusion wave based on the
Darcy law. To s... | 2307.05865v1 |
2023-07-12 | Parabolic-elliptic Keller-Segel's system | We study on the whole space R d the compressible Euler system with damping
coupled to the Poisson equation when the damping coefficient tends towards
infinity. We first prove a result of global existence for the Euler-Poisson
system in the case where the damping is large enough, then, in a second step,
we rigorously ju... | 2307.05981v1 |
2023-07-25 | Asymptotic behavior and life-span estimates for the damped inhomogeneous nonlinear Schrödinger equation | We are interested in the behavior of solutions to the damped inhomogeneous
nonlinear Schr\"odinger equation $ i\partial_tu+\Delta
u+\mu|x|^{-b}|u|^{\alpha}u+iau=0$, $\mu \in\mathbb{C} $, $b>0$, $a \in
\mathbb{C}$ such that $\Re \textit{e}(a) \geq 0$, $\alpha>0$. We establish
lower and upper bound estimates of the life-... | 2307.13495v1 |
2023-07-26 | On nonlinear Landau damping and Gevrey regularity | In this article we study the problem of nonlinear Landau damping for the
Vlasov-Poisson equations on the torus. As our main result we show that for
perturbations initially of size $\epsilon>0$ and time intervals
$(0,\epsilon^{-N})$ one obtains nonlinear stability in regularity classes
larger than Gevrey $3$, uniformly ... | 2307.14271v1 |
2023-08-18 | Damping for fractional wave equations and applications to water waves | Motivated by numerically modeling surface waves for inviscid Euler equations,
we analyze linear models for damped water waves and establish decay properties
for the energy for sufficiently regular initial configurations. Our findings
give the explicit decay rates for the energy, but do not address
reflection/transmissi... | 2308.09288v1 |
2023-08-30 | Optimal decay for one-dimensional damped wave equations with potentials via a variant of Nash inequality | The optimality of decay properties of the one-dimensional damped wave
equations with potentials belonging to a certain class is discussed. The
typical ingredient is a variant of Nash inequality which involves an invariant
measure for the corresponding Schr\"odinger semigroup. This enables us to find
a sharp decay estim... | 2308.15680v1 |
2023-09-15 | Explicit solutions and linear inviscid damping in the Euler-Boussinesq equation near a stratified Couette flow in the periodic strip | This short note provides explicit solutions to the linearized Boussinesq
equations around the stably stratified Couette flow posed on
$\mathbb{T}\times\mathbb{R}$. We consider the long-time behavior of such
solutions and prove inviscid damping of the perturbed density and velocity
field for any positive Richardson numb... | 2309.08419v2 |
2023-09-21 | Beyond Qubits : An Extensive Noise Analysis for Qutrit Quantum Teleportation | The four quantum noises Bit Flip, Phase Flip, Depolarization, and Amplitude
Damping as well as any potential combinations of them are examined in this
papers investigation of quantum teleportation using qutrit states. Among the
above mentioned noises, we observed phase flip has highest fidelity. Compared
to uncorrelate... | 2309.12163v1 |
2023-12-22 | Soliton resolution for the energy critical damped wave equations in the radial case | We consider energy-critical damped wave equation \begin{equation*}
\partial_{tt}u-\Delta u+\alpha \partial_t u=\left|u\right|^{\frac{4}{D-2}}u
\end{equation*} with radial initial data in dimensions $D\geq 4$. The equation
has a nontrivial radial stationary solution $W$, called the ground state, which
is unique up to si... | 2401.04115v2 |
2024-02-18 | Sharp lifespan estimate for the compressible Euler system with critical time-dependent damping in $\R^2$ | This paper concerns the long time existence to the smooth solutions of the
compressible Euler system with critical time dependent damping in $\R^2$. We
establish the sharp lifespan estimate from below, with respect to the small
parameter of the initial perturbation. For this end, the vector fields
$\widehat{Z}$ (define... | 2402.11516v1 |
2024-02-28 | Linear inviscid damping in the presence of an embedding eigenvalue | In this paper, we investigate the long-time dynamics of the linearized 2-D
Euler equations around a hyperbolic tangent flow $(\tanh y,0)$. A key
difference compared to previous results is that the linearized operator has an
embedding eigenvalue, which has a significant impact on the dynamics of the
linearized system. F... | 2402.18229v1 |
2024-03-19 | Improved decay results for micropolar flows with nonlinear damping | We examine the long-time behavior of solutions (and their derivatives) to the
micropolar equations with nonlinear velocity damping. Additionally, we get a
speed-up gain of $ t^{1/2} $ for the angular velocity, consistent with
established findings for classic micropolar flows lacking nonlinear damping.
