publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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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 |
2021-09-03 | 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 |
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 |
2022-03-02 | 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 |
2022-06-17 | Resolvent estimates for the one-dimensional damped wave equation with unbounded damping | We study the generator $G$ of the one-dimensional damped wave equation with
unbounded damping. We show that the norm of the corresponding resolvent
operator, $\| (G - \lambda)^{-1} \|$, is approximately constant as $|\lambda|
\to +\infty$ on vertical strips of bounded width contained in the closure of
the left-hand sid... | 2206.08820v2 |
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 |
2022-10-14 | 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 |
2022-11-16 | Controlling the motional quality factor of a diamagnetically levitated graphite plate | Researchers seek methods to levitate matter for a wide variety of purposes,
ranging from exploring fundamental problems in science, through to developing
new sensors and mechanical actuators. Many levitation techniques require active
driving and most can only be applied to objects smaller than a few micrometers.
Diamag... | 2211.08764v1 |
2022-12-03 | Strong On-Chip Microwave Photon-Magnon Coupling Using Ultra-low Damping Epitaxial Y3Fe5O12 Films at 2 Kelvin | Y3Fe5O12 is arguably the best magnetic material for magnonic quantum
information science (QIS) because of its extremely low damping. We report
ultralow damping at 2 K in epitaxial Y3Fe5O12 thin films grown on a diamagnetic
Y3Sc2Ga3O12 substrate that contains no rare-earth elements. Using these
ultralow damping YIG film... | 2212.01708v1 |
2022-12-21 | Fractional damping effects on the transient dynamics of the Duffing oscillator | We consider the nonlinear Duffing oscillator in presence of fractional
damping which is characteristic in different physical situations. The system is
studied with a smaller and larger damping parameter value, that we call the
underdamped and overdamped regimes. In both we have studied the relation
between the fraction... | 2212.11023v1 |
2023-01-19 | Damped harmonic oscillator revisited: the fastest route to equilibrium | Theoretically, solutions of the damped harmonic oscillator asymptotically
approach equilibrium, i.e., the zero energy state, without ever reaching it
exactly, and the critically damped solution approaches equilibrium faster than
the underdamped or the overdamped solution. Experimentally, the systems
described with this... | 2301.08222v2 |
2023-01-22 | Boundary stabilization of a vibrating string with variable length | We study small vibrations of a string with time-dependent length $\ell(t)$
and boundary damping. The vibrations are described by a 1-d wave equation in an
interval with one moving endpoint at a speed $\ell'(t)$ slower than the speed
of propagation of the wave c=1. With no damping, the energy of the solution
decays if t... | 2301.09086v1 |
2023-02-24 | Asymptotic behaviour of the semidiscrete FE approximations to weakly damped wave equations with minimal smoothness on initial data | Exponential decay estimates of a general linear weakly damped wave equation
are studied with decay rate lying in a range. Based on the $C^0$-conforming
finite element method to discretize spatial variables keeping temporal variable
continuous, a semidiscrete system is analysed, and uniform decay estimates are
derived w... | 2302.12476v1 |
2023-02-27 | Nonlinear acoustic imaging with damping | In this paper, we consider an inverse problem for a nonlinear wave equation
with a damping term and a general nonlinear term. This problem arises in
nonlinear acoustic imaging and has applications in medical imaging and other
fields. The propagation of ultrasound waves can be modeled by a quasilinear
wave equation with... | 2302.14174v1 |
2023-04-11 | Sizable suppression of magnon Hall effect by magnon damping in Cr$_2$Ge$_2$Te$_6$ | Two-dimensional (2D) Heisenberg honeycomb ferromagnets are expected to have
interesting topological magnon effects as their magnon dispersion can have
Dirac points. The Dirac points are gapped with finite second nearest neighbor
Dzyaloshinskii-Moriya interaction, providing nontrivial Berry curvature with
finite magnon ... | 2304.04922v1 |
2023-05-22 | Semi-active damping optimization of vibrational systems using the reduced basis method | In this article, we consider vibrational systems with semi-active damping
that are described by a second-order model. In order to minimize the influence
of external inputs to the system response, we are optimizing some damping
values. As minimization criterion, we evaluate the energy response, that is the
$\cH_2$-norm ... | 2305.12946v1 |
2023-06-01 | A combined volume penalization / selective frequency damping approach for immersed boundary methods: application to moving geometries | This work extends, to moving geometries, the immersed boundary method based
on volume penalization and selective frequency damping approach [J. Kou, E.
