publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2022-06-09 | Excitation-damping quantum channels | We study a class of quantum channels describing a quantum system, split into
the direct sum of an excited and a ground sector, undergoing a one-way transfer
of population from the former to the latter; this construction, which provides
a generalization of the amplitude-damping qubit channel, can be regarded as a
way to... | 2206.04623v1 |
2022-06-16 | Modeling, robust control synthesis and worst-case analysis for an on-orbit servicing mission with large flexible spacecraft | This paper outlines a complete methodology for modeling an on-orbit servicing
mission scenario and designing a feedback control system for the attitude
dynamics that is guaranteed to robustly meet pointing requirements, despite
model uncertainties as well as large inertia and flexibility changes throughout
the mission ... | 2206.08324v1 |
2022-06-23 | Anisotropic magnon damping by zero-temperature quantum fluctuations in ferromagnetic CrGeTe$_3$ | Spin and lattice are two fundamental degrees of freedom in a solid, and their
fluctuations about the equilibrium values in a magnetic ordered crystalline
lattice form quasiparticles termed magnons (spin waves) and phonons (lattice
waves), respectively. In most materials with strong spin-lattice coupling
(SLC), the inte... | 2206.11962v1 |
2022-06-28 | Strongly damped wave equations with mass-like terms of the logarithmic-Laplacian | We consider strongly damped wave equations with logarithmic mass-like terms
with a parameter $\theta \in (0; 1]$. This research is a part of a series of
wave equations that was initiated by Char\~ao-Ikehata [6],
Char\~ao-D'Abbicco-Ikehata considered in [5] depending on a parameter $\theta
\in (1/2,1)$ and Piske- Char\~... | 2206.13713v1 |
2022-07-07 | Control of Oscillatory Temperature Field in a Building via Damping Assignment to Nonlinear Koopman Mode | This paper addresses a control problem on air-conditioning systems in
buildings that is regarded as a control practice of nonlinear
distributed-parameter systems. Specifically, we consider the design of a
controller for suppressing an oscillatory response of in-room temperature
field. The main idea in this paper is to ... | 2207.03219v1 |
2022-07-07 | New perspectives on transient stability between grid-following and grid-forming VSCs | The grid-following and grid-forming controls in voltage-source converters are
considered as different operation modes and the synchronization mechanism of
them are studied separately. In this article, the intrinsic relationships
between gridfollowing and grid-forming controlled converters are established as
follows: 1)... | 2207.03273v1 |
2022-07-11 | Rapid Stabilization of Timoshenko Beam by PDE Backstepping | In this paper, we present a rapid boundary stabilization of a Timoshenko beam
with anti-damping and anti-stiffness at the uncontrolled boundary, by using PDE
backstepping. We introduce a transformation to map the Timoshenko beam states
into a (2+2) x (2+2) hyperbolic PIDE-ODE system. Then backstepping is applied
to obt... | 2207.04746v1 |
2022-07-17 | Locational Aspect of Fast Frequency Reserves in Low-Inertia Systems -- Control Performance Analysis | This paper evaluates the frequency performance of an AC system when primary
frequency response is provided by inverter-based resources located at
remote-areas. Due to potentially larger wave propagation constants over longer
lines, fast active power response from inverter based resources may have a
negative impact on t... | 2207.08188v1 |
2022-07-20 | MsSpec-DFM (Dielectric function module): Towards a multiple scattering approach to plasmon description | We present here the MsSpec Dielectric Function module (MsSpec-DFM), which
generates dielectric functions in an electron gas or a liquid, either isolated
or embedded into an environment. In addition to standard models such as the
plasmon pole and the RPA, this module also provides more involved methods
incorporating loc... | 2207.09924v1 |
2022-07-25 | Extreme bursting events via pulse-shaped explosion in mixed Rayleigh-Lienard nonlinear oscillator | We study the dynamics of a parametrically and externally driven
Rayleigh-Lienard hybrid model and report the emergence of extreme bursting
events due to a novel pulse-shaped explosion mechanism. The system exhibits
complex periodic and chaotic bursting patterns amid small oscillations as a
function of excitation freque... | 2207.11916v1 |
2022-07-26 | The Global Existence of Martingale Solutions to Stochastic Compressible Navier-Stokes Equations with Density-dependent Viscosity | The global existence of martingale solutions to the compressible
Navier-Stokes equations driven by stochastic external forces, with