Consequently, we ... | 2403.12885v1 |
2024-03-26 | On a class of nonautonomous quasilinear systems with general time-gradually-degenerate damping | In this paper, we study two systems with a time-variable coefficient and
general time-gradually-degenerate damping. More explicitly, we construct the
Riemann solutions to the time-variable coefficient Zeldovich approximation and
time-variable coefficient pressureless gas systems both with general
time-gradually-degener... | 2403.17732v1 |
1994-05-02 | Damped Lyman Alpha Systems vs. Cold + Hot Dark Matter | Although the Cold + Hot Dark Matter (CHDM) cosmology provides perhaps the
best fit of any model to all the available data at the current epoch, CHDM
produces structure at relatively low redshifts and thus could be ruled out if
there were evidence for formation of massive objects at high redshifts. Damped
Ly$\alpha$ sys... | 9405003v1 |
1995-03-24 | High Redshift Lyman Limit and Damped Lyman-Alpha Absorbers | We have obtained high signal:to:noise optical spectroscopy at 5\AA\
resolution of 27 quasars from the APM z$>$4 quasar survey. The spectra have
been analyzed to create new samples of high redshift Lyman-limit and damped
Lyman-$\alpha$ absorbers. These data have been combined with published data
sets in a study of the r... | 9503089v1 |
1997-05-15 | Cosmological Constraints from High-Redshift Damped Lyman-Alpha Systems | Any viable cosmological model must produce enough structure at early epochs
to explain the amount of gas associated with high-redshift damped Ly$\alpha$
systems. We study the evolution of damped Ly$\alpha$ systems at redshifts $z\ge
2$ in cold dark matter (CDM) and cold+hot dark matter (CDM+HDM) models using
both N-bod... | 9705113v1 |
2001-01-03 | Galactic Chemical Abundances at z>3 I: First Results from the Echellette Spectrograph and Imager | We present the first results from an ongoing survey to discover and measure
the metallicity of z>3 damped Lya systems with the Echellette Spectrograph and
Imager (ESI) on the Keck II telescope. Our motivation arises from a recent
study on the damped Lya systems suggesting only mild evolution in the cosmic
metallicity f... | 0101029v1 |
2002-01-17 | Self-shielding Effects on the Column Density Distribution of Damped Lyman Alpha Systems | We calculate the column density distribution of damped Lyman alpha systems,
modeled as spherical isothermal gaseous halos ionized by the external cosmic
background. The effects of self-shielding introduce a hump in this
distribution, at a column density N_{HI} \sim 1.6x10^{17} X^{-1} cm^{-2}, where
X is the neutral fra... | 0201275v2 |
2002-04-30 | Two-phase equilibrium and molecular hydrogen formation in damped Lyman-alpha systems | Molecular hydrogen is quite underabundant in damped Lyman-alpha systems at
high redshift, when compared to the interstellar medium near the Sun. This has
been interpreted as implying that the gas in damped Lyman-alpha systems is
warm. like the nearby neutral intercloud medium, rather than cool, as in the
clouds which g... | 0204515v1 |
2003-05-12 | Ordinary and Viscosity-Damped MHD Turbulence | We compare the properties of ordinary strong magnetohydrodynamic (MHD)