Ferrer, A combined volume penalization/selective frequency damping approach for
immersed boundary methods applied to high-order schemes, Journal of
Computational Physic... | 2306.00504v1 |
2023-06-09 | Damped nonlinear Schrödinger equation with Stark effect | We study the $L^2$-critical damped NLS with a Stark potential. We prove that
the threshold for global existence and finite time blowup of this equation is
given by $\|Q\|_2$, where $Q$ is the unique positive radial solution of $\Delta
Q + |Q|^{4/d} Q = Q$ in $H^1(\mathbb{R}^d)$. Moreover, in any small
neighborhood of $... | 2306.05931v1 |
2023-06-19 | New Perspectives and Systematic Approaches for Analyzing Negative Damping-Induced Sustained Oscillation | Sustained oscillations (SOs) are commonly observed in systems dominated by
converters. Under specific conditions, even though the origin of SOs can be
identified through negative damping modes using conventional linear analysis,
utilizing the describing function to compute harmonic amplitude and frequency
remains incom... | 2306.10839v2 |
2023-06-24 | Numerical approximation of the invariant distribution for a class of stochastic damped wave equations | We study a class of stochastic semilinear damped wave equations driven by
additive Wiener noise. Owing to the damping term, under appropriate conditions
on the nonlinearity, the solution admits a unique invariant distribution. We
apply semi-discrete and fully-discrete methods in order to approximate this
invariant dist... | 2306.13998v1 |
2023-07-31 | Estimation of Power in the Controlled Quantum Teleportation through the Witness Operator | Controlled quantum teleportation (CQT) can be considered as a variant of
quantum teleportation in which three parties are involved where one party acts
as the controller. The usability of the CQT scheme depends on two types of
fidelities viz. conditioned fidelity and non-conditioned fidelity. The
difference between the... | 2307.16574v1 |
2023-08-03 | Triple-Spherical Bessel Function Integrals with Exponential and Gaussian Damping: Towards an Analytic N-Point Correlation Function Covariance Model | Spherical Bessel functions appear commonly in many areas of physics wherein
there is both translation and rotation invariance, and often integrals over
products of several arise. Thus, analytic evaluation of such integrals with
different weighting functions (which appear as toy models of a given physical
observable, su... | 2308.01955v2 |
2023-08-28 | Quantized damped transversal single particle mechanical waves | In information transfer, the dissipation of a signal may have crucial
importance. The feasibility of reconstructing the distorted signal also depends
on this. That is why the study of quantized dissipative transversal single
particle mechanical waves may have an important role. It may be true,
particularly on the nanos... | 2308.14820v1 |
2023-11-15 | Integrated Local Energy Decay for Damped Magnetic Wave Equations on Stationary Space-Times | We establish local energy decay for damped magnetic wave equations on
stationary, asymptotically flat space-times subject to the geometric control
condition. More specifically, we allow for the addition of time-independent
magnetic and scalar potentials, which negatively affect energy coercivity and
may add in unwieldy... | 2311.08628v1 |
2023-11-15 | Applications of $L^p-L^q$ estimates for solutions to semi-linear $σ$-evolution equations with general double damping | In this paper, we would like to study the linear Cauchy problems for
semi-linear $\sigma$-evolution models with mixing a parabolic like damping term
corresponding to $\sigma_1 \in [0,\sigma/2)$ and a $\sigma$-evolution like
damping corresponding to $\sigma_2 \in (\sigma/2,\sigma]$. The main goals are
on the one hand to... | 2311.09085v1 |