density-dependent viscosity and vacuum, is established in this paper. This work
can be regarded as a stochastic version of the deterministic Navier-Stokes
equations \cite{Vasseur-Yu2016} (... | 2207.12835v5 |
2022-08-10 | Phonon renormalization effects accompanying the 6 K anomaly in the Quantum Spin Liquid Candidate $κ$-(BEDT-TTF)$_{2}$Cu$_{2}$(CN)$_{3}$ | The low-temperature state of the quantum spin liquid candidate
$\kappa$-(BEDT-TTF)$_{2}$Cu$_{2}$(CN)$_{3}$ emerges via an anomaly at
$T^{*}\sim6$ K. Although signatures of this anomaly have been revealed in
various quantities, its origin has remained unclear. Here we report inelastic
neutron scattering measurements on ... | 2208.05096v2 |
2022-08-16 | Particle dynamics on torsional galilean spacetimes | We study free particle motion on homogeneous kinematical spacetimes of
galilean type. The three well-known cases of Galilei and (A)dS--Galilei
spacetimes are included in our analysis, but our focus will be on the
previously unexplored torsional galilean spacetimes. We show how in well-chosen
coordinates free particle m... | 2208.07611v2 |
2022-08-17 | Linking fluctuation and dissipation in spatially extended out-of-equilibrium systems | For systems in equilibrium at a temperature $T$, thermal noise and energy
damping are related to $T$ through the fluctuation-dissipation theorem (FDT).
We study here an extension of the FDT to an out of equilibrium steady state: a
microcantilever subject to a constant heat flux. The resulting thermal profile
in this sp... | 2208.08356v2 |
2022-08-27 | Quantum Langevin Equation of a spin in a magnetic field : an analysis | We derive a quantum Langevin equation for a quantum spin in the presence of a
magnetic field and study its dynamics in the Markovian limit using the Ohmic
bath model. We extend our analysis to the Drude bath with a finite memory. We
study the time evolution of the expectation values of the magnetic moments. The
spin au... | 2208.12989v1 |
2022-09-01 | \textit{Ab initio} study on spin fluctuations of itinerant kagome magnet FeSn | Kagome antiferromagnetic metal FeSn has become an attracting platform for the
exploration of novel electronic states, such as topological Dirac states and
the formation of flat bands by localized electrons. Apart from the electronic
properties, Dirac magnons and flat magnon bands have also been proposed by
applying sim... | 2209.00187v1 |
2022-09-01 | Comment on "Damping of neutrino oscillations, decoherence and the lengths of neutrino wave packets'' | We point out three apparent inconsistencies in the treatment of oscillation
coherence from reactor neutrino and source neutrino experiments in recent paper
"Damping of neutrino oscillations, decoherence and the lengths of neutrino wave
packets''. First, that the dependence of the oscillation probability upon the
subseq... | 2209.00561v1 |
2022-09-02 | The thermal-orbital evolution of the Earth-Moon system with a subsurface magma ocean and fossil figure | Various theories have been proposed to explain the Moon's current inclined
orbit. We test the viability of these theories by reconstructing the
thermal-orbital history of the Moon. We build on past thermal-orbital models
and incorporate the evolution of the lunar figure including a fossil figure
component. Obliquity ti... | 2209.00935v1 |
2022-09-05 | A new T-compatibility condition and its application to the discretization of the damped time-harmonic Galbrun's equation | We consider the approximation of weakly T-coercive operators. The main
property to ensure the convergence thereof is the regularity of the
approximation (in the vocabulary of discrete approximation schemes). In a
previous work the existence of discrete operators $T_n$ which converge to $T$
in a discrete norm was shown ... | 2209.01878v2 |
2022-09-06 | Suppressing Amplitude Damping in Trapped Ions: Discrete Weak Measurements for a Non-unitary Probabilistic Noise Filter | The idea of exploiting maximally-entangled states as a resource lies at the
core of several modalities of quantum information processing, including secure
quantum communication, quantum computation, and quantum sensing. However, due
to imperfections during or after the entangling gates used to prepare such
states, the ... | 2209.02753v1 |
2022-09-07 | Classical correlations for Generic States are Fragile under Decoherence | Quantum correlations typically decrease with increasing noise, although
classical correlators (CCors) may rise for a particular class of states with
noise. To analyse the behavior of classical correlation (CC) in the presence of
local noise, we scrutinize the set of classical correlators, axiomatic CC
measures like cla... | 2209.03334v1 |
2022-09-10 | Bulk Viscosity of Relativistic $npeμ$ Matter in Neutron-Star Mergers | We discuss the bulk viscosity of hot and dense $npe\mu$ matter arising from