turbulence in a strongly magnetized medium with the recently discovered
viscosity-damped regime. We focus on energy spectra, anisotropy, and
intermittency. Our most surprising conclusion is that in ordinary strong MHD
turbulence the velocity and mag... | 0305212v2 |
2003-09-17 | Observational Tests of Damping by Resonant Absorption in Coronal Loop Oscillations | One of the proposed damping mechanisms of coronal (transverse) loop
oscillations in the kink-mode is resonant absorption as a result of the Alfven
speed variation at the outer boundary of coronal loops. Analytical expressions
for the period and damping time exist for loop models with thin non-uniform
boundaries. Here w... | 0309470v1 |
2005-03-01 | Metal Abundances in a Damped Lyman-alpha System Along Two Lines of Sight at z=0.93 | We study metal abundances in the z=0.9313 damped Lya system observed in the
two lines-of-sight, A and B, toward the gravitationally-lensed double QSO
HE0512-3329. Spatially resolved STIS spectra constrain the neutral-gas column
density to be LogN(HI)=20.5 in both Aand B. UVES spectra (spectral resolution
FWHM=9.8 km/s)... | 0503026v1 |
2000-08-26 | Adsorbate aggregation and relaxation of low-frequency vibrations | We present a study of resonant vibrational coupling between adsorbates and an
elastic substrate at low macroscopic coverages. In the first part of the paper
we consider the situation when adsorbates form aggregates with high local
coverage. Based upon our previously published theory, we derive formulas
describing the d... | 0008389v1 |
2004-10-26 | Mean-field treatment of the damping of the oscillations of a 1D Bose gas in an optical lattice | We present a theoretical treatment of the surprisingly large damping observed
recently in one-dimensional Bose-Einstein atomic condensates in optical
lattices. We show that time-dependent Hartree-Fock-Bogoliubov (HFB)
calculations can describe qualitatively the main features of the damping
observed over a range of latt... | 0410677v4 |
1998-10-16 | Fermion Damping in a Fermion-Scalar Plasma | In this article we study the dynamics of fermions in a fermion-scalar plasma.
We begin by obtaining the effective in-medium Dirac equation in real time which
is fully renormalized and causal and leads to the initial value problem. For a
heavy scalar we find the novel result that the decay of the scalar into fermion
pai... | 9810393v2 |
2006-01-06 | Wave energy localization by self-focusing in large molecular structures: a damped stochastic discrete nonlinear Schroedinger equation model | Wave self-focusing in molecular systems subject to thermal effects, such as
thin molecular films and long biomolecules, can be modeled by stochastic
versions of the Discrete Self-Trapping equation of Eilbeck, Lomdahl and Scott,
and this can be approximated by continuum limits in the form of stochastic
nonlinear Schroed... | 0601017v1 |
2007-11-15 | Effect of the steady flow on spatial damping of small-amplitude prominence oscillations | Aims. Taking account of steady flow in solar prominences, we study its
effects on spatial damping of small-amplitude non-adiabatic magnetoacoustic
waves in a homogeneous, isothermal, and unbounded prominence plasma. Methods.