2023-12-07 | Generalized Damping Torque Analysis of Ultra-Low Frequency Oscillation in the Jerk Space | Ultra low frequency oscillation (ULFO) is significantly threatening the power
system stability. Its unstable mechanism is mostly studied via generalized
damping torque analysis method (GDTA). However, the analysis still adopts the
framework established for low frequency oscillation. Hence, this letter
proposes a GDTA a... | 2312.04148v1 |
2023-12-08 | Selective damping of plasmons in coupled two-dimensional systems by Coulomb drag | The Coulomb drag is a many-body effect observed in proximized low-dimensional
systems. It appears as emergence of voltage in one of them upon passage of bias
current in another. The magnitude of drag voltage can be strongly affected by
exchange of plasmonic excitations between the layers; however, the reverse
effect of... | 2312.05097v1 |
2023-12-13 | Geometrical Interpretation of Neutrino Oscillation with decay | The geometrical representation of two-flavor neutrino oscillation represents
the neutrino's flavor eigenstate as a magnetic moment-like vector that evolves
around a magnetic field-like vector that depicts the Hamiltonian of the system.
In the present work, we demonstrate the geometrical interpretation of neutrino
in a ... | 2312.08178v1 |
2024-01-01 | Magnon Damping Minimum and Logarithmic Scaling in a Kondo-Heisenberg Model | Recently, an anomalous temperature evolution of spin wave excitations has
been observed in a van der Waals metallic ferromagnet Fe$_3$GeTe$_2$ (FGT) [S.
Bao, et al., Phys. Rev. X 12, 011022 (2022)], whose theoretical understanding
yet remains elusive. Here we study the spin dynamics of a ferromagnetic
Kondo-Heisenberg ... | 2401.00758v1 |
2024-01-04 | Simplified Information Geometry Approach for Massive MIMO-OFDM Channel Estimation -- Part II: Convergence Analysis | In Part II of this two-part paper, we prove the convergence of the simplified
information geometry approach (SIGA) proposed in Part I. For a general Bayesian
inference problem, we first show that the iteration of the common second-order
natural parameter (SONP) is separated from that of the common first-order
natural p... | 2401.02037v1 |
2024-01-05 | Solving convex optimization problems via a second order dynamical system with implicit Hessian damping and Tikhonov regularization | This paper deals with a second order dynamical system with a Tikhonov
regularization term in connection to the minimization problem of a convex
Fr\'echet differentiable function. The fact that beside the asymptotically
vanishing damping we also consider an implicit Hessian driven damping in the
dynamical system under s... | 2401.02676v1 |
2024-01-16 | Influence of temperature, doping, and amorphization on the electronic structure and magnetic damping of iron | Hybrid magnonic quantum systems have drawn increased attention in recent
years for coherent quantum information processing, but too large magnetic
damping is a persistent concern when metallic magnets are used. Their intrinsic
damping is largely determined by electron-magnon scattering induced by
spin-orbit interaction... | 2401.08076v1 |
2024-03-13 | Effects of wave damping and finite perpendicular scale on three-dimensional Alfvén wave parametric decay in low-beta plasmas | Shear Alfven wave parametric decay instability (PDI) provides a potential
path toward significant wave dissipation and plasma heating. However,
fundamental questions regarding how PDI is excited in a realistic
three-dimensional (3D) open system and how critically the finite perpendicular
wave scale -- as found in both ... | 2403.08179v1 |
2024-03-19 | Polarization Dynamics in Paramagnet of Charged Quark-Gluon Plasma | It is commonly understood that the strong magnetic field produced in heavy
ion collisions is short-lived. The electric conductivity of the quark-gluon
