publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2021-04-19 | Giant spin-orbit torque efficiency in all-epitaxial heterostructures | A large anti-damping spin-obit torque (SOT) efficiency in magnetic
heterostructures is a prerequisite to realize energy efficient spin torque
based magnetic memories and logic devices. The efficiency can be characterized
in terms of the spin-orbit fields generated by anti-damping torques when an
electric current is pas... | 2104.09168v1 |
2021-06-10 | Constraining extra dimensions using observations of black hole quasi-normal modes | The presence of extra dimensions generically modify the spacetime geometry of
a rotating black hole, by adding an additional hair, besides the mass $M$ and
the angular momentum $J$, known as the `tidal charge' parameter, $\beta$. In a
braneworld scenario with one extra spatial dimension, the extra dimension is
expected... | 2106.05558v2 |
2021-06-24 | A Polarizable Water Potential Derived from a Model Electron Density | A new empirical potential for efficient, large scale molecular dynamics
simulation of water is presented. The HIPPO (Hydrogen-like Intermolecular
Polarizable POtential) force field is based upon the model electron density of
a hydrogen-like atom. This framework is used to derive and parameterize
individual terms descri... | 2106.13116v3 |
2021-07-19 | Long term behavior of 2D and 3D non-autonomous random convective Brinkman-Forchheimer equations driven by colored noise | The long time behavior of Wong-Zakai approximations of 2D as well as 3D
non-autonomous stochastic convective Brinkman-Forchheimer (CBF) equations with
non-linear diffusion terms on bounded and unbounded ($\mathbb{R}^d$ for
$d=2,3$) domains is discussed in this work. To establish the existence of
random pullback attract... | 2107.08890v1 |
2021-07-28 | Queue-Channel Capacities with Generalized Amplitude Damping | The generalized amplitude damping channel (GADC) is considered an important
model for quantum communications, especially over optical networks. We make two
salient contributions in this paper apropos of this channel. First, we consider
a symmetric GAD channel characterized by the parameter $n=1/2,$ and derive its
exact... | 2107.13486v1 |
2021-07-31 | Damped inertial dynamics with vanishing Tikhonov regularization: strong asymptotic convergence towards the minimum norm solution | In a Hilbert space, we provide a fast dynamic approach to the hierarchical
minimization problem which consists in finding the minimum norm solution of a
convex minimization problem. For this, we study the convergence properties of
the trajectories generated by a damped inertial dynamic with Tikhonov
regularization. Whe... | 2108.00203v1 |
2021-08-11 | Numerical investigation of the formation and stability of homogeneous pairs of soft particles in inertial microfluidics | We investigate the formation and stability of a pair of identical soft
capsules in channel flow under mild inertia. We employ a combination of the
lattice Boltzmann, finite element and immersed boundary methods to simulate the
elastic particles in flow. Validation tests show excellent agreement with
numerical results o... | 2108.05277v1 |
2021-08-13 | Nonlinear modal testing of damped structures: Velocity feedback vs. phase resonance | In recent years, a new method for experimental nonlinear modal analysis has
been developed, which is based on the extended periodic motion concept. The
method is well suited to experimentally obtain amplitude-dependent modal
properties (modal frequency, damping ratio and deflection shape) for strongly
nonlinear systems... | 2108.06189v1 |
2021-09-21 | Double diffusion structure of logarithmically damped wave equations with a small parameter | We consider a wave equation with a nonlocal logarithmic damping depending on
a small parameter $\theta \in (0,1/2)$. This research is a counter part of that
was initiated by Charao-D'Abbicco-Ikehata considered in [5] for the large
parameter case $\theta \in (1/2,1)$. We study the Cauchy problem for this model
in the wh... | 2109.09944v2 |
2021-09-21 | Non-intrusive Balancing Transformation of Highly Stiff Systems with Lightly-damped Impulse Response | Balanced truncation (BT) is a model reduction method that utilizes a
coordinate transformation to retain eigen-directions that are highly observable
and reachable. To address realizability and scalability of BT applied to highly
stiff and lightly-damped systems, a non-intrusive data-driven method is
developed for balan... | 2109.10408v2 |
2021-10-08 | Site characterization at Treasure Island and Delaney Park downhole arrays by heterogeneous data assimilation | This article extends a recently proposed heterogeneous data assimilation
technique for site characterization to estimate compression and shear wave
velocity (Vp and Vs, respectively) and damping at Treasure Island and Delaney
Park downhole arrays. The adopted method is based on the joint inversion of
earthquake acceler... | 2110.03849v1 |
2021-11-01 | On the stochastic nature of Galactic cosmic-ray sources | The precision measurements of the spectra of cosmic ray nuclei and leptons in
recent years have revealed the existence of multiple features, such as the