We model the typical feature of observed damped oscillatory motion in
prominences, removing the... | 0711.2353v1 |
2008-02-07 | Cascade and Damping of Alfvén-Cyclotron Fluctuations: Application to Solar Wind Turbulence Spectrum | With the diffusion approximation, we study the cascade and damping of
Alfv\'{e}n-cyclotron fluctuations in solar plasmas numerically. Motivated by
wave-wave couplings and nonlinear effects, we test several forms of the
diffusion tensor. For a general locally anisotropic and inhomogeneous diffusion
tensor in the wave ve... | 0802.0910v1 |
2011-04-13 | Evolution of inclined planets in three-dimensional radiative discs | While planets in the solar system only have a low inclination with respect to
the ecliptic there is mounting evidence that in extrasolar systems the
inclination can be very high, at least for close-in planets. One process to
alter the inclination of a planet is through planet-disc interactions. Recent
simulations consi... | 1104.2408v1 |
2011-07-12 | Mode conversion of radiatively damped magnetogravity waves in the solar chromosphere | Modelling of adiabatic gravity wave propagation in the solar atmosphere
showed that mode conversion to field guided acoustic waves or Alfv\'en waves
was possible in the presence of highly inclined magnetic fields. This work aims
to extend the previous adiabatic study, exploring the consequences of radiative
damping on ... | 1107.2208v1 |
2013-09-23 | Phonon-mediated damping of mechanical vibrations in a finite atomic chain coupled to an outer environment | We study phonon-mediated damping of mechanical vibrations in a finite
quantum-mechanical atomic-chain model. Our study is motivated by the quest to
understand the quality factors (Q) of nanomechanical resonators and
nanoelectromechanical systems (NEMS), as well as actual experiments with
suspended atomic chains and mol... | 1309.5772v1 |
2014-04-01 | Stellar dynamics in gas: The role of gas damping | In this paper, we consider how gas damping affects the dynamical evolution of
gas-embedded star clusters. Using a simple three-component (i.e. one gas and
two stellar components) model, we compare the rates of mass segregation due to
two-body relaxation, accretion from the interstellar medium, and gas dynamical
frictio... | 1404.0379v1 |
2014-04-26 | Landau damping effects on dust-acoustic solitary waves in a dusty negative-ion plasma | The nonlinear theory of dust-acoustic waves (DAWs) with Landau damping is
studied in an unmagnetized dusty negative-ion plasma in the extreme conditions
when the free electrons are absent. The cold massive charged dusts are
described by fluid equations, whereas the two-species of ions (positive and
negative) are descri... | 1404.6623v3 |
2015-03-31 | Damping of Confined Excitations Modes of 1D Condensates in an Optical Lattice | We study the damping of the collective excitations of Bose-Einstein
condensates in a harmonic trap potential loaded in an optical lattice. In the
presence of a confining potential the system is non-homogeneous and the
collective excitations are characterized by a set of discrete confined
phonon-like excitations. We der... | 1503.08884v2 |
2015-08-06 | On the spatial scales of wave heating in the solar chromosphere | Dissipation of magnetohydrodynamic (MHD) wave energy has been proposed as a
viable heating mechanism in the solar chromospheric plasma. Here, we use a
simplified one-dimensional model of the chromosphere to theoretically
investigate the physical processes and the spatial scales that are required for
the efficient dissi... | 1508.01497v1 |
2015-11-11 | A statistical study of decaying kink oscillations detected using SDO/AIA | Despite intensive studies of kink oscillations of coronal loops in the last
decade, a large scale statistically significant investigation of the
oscillation parameters has not been made using data from the Solar Dynamics
Observatory (SDO).
We carry out a statistical study of kink oscillations using Extreme
Ultra-Viol... | 1511.03558v1 |
2016-03-01 | A comparative study of protocols for secure quantum communication under noisy environment: single-qubit-based protocols versus entangled-state-based protocols | The effect of noise on various protocols of secure quantum communication has
been studied. Specifically, we have investigated the effect of amplitude
damping, phase damping, squeezed generalized amplitude damping, Pauli type as
well as various collective noise models on the protocols of quantum key
distribution, quantu... | 1603.00178v1 |
2016-11-17 | A stable partitioned FSI algorithm for rigid bodies and incompressible flow. Part I: Model problem analysis | A stable partitioned algorithm is developed for fluid-structure interaction
(FSI) problems involving viscous incompressible flow and rigid bodies. This
{\em added-mass partitioned} (AMP) algorithm remains stable, without
sub-iterations, for light and even zero mass rigid bodies when added-mass and
viscous added-damping... | 1611.05711v1 |
2017-01-30 | Torsional Alfvén resonances as an efficient damping mechanism for non-radial oscillations in red giant stars | Stars are self-gravitating fluids in which pressure, buoyancy, rotation and
magnetic fields provide the restoring forces for global modes of oscillation.