weak-interaction direct Urca processes. We consider two regimes of interest:
(a) the neutrino-transparent regime with $T\leq T_{\rm tr}$ ($T_{\rm tr}\simeq
5\div 10$ MeV is the neutrino-trapping temperature); and (b) the
neutrino-trapped regime... | 2209.04717v1 |
2022-09-11 | Approximation of Algebraic Riccati Equations with Generators of Noncompact Semigroups | In this work, we demonstrate that the Bochner integral representation of the
Algebraic Riccati Equations (ARE) are well-posed without any compactness
assumptions on the coefficient and semigroup operators. From this result, we
then are able to determine that, under some assumptions, the solution to the
Galerkin approxi... | 2209.04769v5 |
2022-09-11 | Toward a Framework for Adaptive Impedance Control of an Upper-limb Prosthesis | Adapting upper-limb impedance (i.e., stiffness, damping, inertia) is
essential for humans interacting with dynamic environments for executing
grasping or manipulation tasks. On the other hand, control methods designed for
state-of-the-art upper-limb prostheses infer motor intent from surface
electromyography (sEMG) sig... | 2209.04937v2 |
2022-09-14 | Time rescaling of a primal-dual dynamical system with asymptotically vanishing damping | In this work, we approach the minimization of a continuously differentiable
convex function under linear equality constraints by a second-order dynamical
system with an asymptotically vanishing damping term. The system under
consideration is a time rescaled version of another system previously found in
the literature. ... | 2209.06438v1 |
2022-09-18 | Numerical Approximations for the Null Controllers of Structurally Damped Plate Dynamics | In this paper, we consider a structurally damped elastic equation under
hinged boundary conditions. Fully-discrete numerical approximation schemes are
generated for the null controllability of these parabolic-like PDEs. We mainly
use finite element method (FEM) and finite difference method (FDM)
approximations to show ... | 2209.08486v1 |
2022-09-19 | Calculating quasinormal modes of Schwarzschild anti-de Sitter black holes using the continued fraction method | We investigate the scalar, gravitational, and electromagnetic quasinormal
mode spectra of Schwarzschild anti-de Sitter black holes using the numerical
continued fraction method. The spectra have similar, almost linear structures.
With a few exceptions, the low overtone quasinormal modes are consistent with
previously o... | 2209.09324v3 |
2022-09-20 | Study of the Global Alignment for the DAMPE Detector | The Dark Matter Particle Explorer (DAMPE) is designed as a high energy
particle detector for probing cosmic-rays and $\gamma-$rays in a wide energy
range. The trajectory of the incident particle is mainly measured by the
Silicon-Tungsten tracKer-converter (STK) sub-detector, which heavily depends on
the precise interna... | 2209.09440v1 |
2022-09-22 | Open quantum system dynamics of $X$-states: Entanglement sudden death and sudden birth | The origin of disentanglement for two specific sub-classes of $X$-states
namely maximally nonlocal mixed states (MNMSs) and maximally entangled mixed
states (MEMSs) is investigated analytically for a physical system consisting of
two spatially separated qubits interacting with a common vacuum bath. The
phenomena of ent... | 2209.11190v1 |
2022-09-23 | Kernel-based quantum regressor models learn non-Markovianity | Quantum machine learning is a growing research field that aims to perform
machine learning tasks assisted by a quantum computer. Kernel-based quantum
machine learning models are paradigmatic examples where the kernel involves
quantum states, and the Gram matrix is calculated from the overlap between
these states. With ... | 2209.11655v1 |
2022-09-24 | Reflectionless Programmable Signal Routers | We demonstrate experimentally that reflectionless scattering modes (RSMs), a
generalized version of coherent perfect absorption, can be functionalized to
perform reflectionless programmable signal routing. We achieve versatile
programmability both in terms of operating frequencies and routing
functionality with negligi... | 2209.11991v1 |
2022-09-30 | A simple analytical expression of quantum Fisher and Skew information and their dynamics under decoherence channels | In statistical estimation theory, it has been shown previously that the
Wigner-Yanase skew information is bounded by the quantum Fisher information
associated with the phase parameter. Besides, the quantum Cram\'er-Rao
inequality is expressed in terms of skew information. Since these two
fundamental quantities are base... | 2209.15593v2 |