plasma is unable to significantly extend the life time of magnetic field. We
propose an alternative scenario to achieve this: with finite baryon density and
spin polariz... | 2403.12615v1 |
2006-04-14 | The UCSD Radio-Selected Quasar Survey for Damped Lyman alpha System | As large optical quasar surveys for damped Lya become a reality and the study
of star forming gas in the early Universe achieves statistical robustness, it
is now vital to identify and quantify the sources of systematic error. Because
the nature of optically-selected quasar surveys makes them vulnerable to dust
obscura... | 0604334v1 |
2012-04-12 | Evidence of Gunn-Peterson damping wings in high-z quasar spectra: strengthening the case for incomplete reionization | The spectra of several high-redshift (z>6) quasars have shown evidence for a
Gunn-Peterson (GP) damping wing, indicating a substantial mean neutral hydrogen
fraction (x_HI > 0.03) in the z ~ 6 intergalactic medium (IGM). However,
previous analyses assumed that the IGM was uniformly ionized outside of the
quasar's HII r... | 1204.2838v2 |
2013-05-31 | Highly inclined and eccentric massive planets I: Planet-disc interactions | In the Solar System, planets have a small inclination with respect to the
equatorial plane of the Sun, but there is evidence that in extrasolar systems
the inclination can be very high. This spin-orbit misalignment is unexpected,
as planets form in a protoplanetary disc supposedly aligned with the stellar
spin. Planet-... | 1305.7330v1 |
2014-10-20 | Frequency-dependent attenuation and elasticity in unconsolidated earth materials: effect of damping | We use the Discrete Element Method (DEM) to understand the underlying
attenuation mechanism in granular media, with special applicability to the
measurements of the so-called effective mass developed earlier. We consider
that the particles interact via Hertz-Mindlin elastic contact forces and that
the damping is descri... | 1410.5484v2 |
2020-08-05 | Fast optimization via inertial dynamics with closed-loop damping | In a Hilbert space $H$, in order to develop fast optimization methods, we
analyze the asymptotic behavior, as time $t$ tends to infinity, of inertial
continuous dynamics where the damping acts as a closed-loop control. The
function $f: H \to R$ to be minimized (not necessarily convex) enters the
dynamic through it grad... | 2008.02261v3 |
2023-01-10 | Cosmic Ray Drag and Damping of Compressive Turbulence | While it is well-known that cosmic rays (CRs) can gain energy from turbulence
via second order Fermi acceleration, how this energy transfer affects the
turbulent cascade remains largely unexplored. Here, we show that damping and
steepening of the compressive turbulent power spectrum are expected once the
damping time $... | 2301.04156v2 |
2024-02-12 | Relaxation of weakly collisional plasma: continuous spectra, Landau eigenmodes, and transition from the collisionless to the fluid limit | The relaxation of a weakly collisional plasma is described by the
Boltzmann-Poisson equations with the Lenard-Bernstein collision operator. We
perform a perturbative analysis of these equations, and obtain, for the first
time, exact analytic solutions, enabling definitive resolutions to
long-standing controversies rega... | 2402.07992v1 |
2008-06-23 | On multi F-nomial coefficients and Inversion formula for F-nomial coefficients | In response to [6], we discover the looked for inversion formula for F-nomial
coefficients. Before supplying its proof, we generalize F-nomial coefficients
to multi F-nomial coefficients and we give their combinatorial interpretation
in cobweb posets language, as the number of maximal-disjoint blocks of the form
sP_{k_... | 0806.3626v2 |
2015-07-06 | On the Kendall Correlation Coefficient | In the present paper, we first discuss the Kendall rank correlation