spectral break at $\sim 300$ GV rigidity seen by PAMELA and AMS-02 and more
recently confirmed by DAMPE and CALET, the softening in the spectra of H and He
nuclei at $... | 2111.01171v2 |
2021-11-09 | The In Situ Signature of Cyclotron Resonant Heating | The dissipation of magnetized turbulence is an important paradigm for
describing heating and energy transfer in astrophysical environments such as
the solar corona and wind; however, the specific collisionless processes behind
dissipation and heating remain relatively unconstrained by measurements. Remote
sensing obser... | 2111.05400v2 |
2021-11-10 | Quantum amplitude damping for solving homogeneous linear differential equations: A noninterferometric algorithm | In contexts where relevant problems can easily attain configuration spaces of
enormous sizes, solving Linear Differential Equations (LDEs) can become a hard
achievement for classical computers; on the other hand, the rise of quantum
hardware can conceptually enable such high-dimensional problems to be solved
with a for... | 2111.05646v2 |
2021-11-13 | Attenuation of surface modes in granular media | In this work, an unconsolidated granular medium, made of silica microbeads,
is experimentally tested in a laboratory setting. The objective is to
investigate the attenuation mechanisms of vertically polarized seismic waves
traveling at the surface of unconsolidated substrates that are characterized by
power-law rigidit... | 2111.07199v1 |
2021-11-15 | The Interplay of Regularizing Factors in the Model of Upper Hybrid Oscillations of Cold Plasma | A one-dimensional nonlinear model of the so-called upper hybrid oscillations
in a magnetoactive plasma is investigated taking into account electron-ion
collisions. It is known that both the presence of an external magnetic field of
strength $ B_0 $ and a sufficiently large collisional factor $ \nu $ help
suppress the f... | 2111.07826v3 |
2021-11-20 | Excitation and Damping of Slow Magnetosonic Waves in Flaring Hot Coronal Loops: Effects of Compressive Viscosity | Slow magnetosonic waves associated with flares were observed in coronal loops
by SOHO/SUMER, SDO/AIA in various EUV bandpasses, and other instruments. The
excitation and damping of slow magnetosonic waves provides information on the
magnetic, temperature, and density structure of the loops. Recently, it was
found using... | 2111.10696v1 |
2021-11-27 | Rate of Entropy Production in Stochastic Mechanical Systems | Entropy production in stochastic mechanical systems is examined here with
strict bounds on its rate. Stochastic mechanical systems include pure
diffusions in Euclidean space or on Lie groups, as well as systems evolving on
phase space for which the fluctuation-dissipation theorem applies, i.e.,
return-to-equilibrium pr... | 2111.13930v1 |
2021-12-22 | Strong Stabilization of a 3D Potential Flow via a Weakly Damped von Karman Plate | The elimination of aeroelastic instability (resulting in sustained
oscillations of bridges, buildings, airfoils) is a central engineering and
design issue. Mathematically, this translates to strong asymptotic
stabilization of a 3D flow by a 2D elastic structure. The stabilization
(convergence to the stationary set) of ... | 2112.12208v1 |
2021-12-28 | Kinetic investigation of the planar Multipole Resonance Probe under arbitrary pressure | Active plasma resonance spectroscopy (APRS) refers to a class of plasma
diagnostic methods that use the ability of plasma to resonate at or near the
electron plasma frequency for diagnostic purposes. The planar multipole
resonance probe (pMRP) is an optimized realization of APRS. It has a
non-invasive structure and all... | 2112.14190v2 |
2021-12-28 | Metadamping in inertially amplified metamaterials: Trade-off between spatial attenuation and temporal attenuation | Metadamping is the phenomenon of either enhanced or diminished intrinsic
dissipation in a material stemming from the material's internal structural
dynamics. It has been previously shown that a locally resonant elastic
metamaterial may be designed to exhibit higher or lower dissipation compared to
a statically equivale... | 2112.14322v1 |
2022-01-10 | Tidal erasure of stellar obliquities constrains the timing of hot Jupiter formation | Stars with hot Jupiters sometimes have high obliquities, which are possible
relics of hot Jupiter formation. Based on the characteristics of systems with
and without high obliquities, it is suspected that obliquities are tidally
damped when the star has a thick convective envelope, as is the case for
main-sequence star... | 2201.03653v1 |
2022-01-22 | Examining AGN UV/optical Variability Beyond the Simple Damped Random Walk | We present damped harmonic oscillator (DHO) light-curve modeling for a sample
of 12,714 spectroscopically confirmed quasars in the Sloan Digital Sky Survey
Stripe 82 region. DHO is a second-order continuous-time autoregressive
moving-average (CARMA) process, which can be fully described using four
independent parameter... | 2201.08943v2 |
2022-04-20 | Ferrimagnet GdFeCo characterization for spin-orbitronics: large field-like and damping-like torques | Spintronics is showing promising results in the search for new materials and