Pressure and buoyancy energetically dominate, while rotation and magnetism are
generally assumed to be weak perturbations and often ignored. However,
observations of ... | 1701.08771v1 |
2018-03-30 | Damping of gravitational waves in a viscous Universe and its implication for dark matter self-interactions | It is well known that a gravitational wave (GW) experiences the damping
effect when it propagates in a fluid with nonzero shear viscosity. In this
paper, we propose a new method to constrain the GW damping rate and thus the
fluid shear viscosity. By defining the effective distance which incorporates
damping effects, we... | 1803.11397v1 |
2018-05-29 | Basic microscopic plasma physics from N-body mechanics | Computing is not understanding. This is exemplified by the multiple and
discordant interpretations of Landau damping still present after seventy years.
For long deemed impossible, the mechanical N-body description of this damping,
not only enables its rigorous and simple calculation, but makes unequivocal and
intuitive... | 1805.11408v2 |
2018-08-22 | Constructing a boosted, spinning black hole in the damped harmonic gauge | The damped harmonic gauge is important for numerical relativity computations
based on the generalized harmonic formulation of Einstein's equations, and is
used to reduce coordinate distortions near binary black hole mergers. However,
currently there is no prescription to construct quasiequilibrium binary black
hole ini... | 1808.07490v3 |
2018-12-13 | Neutrino damping in a fermion and scalar background | We consider the propagation of a neutrino in a background composed of a
scalar particle and a fermion using a simple model for the coupling of the form
$\lambda\bar f_R\nu_L\phi$. In the presence of these interactions there can be
damping terms in the neutrino effective potential and index of refraction. We
calculate t... | 1812.05672v2 |
2019-04-25 | High Spin-Wave Propagation Length Consistent with Low Damping in a Metallic Ferromagnet | We report ultra-low intrinsic magnetic damping in
Co$_{\text{25}}$Fe$_{\text{75}}$ heterostructures, reaching the low $10^{-4}$
regime at room temperature. By using a broadband ferromagnetic resonance
technique, we extracted the dynamic magnetic properties of several
Co$_{\text{25}}$Fe$_{\text{75}}$-based heterostructu... | 1904.11321v3 |
2019-11-02 | Soft contribution to the damping rate of a hard photon in a weakly magnetized hot medium | We consider weakly magnetized hot QED plasma comprising electrons and
positrons. There are three distinct dispersive (longitudinal and two
transverse) modes of a photon in a thermo-magnetic medium. At lowest order in
coupling constant, photon is damped in this medium via Compton scattering and
pair creation process. We... | 1911.00744v2 |
2020-09-25 | Temperature dependence of the damping parameter in the ferrimagnet Gd$_3$Fe$_5$O$_{12}$ | The damping parameter ${\alpha}_{\text{FM}}$ in ferrimagnets defined
according to the conventional practice for ferromagnets is known to be strongly
temperature dependent and diverge at the angular momentum compensation
temperature, where the net angular momentum vanishes. However, recent
theoretical and experimental d... | 2009.12073v2 |
2020-09-25 | A Complex Stiffness Human Impedance Model with Customizable Exoskeleton Control | The natural impedance, or dynamic relationship between force and motion, of a
human operator can determine the stability of exoskeletons that use
interaction-torque feedback to amplify human strength. While human impedance is
typically modelled as a linear system, our experiments on a single-joint
exoskeleton testbed i... | 2009.12446v1 |
2020-11-26 | On the stabilization of breather-type solutions of the damped higher order nonlinear Schrödinger equation | Spatially periodic breather solutions (SPBs) of the nonlinear Schr\"o\-dinger
(NLS) equation are frequently used to model rogue waves and are typically
unstable. In this paper we study the effects of dissipation and higher order
nonlinearities on the stabilization of both single and multi-mode SPBs in the
framework of ... | 2011.13334v1 |
2020-12-22 | Comparison of local and global gyrokinetic calculations of collisionless zonal flow damping in quasi-symmetric stellarators | The linear collisionless damping of zonal flows is calculated for
quasi-symmetric stellarator equilibria in flux-tube, flux-surface, and
full-volume geometry. Equilibria are studied from the quasi-helical symmetry