coefficient. In continuous case, we define the Kendall rank correlation
coefficient in terms of the concomitants of order statistics, find the expected
value of the Kendall rank correlation coefficient and show that the later is
free of n. We also prov... | 1507.01427v1 |
2017-10-12 | The co-Pieri rule for Kronecker coefficients | A fundamental problem in the representation theory of the symmetric group,
Sn, is to describe the coefficients in the decomposition of a tensor product of
two simple representations. These coefficients are known in the literature as
the Kronecker coefficients. The Littlewood--Richardson coefficients appear as
an import... | 1710.04523v3 |
2023-05-04 | All Kronecker coefficients are reduced Kronecker coefficients | We settle the question of where exactly the reduced Kronecker coefficients
lie on the spectrum between the Littlewood-Richardson and Kronecker
coefficients by showing that every Kronecker coefficient of the symmetric group
is equal to a reduced Kronecker coefficient by an explicit construction. This
implies the equival... | 2305.03003v1 |
1995-09-21 | Damped Lyman-alpha and Lyman Limit Absorbers in the Cold Dark Matter Model | We study the formation of damped \lya and Lyman limit absorbers in a
hierarchical clustering scenario using a gas dynamical simulation of an $\Omega
= 1$, cold dark matter universe. In the simulation, these high column density
systems are associated with forming galaxies. Damped \lya absorption, $N_{HI}
\simgt 10^{20.2... | 9509106v1 |
1995-09-21 | Nonlinear Damping of Oscillations in Tidal-Capture Binaries | We calculate the damping of quadrupole f and low order g modes (primary
modes) by nonlinear coupling to other modes of the star. This damping is orders
of magnitude more rapid than direct radiative damping when the primary
amplitude is large, as in tidal capture.
Primary modes destabilize high degree g-modes of half ... | 9509112v1 |
1997-08-12 | Spectroscopy of PKS 0528-260: New Limits on CO Absorption and Emission | We have obtained a moderate resolution spectrum of the quasar PKS 0528-250
with the Red Channel Spectrograph on the Multiple Mirror Telescope (MMT) in
order to study a damped Lyman alpha absorption line system at z = 2.8115.
We obtain a new upper limit for the CO column density for the z = 2.8108
velocity component i... | 9708104v1 |
1998-11-04 | GMRT Observations of Low z Damped Lyman-alpha Absorbers | We present Giant Metrewave Radio Telescope (GMRT) observations of redshifted
HI 21cm absorption in two low redshift (z=0.2212, z=0.0912) damped Lyman-alpha
systems seen towards the gigahertz peaked source OI 363 (z_em = 0.630). The
object at z=0.0912 is the lowest redshift damped Lyman-alpha system known to
date. Groun... | 9811068v1 |
2002-01-25 | Galaxies Associated with z~4 Damped Lya Systems: I. Imaging and Photometric Selection | This paper describes the acquisition and analysis of imaging data for the
identification of galaxies associated with z~4 damped Lya systems. We present
deep BRI images of three fields known to contain four z~4 damped systems. We
discuss the reduction and calibration of the data, detail the color criteria
used to identi... | 0201417v2 |
2002-02-25 | Eccentricity Evolution for Planets in Gaseous Disks | We investigate the hypothesis that interactions between a giant planet and
the disk from which it forms promote eccentricity growth. These interactions
are concentrated at discrete Lindblad and corotation resonances. Interactions
at principal Lindblad resonances cause the planet's orbit to migrate and open a
gap in the... | 0202462v1 |
2003-07-23 | Dusty Molecular Cloud Collapse in the Presence of Alfvén Waves | It has been shown that magnetic fields play an important role in the
stability of molecular clouds, mainly perpendicularly to the field direction.