effects to reduce energy consumption in information technology. Among these
materials, ferrimagnets are of special interest, since they can produce large
spin currents that trigger the magnetization dynamics of adjacent layers or
even their ow... | 2204.09776v1 |
2022-04-21 | Characterizing the $γ$-Ray Variability of Active Galactic Nuclei with Stochastic Process Method | The $\gamma$-ray astronomy in time domain has been by now progressed further
as the variabilities of Active Galactic Nuclei (AGNs) on different timescales
have been reported a lot. We study the $\gamma$-ray variabilities of 23 jetted
AGNs through applying a stochastic process method to the ~12.7 yr long-term
light curv... | 2204.09987v1 |
2022-04-29 | A fast point charge interacting with the screened Vlasov-Poisson system | We consider the long-time behavior of a fast, charged particle interacting
with an initially spatially homogeneous background plasma. The background is
modeled by the screened Vlasov-Poisson equations, whereas the interaction
potential of the point charge is assumed to be smooth. We rigorously prove the
validity of the... | 2205.00035v2 |
2022-05-06 | Discovery of a coherent, wave-like velocity pattern for the Radcliffe Wave | Recently studies discovered that part of the Gould Belt belongs to a 2.7
kpc-long {coherent, thin} wave consisting of a chain of clouds, where a damped
undulation pattern has been identified from the spatial arrangement of the
clouds. We use the proper motions of Young Stellar Objects (YSOs) anchored
inside the clouds ... | 2205.03218v1 |
2022-05-17 | Resolving the HI in Damped Lyman-α systems that power star-formation | Reservoirs of dense atomic gas (primarily hydrogen), contain approximately 90
percent of the neutral gas at a redshift of 3, and contribute to 2-3 percent of
the total baryons in the Universe. These damped Lyman-${\alpha}$ systems (so
called because they absorb Lyman-${\alpha}$ photons from within and from
background s... | 2205.08554v1 |
2022-05-21 | Accuracy of one-dimensional approximation in neutron star quasi-normal modes | Since the eigenfrequency of gravitational waves from cold neutron stars
becomes a complex number, where the real and imaginary parts respectively
correspond to an oscillation frequency and damping rate, one has to somehow
solve the eigenvalue problem concerning the eigenvalue in two-dimensional
parameter space. To avoi... | 2205.10523v1 |
2022-06-02 | Proximity of exoplanets to first-order mean-motion resonances | Planetary formation theories and, more specifically, migration models predict
that planets can be captured in mean-motion resonances (MMRs) during the disc
phase. The distribution of period ratios between adjacent planets shows an
accumulation in the vicinity of the resonance, which is not centred on the
nominal resona... | 2206.00943v1 |
2022-06-03 | Dynamical Instability in Multi-Orbiter Systems with Gas Friction | Closely-packed multi-planet systems are known to experience dynamical
instability if the spacings between the planets are too small. Such instability
can be tempered by the frictional forces acting on the planets from gaseous
discs. A similar situation applies to stellar-mass black holes embedded in AGN
discs around su... | 2206.01755v1 |
2022-08-15 | Nonperturbative approach to interfacial spin-orbit torques induced by Rashba effect | Current-induced spin-orbit torque (SOT) in normal metal/ferromagnet (NM/FM)
bilayers bears great promise for technological applications, but the
microscopic origin of purely interfacial SOTs in ultra-thin systems is not yet
fully understood. Here, we show that a linear response theory with a
nonperturbative treatment o... | 2208.07296v1 |
2022-08-22 | Plasma heating and nanoflare caused by slow-mode wave in a coronal loop | We present a detailed analysis of a reflecting intensity perturbation in a
large coronal loop that appeared as sloshing oscillation and lasted for at
least one and a half periods. The perturbation is initiated by a microflare at
one footpoint of the loop, propagates along the loop and is eventually
reflected at the rem... | 2208.10029v1 |
2022-09-07 | AlH lines in the blue spectrum of Proxima Centauri | The recently-computed ExoMol line lists for isotopologues of AlH are used to
analyse the blue spectrum (4000-4500 {\AA}) of Proxima Cen (M5.5 V). Comparison
of the observed and computed spectra enables the identification of a large
number of 27AlH lines of the A1{\Pi} - X1{\Sigma}+ band system: the spectral
range cover... | 2209.03037v2 |
2022-09-19 | Semi-implicit Integration and Data-Driven Model Order Reduction in Structural Dynamics with Hysteresis | Structural damping is known to be approximately rate-independent in many
cases. Popular models for rate-independent dissipation are hysteresis models;
and a highly popular hysteresis model is the Bouc-Wen model. If such hysteretic
dissipation is incorporated in a refined finite element model, then the
mathematical mode... | 2209.08765v2 |
2022-09-21 | Performance enhancement of a spin-wave-based reservoir computing system utilizing different physical conditions | The authors have numerically studied how to enhance reservoir computing
performance by thoroughly extracting their spin-wave device potential for