configuration of the Helically Symmetric eXperiment (HSX), a broken symmetry
configuration of HSX, and the... | 2012.12213v2 |
2020-12-31 | Damping of slow surface kink modes in solar photospheric waveguides modeled by one-dimensional inhomogeneities | Given the recent interest in magnetohydrodynamic (MHD) waves in pores and
sunspot umbrae, we examine the damping of slow surface kink modes (SSKMs) by
modeling solar photospheric waveguides with a cylindrical inhomogeneity
comprising a uniform interior, a uniform exterior, and a continuous transition
layer (TL) in betw... | 2012.15426v1 |
2021-02-24 | Finding the mechanism of wave energy flux damping in solar pores using numerical simulations | Context. Solar magnetic pores are, due to their concentrated magnetic fields,
suitable guides for magnetoacoustic waves. Recent observations have shown that
propagating energy flux in pores is subject to strong damping with height;
however, the reason is still unclear. Aims. We investigate possible damping
mechanisms n... | 2102.12420v1 |
2022-04-08 | Damped Strichartz estimates and the incompressible Euler--Maxwell system | Euler--Maxwell systems describe the dynamics of inviscid plasmas. In this
work, we consider an incompressible two-dimensional version of such systems and
prove the existence and uniqueness of global weak solutions, uniformly with
respect to the speed of light $c\in (c_0,\infty)$, for some threshold value
$c_0>0$ depend... | 2204.04277v3 |
2022-05-11 | A new look at the frequency-dependent damping of slow-mode waves in the solar corona | Being directly observed in the Doppler shift and imaging data and indirectly
as quasi-periodic pulsations in solar and stellar flares, slow magnetoacoustic
waves offer an important seismological tool for probing many vital parameters
of the coronal plasma. A recently understood active nature of the solar corona
for mag... | 2205.05346v1 |
2022-12-13 | The Effect of Internal Damping on Locomotion in Frictional Environments | The gaits of undulating animals arise from a complex interaction of their
central nervous system, muscle, connective tissue, bone, and environment. As a
simplifying assumption, many previous studies have often assumed that
sufficient internal force is available to produce observed kinematics, thus not
focusing on quant... | 2212.06290v1 |
2023-01-19 | Inverse Problems of Identifying the Unknown Transverse Shear Force in the Euler-Bernoulli Beam with Kelvin-Voigt Damping | In this paper, we study the inverse problems of determining the unknown
transverse shear force $g(t)$ in a system governed by the damped
Euler-Bernoulli equation $\rho(x)u_{tt}+\mu(x)u_t+ (r(x)u_{xx})_{xx}+
(\kappa(x)u_{xxt})_{xx}=0, ~(x,t)\in (0,\ell)\times(0,T],$ subject to the
boundary conditions $u(0,t) =0$, $u_{x}... | 2301.07931v1 |
2023-03-28 | Escape Kinetics of an Underdamped Colloidal Particle from a Cavity through Narrow Pores | It is often desirable to know the controlling mechanism of survival
probability of nano - or microscale particles in small cavities such as, e.g.,
confined submicron particles in fiber beds of high-efficiency filter media or
ions/small molecules in confined cellular structures. Here we address this
issue based on numer... | 2303.16092v1 |
2023-06-05 | Damping of coronal oscillations in self-consistent 3D radiative MHD simulations of the solar atmosphere | Oscillations are abundant in the solar corona. Coronal loop oscillations are
typically studied using highly idealised models of magnetic flux tubes. In
order to improve our understanding of coronal oscillations, it is necessary to
consider the effect of realistic magnetic field topology and density
structuring. We anal... | 2306.02770v1 |
2023-08-22 | Investigating the characteristic shape and scatter of intergalactic damping wings during reionization | Ly$\alpha$ damping wings in the spectra of bright objects at high redshift
are a useful probe of the ionization state of the intergalactic medium during
the reionization epoch. It has recently been noted that, despite the
inhomogeneous nature of reionization, these damping wings have a characteristic
shape which is a s... | 2308.11709v1 |
2023-10-02 | Characterizing the Velocity-Space Signature of Electron Landau Damping | Plasma turbulence plays a critical role in the transport of energy from
large-scale magnetic fields and plasma flows to small scales, where the
dissipated turbulent energy ultimately leads to heating of the plasma species.