2022-10-03 | Voltage control of frequency, effective damping and threshold current in nano-constriction-based spin Hall nano-oscillators | Using micromagnetic simulations, we study the interplay between strongly
voltage-controlled magnetic anisotropy (VCMA), $\Delta K = \pm$200 kJ/m$^3$,
and gate width, $w=$ 10--400 nm, in voltage-gated W/CoFeB/MgO based
nano-constriction spin Hall nano-oscillators. The VCMA modifies the local
magnetic properties such tha... | 2210.01042v1 |
2022-10-18 | Evidence of fresh cosmic ray in galactic plane based on DAMPE measurement of B/C and B/O ratios | More and more experiments have identified that the energy spectra of both
primary and secondary cosmic-rays exhibit a hardening above $\sim 200$ GV. Most
recently, the DAMPE experiment has reported a hardening of boron-to-carbon
ratio at $200$ GV. These signs call for modifications of the conventional
cosmic-ray (CR) p... | 2210.09591v2 |
2022-10-19 | Global well-posedness of the partially damped 2D MHD equations via a direct normal mode method for the anisotropic linear operator | We prove the global well-posedness of the 2D incompressible non-resistive MHD
equations with a velocity damping term near the non-zero constant background
magnetic field. To this end, we newly design a normal mode method of
effectively leveraging the anisotropy of the linear propagator that encodes
both the partially d... | 2210.10283v1 |
2022-10-19 | Design and Modeling of a PVDF-TrFe Flexible Wind Energy Harvester | This study presents the simulation, experimentation, and design
considerations of a Poly(vinylidene fluoride co-trifluoroethylene)/
Polyethylene Terephthalate (PVDF-TrFe / PET), laser-cut, flexible piezoelectric
energy harvester. It is possible to obtain energy from the environment around
autonomous sensor systems, whi... | 2210.10540v1 |
2022-10-20 | Parameter analysis in continuous data assimilation for three-dimensional Brinkman-Forchheimer-extended Darcy | In this paper, we study analytically the long-time behavior of
three-dimensional Brinkman-Forchheimer-extended Darcy model, in the context
that the parameters related to the damping nonlinear term are unknown. This
work is inspired by the approach firstly introduced for two-dimensional
Navier-Stokes equations by Carlso... | 2210.11432v1 |
2022-10-21 | Breathers in lattices with alternating strain-hardening and strain-softening interactions | This work focuses on the study of time-periodic solutions, including
breathers, in a nonlinear lattice consisting of elements whose contacts
alternate between strain-hardening and strain-softening. The existence,
stability, and bifurcation structure of such solutions, as well as the system
dynamics in the presence of d... | 2210.11690v1 |
2022-10-28 | Two novel families of multiscale staggered patch schemes efficiently simulate large-scale, weakly damped, linear waves | Many multiscale wave systems exhibit macroscale emergent behaviour, for
example, the fluid dynamics of floods and tsunamis. Resolving a large range of
spatial scales typically requires a prohibitively high computational cost. The
small dissipation in wave systems poses a significant challenge to further
developing mult... | 2210.15823v1 |
2022-11-07 | On Vacuum Free Boundary Problem of the Spherically Symmetric Euler Equations with Damping and Solid Core | In this paper, the global existence of smooth solution and the long-time
asymptotic stability of the equilibrium to vacuum free boundary problem of the
spherically symmetric Euler equations with damping and solid core have been
obtained for arbitrary finite positive gas constant $A$ in the state equation
$p=A \rho^\gam... | 2211.03347v2 |
2022-11-07 | A role of potential on L^{2}-estimates for some evolution equations | In this papwe we consider an effective role of the potential of the wave
equations with/without damping on the L^{2}-estimate of the solution itself. In
the free wave equation case it is known that the L^{2}-norm of the solution
itself generally grows to infinity (as time goes to infinity) in the one and
two dimensiona... | 2211.03389v1 |
2022-11-08 | Cost-optimal adaptive iterative linearized FEM for semilinear elliptic PDEs | We consider scalar semilinear elliptic PDEs where the nonlinearity is
strongly monotone, but only locally Lipschitz continuous. We formulate an
adaptive iterative linearized finite element method (AILFEM) which steers the
local mesh refinement as well as the iterative linearization of the arising
nonlinear discrete equ... | 2211.04123v2 |
2022-11-11 | Radiation reaction effects in relativistic plasmas -- the electrostatic limit | We study the evolution of electrostatic plasma waves, using the relativistic
Vlasov equation extended by the Landau-Lifshitz radiation reaction, accounting
for the back-reaction due to the emission of single particle Larmor radiation.