higher-dimensional information generation. The reservoir device has a 1-input
exciter and 120-output detectors on the top of a continuous magnetic garnet
film for spin-wave t... | 2209.10123v1 |
2022-10-02 | Reduction in turbulence-induced non-linear dynamic vibration using tuned liquid damper (TLD) | In the present research work, an attempt is made to develop a coupled
non-linear turbulence-structure-damper model in a finite volume-finite
difference (FV-FD) framework. Tuned liquid damper (TLD) is used as the
additional damping system along with inherent structural damping. Real-time
simulation of flow-excited bridg... | 2210.00428v3 |
2022-10-17 | Interpretations of the cosmic ray secondary-to-primary ratios measured by DAMPE | Precise measurements of the boron-to-carbon and boron-to-oxygen ratios by
DAMPE show clear hardenings around $100$ GeV/n, which provide important
implications on the production, propagation, and interaction of Galactic cosmic
rays. In this work we investigate a number of models proposed in literature in
light of the DA... | 2210.09205v3 |
2022-10-19 | Energy Dissipation in Synchronous Binary Asteroids | Synchronous binary asteroids can experience libration about their
tidally-locked equilibrium, which will result in energy dissipation. This is an
important topic to the Asteroid Impact and Deflection Assessment, where
excitation caused by the DART kinetic impact in the Didymos binary asteroid
system may be reduced thro... | 2210.10877v1 |
2022-11-14 | Heavily Damped Precessional Switching with Very Low Write-error Rate in Elliptical-cylinder Magnetic Tunnel Junction | Voltage-induced dynamic switching in magnetic tunnel junctions (MTJs) is a
writing technique for voltage-controlled magnetoresistive random access memory
(VCMRAM), which is expected to be an ultimate non-volatile memory with
ultra-low power consumption. In conventional dynamic switching, the width of
sub-nanosecond wri... | 2211.07148v1 |
2022-11-19 | Regularity to Timoshenko's System with Thermoelasticity of Type III with Fractional Damping | The article, presents the study of the regularity of two thermoelastic beam
systems defined by the Timoshenko beam model coupled with the heat conduction
of Green-Naghdiy theory of type III, both mathematical models are
differentiated by their coupling terms that arise as a consequence of the
constitutive laws initiall... | 2211.10816v2 |
2022-11-28 | Exciting the TTV Phases of Resonant Sub-Neptunes | There are excesses of sub-Neptunes just wide of period commensurabilities
like the 3:2 and 2:1, and corresponding deficits narrow of them. Any theory
that explains this period ratio structure must also explain the strong transit
timing variations (TTVs) observed near resonance. Besides an amplitude and a
period, a sinu... | 2211.15701v2 |
2022-12-04 | An Unsupervised Machine Learning Method for Electron--Proton Discrimination of the DAMPE Experiment | Galactic cosmic rays are mostly made up of energetic nuclei, with less than
$1\%$ of electrons (and positrons). Precise measurement of the electron and
positron component requires a very efficient method to reject the nuclei
background, mainly protons. In this work, we develop an unsupervised machine
learning method to... | 2212.01843v1 |
2022-12-05 | Stability of Cnoidal Waves for the Damped Nonlinear Schrödinger Equation | We consider the cubic nonlinear Schr\"odinger (NLS) equation with a linear
damping on the one dimensional torus and we investigate the stability of some
solitary wave profiles within the dissipative dynamics. The undamped cubic NLS
equation is well known to admit a family of periodic waves given by Jacobi
elliptic func... | 2212.02195v2 |
2022-12-08 | Strong photon-magnon coupling using a lithographically defined organic ferrimagnet | We demonstrate a hybrid quantum system composed of superconducting resonator
photons and magnons hosted by the organic-based ferrimagnet vanadium
tetracyanoethylene (V[TCNE]$_x$). Our work is motivated by the challenge of
scalably integrating an arbitrarily-shaped, low-damping magnetic system with
planar superconductin... | 2212.04423v1 |
2022-12-28 | Scattering of the UHECR at small pitch angle by damped plasma waves | In spite a lot of theoretical and experimental effort that has been achieved
in ultra-high energy cosmic ray (UHECR) scattering research in last few
decades, some questions remain unanswered, or partially answered. Two of them,
that will be in the focus of this paper are: possible source of UHECRs and the
acceleration ... | 2212.13755v1 |
2023-01-23 | Estimation of turbulent proton and electron heating rates via Landau damping constrained by Parker Solar Probe observations | The heating of ions and electrons due to turbulent dissipation plays a
crucial role in the thermodynamics of the solar wind and other plasma
environments. Using magnetic field and thermal plasma observations from the
first two perihelia of the Parker Solar Probe (PSP), we model the relative
heating rates as a function ... | 2301.09713v1 |
2023-02-02 | Leveraging symmetry for an accurate spin-orbit torques characterization in ferrimagnetic insulators | Spin-orbit torques (SOTs) have emerged as an efficient means to electrically