A major goal of the broader heliophysics community is to identify the physical
mechanisms respons... | 2310.01242v2 |
2023-10-07 | OEDG: Oscillation-eliminating discontinuous Galerkin method for hyperbolic conservation laws | Controlling spurious oscillations is crucial for designing reliable numerical
schemes for hyperbolic conservation laws. This paper proposes a novel, robust,
and efficient oscillation-eliminating discontinuous Galerkin (OEDG) method on
general meshes, motivated by the damping technique in [Lu, Liu, and Shu, SIAM
J. Nume... | 2310.04807v1 |
2023-12-07 | Probing levitodynamics with multi-stochastic forces and the simple applications on the dark matter detection in optical levitation experiment | If the terrestrial environment is permeated by dark matter, the levitation
experiences damping forces and fluctuations attributed to dark matter. This
paper investigates levitodynamics with multiple stochastic forces, including
thermal drag, photon recoil, feedback, etc., assuming that all of these forces
adhere to the... | 2312.04202v2 |
2024-01-23 | Damped kink motions in a system of two solar coronal tubes with elliptic cross-sections | This study is motivated by observations of coordinated transverse
displacements in neighboring solar active region loops, addressing specifically
how the behavior of kink motions in straight two-tube equilibria is impacted by
tube interactions and tube cross-sectional shapes.We work with linear, ideal,
pressureless mag... | 2401.12885v2 |
1995-02-08 | The Chemical Evolution of Damped Lyman Alpha Galaxies | Measurements of element abundances in damped Lyman alpha systems are
providing new means to investigate the chemical evolution of galaxies,
particularly at early times. We review progress in this area, concentrating on
recent efforts to extend the range of existing surveys to both higher and lower
redshifts. | 9502047v1 |
1996-01-19 | The Chemical Enrichment History of Damped Lyman-alpha Galaxies | Studies of damped Lyman-alpha absorption systems in quasar spectra are
yielding very interesting results regarding the chemical evolution of these
galaxies. We present some preliminary results from such a program. | 9601098v1 |
1997-01-30 | Initial Chemical Enrichment in Galaxies | We present evidence that damped Lyman-alpha galaxies detected in spectra of
quasars may not have started forming stars until the redshift z~3. If damped
Lyman-alpha absorbers are the progenitors of disk galaxies, then the above
result may indicate that star formation in galactic disks first began at z~3. | 9701241v1 |
1997-10-24 | The N/Si Abundance Ratio in Fifteen Damped Lyman-alpha Galaxies: Implications for the Origin of Nitrogen | Galactic chemical evolution model calculations indicate that there should be
considerable scatter in the observed N/O ratios at a fixed metallicity (O/H)
for galaxies with very low metallicities due to the delayed release of primary
N from intermediate mass stars relative to that of O from short-lived massive
stars. Mo... | 9710266v2 |
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