In particular, the Langmuir wave damping is calculated as a function of
wavenumber, i... | 2211.06240v1 |
2022-11-15 | Limits of the phonon quasi-particle picture at the cubic-to-tetragonal phase transition in halide perovskites | The soft modes associated with continuous-order phase transitions are
associated with strong anharmonicity. This leads to the overdamped limit where
the phonon quasi-particle picture can breakdown. However, this limit is
commonly restricted to a narrow temperature range, making it difficult to
observe its signature fea... | 2211.08197v2 |
2022-11-16 | Endemic Oscillations for SARS-CoV-2 Omicron -- A SIRS model analysis | The SIRS model with constant vaccination and immunity waning rates is well
known to show a transition from a disease-free to an endemic equilibrium as the
basic reproduction number $r_0$ is raised above threshold. It is shown that
this model maps to Hethcote's classic endemic model originally published in
1973. In this... | 2211.09005v2 |
2022-11-18 | Accelerated gradient methods with strong convergence to the minimum norm minimizer: a dynamic approach combining time scaling, averaging, and Tikhonov regularization | In a Hilbert framework, for convex differentiable optimization, we consider
accelerated gradient methods obtained by combining temporal scaling and
averaging techniques with Tikhonov regularization. We start from the continuous
steepest descent dynamic with an additional Tikhonov regularization term whose
coefficient v... | 2211.10140v1 |
2022-12-15 | DAMP: Doubly Aligned Multilingual Parser for Task-Oriented Dialogue | Modern virtual assistants use internal semantic parsing engines to convert
user utterances to actionable commands. However, prior work has demonstrated
that semantic parsing is a difficult multilingual transfer task with low
transfer efficiency compared to other tasks. In global markets such as India
and Latin America,... | 2212.08054v2 |
2022-12-21 | Global existence and Blow-up for the 1D damped compressible Euler equations with time and space dependent perturbation | In this paper, we consider the 1D Euler equation with time and space
dependent damping term $-a(t,x)v$. It has long been known that when $a(t,x)$ is
a positive constant or $0$, the solution exists globally in time or blows up in
finite time, respectively. We prove that those results are invariant with
respect to time a... | 2212.11072v2 |
2022-12-22 | Bayesian Physics-Informed Neural Networks for Robust System Identification of Power Systems | This paper introduces for the first time, to the best of our knowledge, the
Bayesian Physics-Informed Neural Networks for applications in power systems.