control the magnetization in ferromagnetic heterostructures. Lately, an
increasing attention has been devoted to SOTs in heavy metal (HM)/magnetic
insulator (MI) bilayers owing to their tunable magnetic properties and
insulating nature. Quanti... | 2302.01141v2 |
2022-12-31 | Genuine three qubit Einstein-Podolsky-Rosen steering under decoherence: Revealing hidden genuine steerability via pre-processing | The behaviour of genuine EPR steering of three qubit states under various
environmental noises is investigated. In particular, we consider the two
possible steering scenarios in the tripartite setting: (1 -> 2), where Alice
demonstrates genuine steering to Bob-Charlie, and (2 -> 1), where Alice-Bob
together demonstrate... | 2302.02987v1 |
2023-02-20 | Optimal energy harvesting efficiency from vortex-induced vibration of a circular cylinder under flow | This work applies a combined approach a reduced-order model (ROM) together
with experiments and direct numerical simulations to investigate the optimal
efficiency of fluid-flow energy harvesting from transverse vortex-induced
vibration (VIV) of a circular cylinder. High resolution efficiency maps were
predicted over wi... | 2302.09975v1 |
2023-04-12 | Liouvillian exceptional points in continuous variable system | The Liouvillian exceptional points for a quantum Markovian master equation of
an oscillator in a generic environment are obtained. They occur at the points
when the modified frequency of the oscillator vanishes, whereby the eigenvalues
of the Liouvillian become real. In a generic system there are two parameters
that mo... | 2304.05792v2 |
2023-04-13 | Network-Reconfiguration-Aware Power Oscillation Damping Controller for Newly Commissioned Converter-Interfaced Power Plants | In recent years, transmission system operators have started requesting
converter-interfaced generators (CIGs) to participate in grid services such as
power oscillation damping (POD). As power systems are prone to topology changes
because of connection and disconnection of generators and electrical lines, one
of the mos... | 2304.06555v1 |
2023-06-13 | Particle-resolved study of the onset of turbulence | The transition from laminar to turbulent flow is an immensely important topic
that is still being studied. Here we show that complex plasmas, i.e.,
microparticles immersed in a low temperature plasma, make it possible to study
the particle-resolved onset of turbulence under the influence of damping, a
feat not possible... | 2306.07711v1 |
2023-07-10 | Vibroacoustic simulations of acoustic damping materials using a fictitious domain approach | The numerical investigation of acoustic damping materials, such as foams,
constitutes a valuable enhancement to experimental testing. Typically, such
materials are modeled in a homogenized way in order to reduce the computational
effort and to circumvent the need for a computational mesh that resolves the
complex micro... | 2307.04624v1 |
2023-07-12 | A coupled rate-dependent/rate-independent system for adhesive contact in Kirchhoff-Love plates | We perform a dimension reduction analysis for a coupled
rate-dependent/rate-independent adhesive-contact model in the setting of
visco-elastodynamic plates. We work with a weak solvability notion inspired by
the theory of (purely) rate-independent processes, and accordingly term the
related solutions `Semistable Energe... | 2307.06327v1 |
2023-08-28 | The Effects of Non-Equilibrium Velocity Distributions on Alfvén Ion-Cyclotron Waves in the Solar Wind | In this work, we investigate how the complex structure found in solar wind
proton velocity distribution functions (VDFs), rather than the commonly assumed
two-component bi-Maxwellian structure, affects the onset and evolution of
parallel-propagating microinstabilities. We use the Arbitrary Linear Plasma
Solver (ALPS), ... | 2308.14944v1 |
2023-08-31 | Search for the gamma-ray spectral lines with the DAMPE and the Fermi-LAT observations | Weakly interacting massive particles, as a major candidate of dark matter
(DM), may directly annihilate or decay into high-energy photons, producing
monochromatic spectral lines in the gamma-ray band. These spectral lines, if
detected, are smoking-gun signatures for the existence of new physics. Using
the 5 years of DA... | 2308.16762v1 |
2023-09-06 | Strong magnon-magnon coupling in an ultralow damping all-magnetic-insulator heterostructure | Magnetic insulators such as yttrium iron garnets (YIGs) are of paramount
importance for spin-wave or magnonic devices as their ultralow damping enables
ultralow power dissipation that is free of Joule heating, exotic magnon quantum
state, and coherent coupling to other wave excitations. Magnetic insulator
heterostructu... | 2309.03116v1 |
2023-09-14 | A new break near 10 TeV in the energy spectrum of protons according to data from space-based instruments: astrophysical interpretation | Recent experimental data from space-based instruments of the DAMPE and CALET
collaborations have shown that the energy spectrum of protons has a new
feature, a break in the $\sim 10$ TeV region. In this energy range, the
spectrum index of the observed particles varies from $-2.6$ to $-2.9$.