However, in the parallel direction the stability is a serious problem still to
be explained. Interstellar turbulence may allow the generation of Alfv\'en
waves that propagat... | 0307411v1 |
2005-02-28 | Thermal Evolution of a Pulsating Neutron Star | We have derived a set of equations to describe the thermal evolution of a
neutron star which undergoes small-amplitude radial pulsations. We have taken
into account, in the frame of the General Theory of Relativity, the pulsation
damping due to the bulk and shear viscosity and the accompanying heating of the
star. The ... | 0502583v2 |
2005-05-02 | Collisionless Damping of Fast MHD Waves in Magneto-rotational Winds | We propose collisionless damping of fast MHD waves as an important mechanism
for the heating and acceleration of winds from rotating stars. Stellar rotation
causes magnetic field lines anchored at the surface to form a spiral pattern
and magneto-rotational winds can be driven. If the structure is a magnetically
dominat... | 0505013v5 |
2006-08-05 | The nature of damped Lyman alpha and sub-damped Lyman alpha absorbers | We present arguments based on the measured abundances in individual damped
Lyman alpha systems (DLAs) and sub-damped Lyman alpha systems (sub-DLAs), and
also the average abundances inferred in large samples of QSO absorption line
systems, to suggest that the amount of dust in intervening QSO absorbers is
small and is n... | 0608127v2 |
2007-02-12 | The Ucsd/Keck Damped Lya Abundance Database: A Decade of High Resolution Spectroscopy | We publish the Keck/HIRES and Keck/ESI spectra that we have obtained during
the first 10 years of Keck observatory operations. Our full sample includes 42
HIRES spectra and 39 ESI spectra along 65 unique sightlines providing abundance
measurements on ~85 damped Lya systems. The normalized data can be downloaded
from th... | 0702325v1 |
1998-06-30 | Structure and Spin Dynamics of La$_{0.85}$Sr$_{0.15}$MnO$_3$ | Neutron scattering has been used to study the structure and spin dynamics of
La$_{0.85}$Sr$_{0.15}$MnO$_3$. The magnetic structure of this system is
ferromagnetic below T_C = 235 K. We see anomalies in the Bragg peak intensities
and new superlattice peaks consistent with the onset of a spin-canted phase
below T_{CA} = ... | 9806381v1 |
2002-08-29 | Some notes on ideology of waves in plasmas | Our last three papers provide an occasion to make some brief notes on
ideology of waves in plasmas and to rehabilitate Vlasov prescription to
calculate relevant logarithmically divergent integrals in the principal value
sense. In this approach asymptotical solutions of plasma oscillations are
selected according to self... | 0208098v7 |
2007-04-12 | The effect of the solar corona on the attenuation of small-amplitude prominence oscillations. I. Longitudinal magnetic field | Context. One of the typical features shown by observations of solar
prominence oscillations is that they are damped in time and that the values of
the damping times are usually between one and three times the corresponding
oscillatory period. However, the mechanism responsible for the attenuation is
still not well-know... | 0704.1566v2 |
2007-10-01 | Lyman-alpha Damping Wing Constraints on Inhomogeneous Reionization | One well-known way to constrain the hydrogen neutral fraction, x_H, of the
high-redshift intergalactic medium (IGM) is through the shape of the red
damping wing of the Lya absorption line. We examine this method's effectiveness
in light of recent models showing that the IGM neutral fraction is highly
inhomogeneous on l... | 0710.0371v1 |
2008-02-11 | Eccentricity of masing disks in Active Galactic Nuclei | Observations of Keplerian disks of masers in NCG 4258 and other Seyfert
galaxies can be used to obtain geometric distance estimates and derive the
Hubble constant. The ultimate precision of such measurements could be limited
by uncertainties in the disk geometry. Using a time-dependent linear theory
model, we study the... | 0802.1524v1 |
2008-02-20 | The Effect of Charon's Tidal Damping on the Orbits of Pluto's Three Moons | Pluto's recently discovered minor moons, Nix and Hydra, have almost circular
orbits, and are nearly coplanar with Charon, Pluto's major moon. This is
surprising because tidal interactions with Pluto are too weak to damp their