Bayesian Physics-Informed Neural Networks (BPINNs) combine the advantages of
Physics-Informed Neural Networks (PINNs), being robust to noise and missing
data, with Bay... | 2212.11911v1 |
2022-12-29 | Scheduling of Software-Defined Microgrids for Optimal Frequency Regulation | Integrated with a high share of Inverter-Based Resources (IBRs), microgrids
face increasing complexity of frequency dynamics, especially after
unintentional islanding from the maingrid. These IBRs, on the other hand,
provide more control flexibility to shape the frequency dynamics of microgrid
and together with advance... | 2212.14250v3 |
2023-01-01 | Blow-up of a structural acoustics model | This article studies the finite time blow-up of weak solutions to a
structural acoustics model consisting of a semilinear wave equation defined on
a bounded domain $\Omega\subset\mathbb{R}^3$ which is strongly coupled with a
Berger plate equation acting on the elastic wall, namely, a flat portion of the
boundary. The s... | 2301.00485v1 |
2023-01-03 | Spin-orbit torque for field-free switching in C_{3v} crystals | Spin-orbit torques in noncentrosymmetric polycrystalline magnetic
heterostructures are usually described in terms of field-like and damping-like
torques. However, materials with a lower symmetry point group can exhibit
torques whose behavior substantially deviates from the conventional ones. In
particular, based on sym... | 2301.01133v2 |
2023-01-06 | A Deep Reinforcement Learning-Based Controller for Magnetorheological-Damped Vehicle Suspension | This paper proposes a novel approach to controller design for MR-damped
vehicle suspension system. This approach is predicated on the premise that the
optimal control strategy can be learned through real-world or simulated
experiments utilizing a reinforcement learning algorithm with continuous
states/actions. The sens... | 2301.02714v2 |
2023-01-07 | Quantization of the Bateman damping system with conformable derivative | In this work, the conformable Bateman Lagrangian for the damped harmonic
oscillator system is proposed using the conformable derivative concept. In
other words, the integer derivatives are replaced by conformable derivatives of
order $\alpha$ with $0<\alpha\leq 1$. The corresponding conformable
Euler-Lagrange equations... | 2301.02769v1 |
2023-01-17 | Taking advantage of noise in quantum reservoir computing | The biggest challenge that quantum computing and quantum machine learning are
currently facing is the presence of noise in quantum devices. As a result, big
efforts have been put into correcting or mitigating the induced errors. But,
can these two fields benefit from noise? Surprisingly, we demonstrate that
under some ... | 2301.06814v3 |
2023-01-18 | Damping versus oscillations for a gravitational Vlasov-Poisson system | We consider a family of isolated inhomogeneous steady states to the
gravitational Vlasov-Poisson system with a point mass at the centre. They are
parametrised by the polytropic index $k>1/2$, so that the phase space density
of the steady state is $C^1$ at the vacuum boundary if and only if $k>1$. We
prove the following... | 2301.07662v1 |
2023-01-22 | Magnon bundle in a strongly dissipative magnet | Hybrid quantum systems based on magnetic platforms have witnessed the birth
and fast development of quantum spintronics. Until now, most of the studies
rely on magnetic excitations in low-damping magnetic insulators, particularly
yttrium iron garnet, while a large class of magnetic systems is ruled out in
this interdis... | 2301.09095v1 |
2023-01-24 | Effect of mesonic off-shell correlations in the PNJL equation of state | We study the meson contribution to the equation of state of the 2-flavor PNJL
model, including the full momentum dependence of the meson polarization loops.
Within the Beth-Uhlenbeck approach, we demonstrate that the contribution from
the quark-antiquark continuum excitations in the spacelike region $\omega^2 -
q^2 < 0... | 2301.09882v1 |
2023-01-28 | A speed restart scheme for a dynamics with Hessian driven damping | In this paper, we analyze a speed restarting scheme for the dynamical system
given by $$ \ddot{x}(t) + \dfrac{\alpha}{t}\dot{x}(t) + \nabla \phi(x(t)) +
\beta \nabla^2 \phi(x(t))\dot{x}(t)=0, $$ where $\alpha$ and $\beta$ are
positive parameters, and $\phi:\mathbb{R}^n \to \mathbb{R}$ is a smooth convex
function. If $\... | 2301.12240v1 |
2023-01-31 | Force moment partitioning and scaling analysis of vortices shed by a 2D pitching wing in quiescent fluid | We experimentally study the dynamics and strength of vortices shed from a
NACA 0012 wing undergoing sinusoidal pitching in quiescent water. We
characterize the temporal evolution of the vortex trajectory and circulation
over a range of pitching frequencies, amplitudes and pivot locations. By
employing a physics-based f... | 2301.13373v2 |
2023-02-13 | A damped elastodynamics system under the global injectivity condition: Local wellposedness in $L^p$-spaces | The purpose of this paper is to model mathematically mechanical aspects of
cardiac tissues. The latter constitute an elastic domain whose total volume
remains constant. The time deformation of the heart tissue is modeled with the
elastodynamics equations dealing with the displacement field as main unknown.