The purpose of this work i... | 2309.07420v1 |
2023-11-06 | Phase mixing of propagating Alfv{é}n waves in a single-fluid partially ionized solar plasma | Phase mixing of Alfven waves is one of the most promising mechanisms for
heating of the solar atmosphere. The damping of waves in this case requires
small transversal scales, relative to the magnetic field direction. Here this
requirement is achieved by considering a transversal inhomogeneity in the
equilibrium plasma ... | 2311.02989v1 |
2023-11-15 | Damped Proximal Augmented Lagrangian Method for weakly-Convex Problems with Convex Constraints | We give a damped proximal augmented Lagrangian method (DPALM) for solving
problems with a weakly-convex objective and convex linear/nonlinear
constraints. Instead of taking a full stepsize, DPALM adopts a damped dual
stepsize to ensure the boundedness of dual iterates. We show that DPALM can
produce a (near) $\vareps$-... | 2311.09065v1 |
2023-12-07 | Nonlinear aspects of stochastic particle acceleration | In turbulent magnetized plasmas, charged particles can be accelerated to high
energies through their interactions with the turbulent motions. As they do so,
they draw energy from the turbulence, possibly up to the point where they start
modifying the turbulent cascade. Stochastic acceleration then enters a
nonlinear re... | 2312.04443v2 |
2023-12-12 | Circularization in the damped Kepler problem | In this paper, we revisit the damped Kepler problem within a general family
of nonlinear damping forces with magnitude $\delta \vert u\vert^{\beta}\vert
\dot u\vert^{\alpha+1}$, depending on three parameters $\delta>0,\alpha\ge 0$
and $\beta\ge 0$, and address the general question of circularization whereby
orbits tend... | 2312.07249v1 |
2023-12-21 | Annealing reduces Si$_3$N$_4$ microwave-frequency dielectric loss in superconducting resonators | The dielectric loss of silicon nitride (Si$_3$N$_4$) limits the performance
of microwave-frequency devices that rely on this material for sensing, signal
processing, and quantum communication. Using superconducting resonant circuits,
we measure the cryogenic loss tangent of either as-deposited or
high-temperature annea... | 2312.13504v1 |
2024-01-11 | Instability windows of relativistic r-modes | The detectability of the gravitational-wave signal from $r$-modes depends on
the interplay between the amplification of the mode by the CFS instability and
its damping due to dissipative mechanisms present in the stellar matter. The
instability window of $r$-modes describes the region of stellar parameters
(angular vel... | 2401.06200v1 |
2024-02-02 | Controllable frequency tunability and parabolic-like threshold current behavior in spin Hall nano-oscillators | We investigate the individual impacts of critical magnetodynamical
parameters-effective magnetization and magnetic damping-on the auto-oscillation
characteristics of nano-constriction-based Spin Hall Nano-Oscillators (SHNOs).
Our micromagnetic simulations unveil a distinctive non-monotonic relationship
between current ... | 2402.01570v1 |
2024-02-06 | The fermion self-energy and damping rate in a hot magnetized plasma | We derive a general expression for the fermion self-energy in a hot
magnetized plasma by using the Landau-level representation. In the one-loop
approximation, the Dirac structure of the self-energy is characterized by five
different functions that depend on the Landau-level index $n$ and the
longitudinal momentum $p_z$... | 2402.04307v2 |
2024-03-18 | Radiative loss and ion-neutral collisional effects in astrophysical plasmas | In this paper we study the role of radiative cooling in a two-fluid model
consisting of coupled neutrals and charged particles. We first analyze the
linearized two-fluid equations where we include radiative losses in the energy
equation for the charged particles. In a 1D geometry for parallel propagation
and in the lim... | 2403.11900v1 |
2024-04-02 | A new gap in the critical exponent for semi-linear structurally damped evolution equations | Our aim in this paper is to discuss the critical exponent in semi-linear
structurally damped wave and beam equations with additional dispersion term.
The special model we have in mind is $$
u_{tt}(t,x)+(-\Delta)^{\sigma}u(t,x)+(-\Delta)^{2\delta}u(t,x)+2(-\Delta)^{\delta}u_{t}(t,x)=\left|u(t,x)\right|
^{p} $$ where the... | 2404.01544v1 |
1999-07-23 | Autoregressive model of 1/f noise | An analytically solvable model is proposed exhibiting 1/f spectrum in any
desirably wide range of frequency (but excluding the point f=0). The model
consists of pulses whose recurrence times obey an autoregressive process with
very small damping. | 9907008v1 |
1996-08-22 | Evolution of Neutral Gas at High Redshift -- Implications for the Epoch of Galaxy Formation | Though observationally rare, damped Lya absorption systems dominate the mass
density of neutral gas in the Universe. Eleven high redshift damped Lya systems
covering 2.8<z<4.4 were discovered in 26 QSOs from the APM z>4 QSO Survey,
extending these absorption system surveys to the highest redshifts currently
possible. C... | 9608147v1 |
1997-07-14 | Damped Lyman-alpha Absorption Associated with an Early-Type Galaxy at Redshift z = 0.16377 | We report new HST and ground-based observations of a damped Lyman-alpha
absorption system toward the QSO 0850+4400. The redshift of the absorption
system is z = 0.163770 and the neutral hydrogen column density of the
absorption system is log N = 19.81 cm**-2. The absorption system is by far the
lowest redshift confirme... | 9707157v1 |
1997-08-27 | Reionization of the Intergalactic Medium and the Damping Wing of the Gunn-Peterson Trough | Observations of high-redshift quasars show that the IGM must have been
reionized at some redshift $z>5$. If a source of radiation could be observed at
the rest-frame Lya wavelength, at a sufficiently high redshift where some of
the IGM in the line-of-sight was not yet reionized, the Gunn-Peterson trough
should be prese... | 9708253v1 |
1997-09-16 | On the nature of z(abs) ~ z(em) damped absorbers in quasar spectra | We present spectroscopic observations of the damped Ly-alpha absorber at
redshift z=1.9342 seen in the spectrum of the quasar Q0151+048A. The redshift
of the absorber is greater than the redshift of the quasar, so the system
resembles the z(abs) ~ z(em) damped absorber at z=2.81 towards the quasar
PKS0528-250. We have ... | 9709160v1 |
1998-01-15 | A HST Spectroscopic study of QSOs with intermediate redshift damped Lyman-alpha systems | We present HST spectra for a sample of six QSOs with intermediate redshift
(z_a < 1) damped Ly-alpha systems. These observations aim at measuring the HI
column density and detect metal lines in order to investigate the metal
enrichment of the gas, as well as the presence of neutral species, molecules
and dust. All syst... | 9801146v1 |
1998-06-15 | On the kinematics of damped Lyman-alpha systems | We report on high spectral resolution observations of five damped Ly-alpha
absorbers. Line velocity profiles and heavy element abundances are discussed.