eccentricities. We consider an alternative possibility: that Nix and Hydra
circularize their o... | 0802.2939v1 |
2008-03-18 | Non-adiabatic magnetohydrodynamic waves in a cylindrical prominence thread with mass flow | High-resolution observations show that oscillations and waves in prominence
threads are common and that they are attenuated in a few periods. In addition,
observers have also reported the presence of material flows in such prominence
fine-structures. Here we investigate the time damping of non-leaky oscillations
suppor... | 0803.2600v2 |
2008-07-28 | Thermal fluctuations in moderately damped Josephson junctions: Multiple escape and retrapping, switching- and return-current distributions and hysteresis | A crossover at a temperature T* in the temperature dependence of the width s
of the distribution of switching currents of moderately damped Josephson
junctions has been reported in a number of recent publications, with positive
ds/dT and IV characteristics associated with underdamped behaviour for lower
temperatures T<... | 0807.4502v1 |
2009-02-26 | Viscous propagation of mass flow variability in accretion discs | We study mass flow rate through a disc resulting from a varying mass supply
rate. Variable mass supply rate occurs, e.g., during disc state transitions,
and in interacting eccentric binaries. It is, however, damped by the viscosity
of the disc. Here, we calculate this damping in detail. We derive an analytical
descript... | 0902.4530v2 |
2010-04-09 | Oscillations of weakly viscous conducting liquid drops in a strong magnetic field | We analyse small-amplitude oscillations of a weakly viscous electrically
conducting liquid drop in a strong uniform DC magnetic field. An asymptotic
solution is obtained showing that the magnetic field does not affect the shape
eigenmodes, which remain the spherical harmonics as in the non-magnetic case.
Strong magneti... | 1004.1548v2 |
2011-02-03 | Damping of Electron Density Structures and Implications for Interstellar Scintillation | The forms of electron density structures in kinetic Alfven wave turbulence
are studied in connection with scintillation. The focus is on small scales $L
\sim 10^8-10^{10}$ cm where the Kinetic Alfv\'en wave (KAW) regime is active in
the interstellar medium. MHD turbulence converts to a KAW cascade, starting at
10 times... | 1102.0810v2 |
2011-09-28 | Different dimensionality trends in the Landau damping of magnons in iron, cobalt and nickel: time dependent density functional study | We study the Landau damping of ferromagnetic magnons in Fe, Co, and Ni as the
dimensionality of the system is reduced from three to two. We resort to the
\textit{ab initio} linear response time dependent density functional theory in
the adiabatic local spin density approximation. The numerical scheme is based
on the Ko... | 1109.6217v2 |
2011-10-06 | Dissipative and conservative nonlinearity in carbon nanotube and graphene mechanical resonators | Graphene and carbon nanotubes represent the ultimate size limit of one and
two-dimensional nanoelectromechanical resonators. Because of their reduced
dimensionality, graphene and carbon nanotubes display unusual mechanical
behavior; in particular, their dynamics is highly nonlinear. Here, we review
several types of non... | 1110.1234v1 |
2012-06-02 | Slow Mode Oscillations and Damping of Hot Solar Coronal Loops | The effect of temperature inhomogeneity on the periods, their ratios
(fundamental vs. first overtone), and the damping times of the standing slow
modes in gravitationally stratified solar coronal loops are studied. The
effects of optically thin radiation, compressive viscosity, and thermal
conduction are considered. Th... | 1206.0366v1 |
2012-09-15 | Damped kink oscillations of flowing prominence threads | Transverse oscillations of thin threads in solar prominences are frequently
reported in high-resolution observations. Two typical features of the
observations are that the oscillations are damped in time and that simultaneous
mass flows along the threads are detected. Flows cause the dense threads to
move along the pro... | 1209.3382v1 |
2013-04-13 | Parametric survey of longitudinal prominence oscillation simulations | It is found that both microflare-sized impulsive heating at one leg of the