These equati... | 2302.06327v2 |
2023-02-16 | Energy decay for wave equations with a potential and a localized damping | We consider the total energy decay together with L^2-bound of the solution
itself of the Cauchy problem for wave equations with a localized damping and a
short-range potential. We treat it in the one dimensional Euclidean space R. We
adopt a simple multiplier method to study them. In this case, it is essential
that the... | 2302.08114v1 |
2023-02-24 | An Oscillation-free Spectral Volume Method for Hyperbolic Conservation Laws | In this paper, an oscillation-free spectral volume (OFSV) method is proposed
and studied for the hyperbolic conservation laws. The numerical scheme is
designed by introducing a damping term in the standard spectral volume method
for the purpose of controlling spurious oscillations near discontinuities.
Based on the con... | 2302.12412v1 |
2023-03-01 | Event-triggered boundary damping of a linear wave equation | This article presents an analysis of the stabilization of a multidimensional
partial differential wave equation under a well designed event-triggering
mechanism that samples the boundary control input. The wave equation is set in
a bounded domain and the control is performed through a boundary classical
damping term, w... | 2303.00381v1 |
2023-03-05 | Coupling of magnetism and Dirac fermions in YbMnSb2 | We report inelastic neutron scattering measurements of magnetic excitations
in YbMnSb2, a low-carrier-density Dirac semimetal in which the
antiferromagnetic Mn layers are interleaved with Sb layers that host Dirac
fermions. We observe a considerable broadening of spin waves, which is
consistent with substantial spin fe... | 2303.02587v2 |
2023-03-08 | Initial value formulation of a quantum damped harmonic oscillator | The in-in formalism and its influence functional generalization are widely
used to describe the out-of-equilibrium dynamics of unitary and open quantum
systems, respectively. In this paper, we build on these techniques to develop
an effective theory of a quantum damped harmonic oscillator and use it to study
initial st... | 2303.04829v1 |
2023-03-17 | Stochastic wave equations with constraints: well-posedness and Smoluchowski-Kramers diffusion approximation | We investigate the well-posedness of a class of stochastic second-order in
time damped evolution equations in Hilbert spaces, subject to the constraint
that the solution lie within the unitary sphere. Then, we focus on a specific
example, the stochastic damped wave equation in a bounded domain of a
$d$-dimensional Eucl... | 2303.09717v2 |
2023-03-21 | Entropically damped artificial compressibility for the discretization corrected particle strength exchange method in incompressible fluid mechanics | We present a consistent mesh-free numerical scheme for solving the
incompressible Navier-Stokes equations. Our method is based on entropically
damped artificial compressibility for imposing the incompressibility constraint
explicitly, and the Discretization-Corrected Particle Strength Exchange
(DC-PSE) method to consis... | 2303.11983v2 |
2023-03-30 | Superfluid $^3$He-B Surface States in a Confined Geometry Probed by a Microelectromechanical Oscillator | A microelectromechanical oscillator with a 0.73 $\mu$m gap structure is
employed to probe the surface Andreev bound states in superfluid $^3$He-B. The
surface specularity of the oscillator is increased by preplating it with 1.6
monolayers of $^4$He. In the linear regime, the temperature dependence of the
damping coeffi... | 2303.17073v1 |
2023-04-04 | A damped Kačanov scheme for the numerical solution of a relaxed p(x)-Poisson equation | The focus of the present work is the (theoretical) approximation of a
solution of the p(x)-Poisson equation. To devise an iterative solver with
guaranteed convergence, we will consider a relaxation of the original problem
in terms of a truncation of the nonlinearity from below and from above by using
a pair of positive... | 2304.01566v1 |
2023-04-05 | Optomechanical coupling and damping of a carbon nanotube quantum dot | Carbon nanotubes are excellent nano-electromechanical systems, combining high
resonance frequency, low mass, and large zero-point motion. At cryogenic
temperatures they display high mechanical quality factors. Equally they are