Nitrogen is found to have abundances less than silicon in the systems toward Q
0347-383, Q 0913+072, and Q 1213+093. The absorber toward Q 0913+072 is the
most metal-d... | 9806202v1 |
1999-10-07 | Si and Mn Abundances in Damped Lya Systems with Low Dust Content | We have measured the abundances of Zn, Si, Mn, Cr, Fe, and Ni in three damped
Lyman alpha systems at redshifts z < 1 from high resolution echelle spectra of
QSOs recorded with the Keck I telescope. In all three cases the abundances of
Cr, Fe, and Ni relative to Zn indicate low levels of dust depletions. We
propose that... | 9910131v1 |
1999-11-23 | On the orbital evolution and growth of protoplanets embedded in a gaseous disc | We present a new computation of the linear tidal interaction of a
protoplanetary core with a thin gaseous disc in which it is fully embedded. For
the first time a discussion of the orbital evolution of cores with eccentricity
(e) significantly larger than the gas-disc scale height to radius ratio (H/r)
is given. We fin... | 9911431v1 |
1999-12-14 | Finding typical high redshift galaxies with the NOT | We present results from an ongoing search for galaxy counterparts of a
subgroup of Quasar Absorption Line Systems called Damped Ly-alpha Absorbers
(DLAs). DLAs have several characteristics that make them prime candidates for
being the progenitors of typical present day galaxies. | 9912278v1 |
2000-10-21 | UVES observations of QSO 0000-2620: Argon and Phosphorus abundances in the dust-free damped Ly-alpha system at zabs = 3.3901 | The UV resonance transitions of neutral argon ArI 1066 A, and of singly
ionized phosphorus PII 963 A, originated in the damped Ly_alpha system (DLA) at
zabs = 3.3901 towards QSO 0000--2620 have been detected by means of the UVES
spectrograph at the 8.2m ESO KUEYEN telescope. So far, this is the first
measurement of ArI... | 0010434v1 |
2001-09-21 | Coincidences of high density peaks in UVES spectra of QSO pairs | We present preliminary results of an investigation of the clustering
properties of high matter density peaks between redshift ~2 and ~3, as traced
by Lyman limit and Damped Ly-alpha systems in spectra of close QSO pairs and
groups. | 0109373v1 |
2002-01-31 | Electron impact excitation of helium-like oxygen up to n = 4 levels including radiation damping | The primary X-ray diagnostic lines in He-like ions are mainly excited by
electron impact from the ground level to the n = 2 levels, but at high
temperatures n > 2 levels are also excited. In order to describe the atomic
processes more completely collision strengths are computed for OVII including
for the first time all... | 0201535v1 |
2002-12-07 | Improved Bounds on Violation of the Strong Equivalence Principle | I describe a unique, 20-year-long timing program for the binary pulsar
B0655+64, the stalwart control experiment for measurements of gravitational
radiation damping in relativistic neutron-star binaries. Observed limits on
evolution of the B0655+64 orbit provide new bounds on the existence of dipolar
gravitational radi... | 0212180v1 |
2004-04-13 | The Fine-structure Constant as a Probe of Chemical Evolution and AGB Nucleosynthesis in Damped Lyman-alpha Systems | Evidence from a large sample of quasar absorption-line spectra in damped
Lyman-alpha systems has suggested a possible time variation of the fine
structure constant alpha. The most statistically significant portion of this
sample involves the comparison of Mg and Fe wavelength shifts using the
many-multiplet (MM) method... | 0404257v2 |
2006-01-23 | Bulk viscosity of a gas of neutrinos and coupled scalar particles, in the era of recombination | Bulk viscosity may serve to damp sound waves in a system of neutrinos coupled
to very light scalar particles, in the era after normal neutrino decoupling but
before recombination. We calculate the bulk viscosity parameter in a minimal
scheme involving the coupling of the two systems. We add some remarks on the
bulk vis... | 0601525v1 |
2006-09-28 | Turbulent Comptonization in Relativistic Accretion Disks | Turbulent Comptonization, a potentially important damping and radiation
mechanism in relativistic accretion flows, is discussed. Particular emphasis is
placed on the physical basis, relative importance, and thermodynamics of
turbulent Comptonization. The effects of metal-absorption opacity on the
spectral component res... | 0609797v1 |
1994-05-16 | Bifurcations of two coupled classical spin oscillators | Two classical, damped and driven spin oscillators with an isotropic exchange
interaction are considered. They represent a nontrivial physical system whose
equations of motion are shown to allow for an analytic treatment of local
codimension 1 and 2 bifurcations. In addition, numerical results are presented
which exhibi... | 9405011v1 |
1998-04-02 | The Decay Properties of the Finite Temperature Density Matrix in Metals | Using ordinary Fourier analysis, the asymptotic decay behavior of the density
matrix F(r,r') is derived for the case of a metal at a finite electronic
temperature. An oscillatory behavior which is damped exponentially with