loop and a suddenly imposed velocity perturbation can propel the prominence to
oscillate along the magnetic dip. An extensive parameter survey results in a
scaling law, showing that the period of the oscillation, which weakly depends
on the leng... | 1304.3798v1 |
2013-06-08 | Observation of a Berry phase anti-damping spin-orbit torque | Recent observations of current-induced magnetization switching at
ferromagnet/normal-conductor interfaces have important consequences for future
magnetic memory technology. In one interpretation, the switching originates
from carriers with spin-dependent scattering giving rise to a relativistic
anti-damping spin-orbit ... | 1306.1893v1 |
2013-08-20 | Stringent constraints on the H I spin temperature in two z > 3 Damped Lyman-alpha systems from redshifted 21 cm absorption studies | Physical properties of Damped Lyman-alpha absorbers and their evolution are
closely related to galaxy formation and evolution theories, and have important
cosmological implications. H I 21 cm absorption study is one useful way of
measuring the temperature of these systems. In this work, very strong
constraints on the t... | 1308.4410v1 |
2013-09-26 | Non-Landau damping of magnetic excitations in systems with localized and itinerant electrons | We discuss the form of the damping of magnetic excitations in a metal near a
ferromagnetic instability. The paramagnon theory predicts that the damping term
should have the form $\Omega/\Gamma (q)$ with $\Gamma (q) \propto q$ (the
Landau damping). However, the experiments on uranium metallic compounds UGe$_2$
and UCoGe... | 1309.7065v3 |
2014-06-16 | Design of the Readout Electronics for the Qualification Model of DAMPE BGO Calorimeter | The DAMPE (DArk Matter Particle Explorer) is a scientific satellite being
developed in China, aimed at cosmic ray study, gamma ray astronomy, and
searching for the clue of dark matter particles, with a planned mission period
of more than 3 years and an orbit altitude of about 500 km. The BGO
Calorimeter, which consists... | 1406.3886v1 |
2015-04-17 | Chiral damping of magnetic domain walls | Structural symmetry breaking in magnetic materials is responsible for a
variety of outstanding physical phenomena. Examples range from the existence of
multiferroics, to current induced spin orbit torques (SOT) and the formation of
topological magnetic structures. In this letter we bring into light a novel
effect of th... | 1504.04411v1 |
2015-07-28 | Spatial damping of propagating sausage waves in coronal cylinders | Sausage modes are important in coronal seismology. Spatially damped
propagating sausage waves were recently observed in the solar atmosphere. We
examine how wave leakage influences the spatial damping of sausage waves
propagating along coronal structures modeled by a cylindrical density
enhancement embedded in a unifor... | 1507.07724v1 |
2015-10-19 | On the branching of the quasinormal resonances of near-extremal Kerr black holes | It has recently been shown by Yang. et. al. [Phys. Rev. D {\bf 87}, 041502(R)
(2013)] that rotating Kerr black holes are characterized by two distinct sets
of quasinormal resonances. These two families of quasinormal resonances display
qualitatively different asymptotic behaviors in the extremal ($a/M\to 1$)
black-hole... | 1510.05604v1 |
2016-02-16 | Damping and power spectra of quasi-periodic intensity disturbances above a solar polar coronal hole | We study intensity disturbances above a solar polar coronal hole seen in the
AIA 171 \AA\ and 193 \AA\ passbands, aiming to provide more insights into their
physical nature. The damping and power spectra of the intensity disturbances
with frequencies from 0.07 mHz to 10.5 mHz are investigated. The damping of the
intens... | 1602.04883v1 |
2016-04-20 | Nonlinear wave damping due to multi-plasmon resonances | For short wavelengths, it is well known that the linearized Wigner-Moyal
equation predicts wave damping due to wave-particle interaction, where the
resonant velocity shifted from the phase velocity by a velocity $v_q = \hbar
k/2m$. Here $\hbar$ is the reduced Planck constant, $k$ is the wavenumber and
$m$ is the electr... | 1604.05983v2 |
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