increasing distance between r and r' is found. The decay rate is not only
determined by the elect... | 9804013v1 |
1998-12-02 | Dissipative properties of vibrated granular materials | We investigate collective dissipative properties of vibrated granular
materials by means of molecular dynamics simulations. Rates of energy losses
indicate three different regimes or "phases"in the amplitude-frequency plane of
the external forcing, namely, solid, convective, and gas-like regimes. The
behavior of effect... | 9812036v1 |
1999-01-14 | Spin dynamics in the generalized ferromagnetic Kondo model for manganites | Dynamical spin susceptibility is calculated for the generalized ferromagnetic
Kondo model which describes itinerant $e_{g}$ electrons interacting with
localized $t_{2g}$ electrons with antiferromagnetic coupling. The calculations
done in the mean field approximation show that the spin-wave spectrum of the
system in fer... | 9901141v1 |
1999-10-01 | Properties of excitations in systems with a spinor Bose-Einstein condensate | General theory in case of homogenous Bose-Einstein condensed systems with
spinor condensate is presented for the correlation functions of density and
spin fluctuations and for the one-particle propagators as well. The random
phase approximation is investigated and the damping of the modes is given in
the intermediate t... | 9910010v1 |
2001-07-16 | Anomalous Levy decoherence | We investigate the decoherence of a small quantum system weakly coupled to a
complex, chaotic environment when the dynamics is not Gaussian but Levy
anomalous. By studying the time dependence of the linear entropy and the
damping of the interference of two Gaussian wave packets in the Wigner
representation, we show tha... | 0107344v1 |
2001-09-05 | Nuclear resonant scattering of Synchrotron radiation from nuclei in the Browninan motion | The time evolution of the coherent forward scattering of Synchrotron
radiation for resonant nuclei in Brownian motion is studied . Apart from target
thickness, the appearance of dynamical beats also depends on $\alpha$ which is
the ratio of harmonic force constant to the damping force constant of a
harmonic oscillator ... | 0109074v2 |
2002-03-06 | Effect of electron-phonon interaction on the shift and attenuation of optical phonons | Using the Boltzmann equation for electrons in metals, we show that the
optical phonons soften and have a dispersion due to screening in agreement with
the results reported recently [M. Reizer, Phys. Rev. B {\bf 61}, 40 (2000)].
Additional phonon damping and frequency shift arise when the electron--phonon
interaction is... | 0203112v1 |
2002-04-09 | Spatial resolution of spin waves in an ultra-cold gas | We present the first spatially resolved images of spin waves in a gas. The
complete longitudinal and transverse spin field as a function of time and space
is reconstructed. Frequencies and damping rates for a standing-wave mode are
extracted and compared with theory. | 0204182v1 |
2002-08-14 | Three-wave mixing of Bogoliubov quasi-particles in a Bose condensate | A dressed basis is used to calculate the dynamics of three-wave mixing
between Bogoliubov quasi-particles in a Bose condensate. Due to the observed
oscillations between different momenta modes, an energy splitting, analogous to
the optical Mollow triplet, appears in the Beliaev damping spectrum of the
excitations from ... | 0208283v2 |
2002-11-08 | Reply on ``Fluctuation-dissipation considerations for phenomenological damping models for ferromagnetic thin films'' [N. Smith, J. Appl. Phys. \bf{92}, 3877 (2002)] | We show that the critique of our recent papers presented in the
abovementioned paper (NS) appeals to an incorrect mathematical analogy between
electrical circuits and linear magnetization dynamics, improperly uses
classical concepts of normal modes and basic equations, gives inconsistent
results and therefore comes to ... | 0211147v1 |
2003-02-04 | Squeezing and temperature measurement in Bose-Einstein Condensates | In this paper we discuss the presence of temperature-dependent squeezing in
the collective excitations of trapped Bose-Einstein condensates, based on a
recent theory of quasiparticle damping. A new scheme to measure temperature
below the critical temperature is also considered. | 0302068v1 |
2003-03-12 | Time-Dependent Dynamics of the Bose-Fermi Mixed Condensed System | We study the monopole oscillation in the bose-fermi mixed condensed system by
performing the time-dependent Gross-Pitaevsky (GP) and Vlasov equations. We
find that the big damping exists for the fermion oscillation in the mixed
system even at zero temperature | 0303216v1 |
2005-10-06 | Thermal processes induced in carbon nanotubes by attosecond laser pulses | In this paper the heat transport in carbon nanotubes is investigated. When
the dimension of the structure is of the order of the de Broglie wave length
the transport phenomena must be analyzed within quantum mechanics. In this
paper we developed the Dirac type thermal equation. The solution of the
equation the temperat... | 0510141v1 |
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