outstanding single electron devices with well-known quantum levels and have
been proposed for... | 2304.02748v3 |
2023-04-12 | Micromagnetics simulations and phase transitions of ferromagnetics with Dzyaloshinskii-Moriya interaction | Magnetic skyrmions widely exist in a diverse range of magnetic systems,
including chiral magnets with a non-centrosymmetric structure characterized by
Dzyaloshinkii-Moriya interaction~(DMI). In this study, we propose a generalized
semi-implicit backward differentiation formula projection method, enabling the
simulation... | 2304.05789v1 |
2023-04-12 | Abstract damped wave equations: The optimal decay rate | The exponential decay rate of the semigroup $S(t)=e^{t\mathbb{A}}$ generated
by the abstract damped wave equation $$\ddot u + 2f(A) \dot u +A u=0 $$ is here
addressed, where $A$ is a strictly positive operator. The continuous function
$f$, defined on the spectrum of $A$, is subject to the constraints $$\inf
f(s)>0\qqua... | 2304.05816v1 |
2023-04-28 | Primal-Dual Damping algorithms for optimization | We propose an unconstrained optimization method based on the well-known
primal-dual hybrid gradient (PDHG) algorithm. We first formulate the optimality
condition of the unconstrained optimization problem as a saddle point problem.
We then compute the minimizer by applying generalized primal-dual hybrid
gradient algorit... | 2304.14574v2 |
2023-05-01 | Global existence and optimal decay of solutions to the incompressible Oldroyd-B model with only stress tensor dissipation and without damping mechanism | We study the $d$-dimensional ($d\geq2$) incompressible Oldroyd-B model with
only stress tensor diffusion and without velocity dissipation as well as the
damping mechanism on the stress tensor. Firstly, based upon some new
observations on the model, we develope the pure energy argument (independent of
spectral analysis)... | 2305.00839v3 |
2023-05-02 | Non-Markovian quantum interconnect formed by a surface plasmon polariton waveguide | Allowing the generation of effective interactions between distant quantum
emitters (QEs) via flying photons, quantum interconnect (QI) is essentially a
light-matter interface and acts as a building block in quantum technologies. A
surface plasmon polariton (SPP) supported by a metallic waveguide provides an
ideal inter... | 2305.01156v2 |
2023-05-17 | Stationary solutions for the nonlinear Schrödinger equation | We construct stationary statistical solutions of a deterministic unforced
nonlinear Schr\"odinger equation, by perturbing it by a linear damping $\gamma
u$ and a stochastic force whose intensity is proportional to $\sqrt \gamma$,
and then letting $\gamma\to 0^+$. We prove indeed that the family of stationary
solutions ... | 2305.10393v1 |
2023-05-22 | Sketch-and-Project Meets Newton Method: Global $\mathcal O(k^{-2})$ Convergence with Low-Rank Updates | In this paper, we propose the first sketch-and-project Newton method with
fast $\mathcal O(k^{-2})$ global convergence rate for self-concordant
functions. Our method, SGN, can be viewed in three ways: i) as a
sketch-and-project algorithm projecting updates of Newton method, ii) as a
cubically regularized Newton ethod i... | 2305.13082v2 |
2023-05-26 | Energetic cost for speedy synchronization in non-Hermitian quantum dynamics | Quantum synchronization is crucial for understanding complex dynamics and
holds potential applications in quantum computing and communication. Therefore,
assessing the thermodynamic resources required for finite-time synchronization
in continuous-variable systems is a critical challenge. In the present work, we
find th... | 2305.16560v1 |
2023-05-31 | Viscous damping in weltering motion of trapped hydrodynamic dipolar Fermi gases | We consider collective motion and damping of dipolar Fermi gases in the
hydrodynamic regime. We investigate the trajectories of collective oscillations
-- here dubbed ``weltering'' motions -- in cross-dimensional rethermalization
experiments via Monte Carlo simulations, where we find stark differences from
the dilute r... | 2306.00250v1 |
2023-06-01 | Interferometry of Efimov states in thermal gases by modulated magnetic fields | We demonstrate that an interferometer based on modulated magnetic field
pulses enables precise characterization of the energies and lifetimes of Efimov
trimers irrespective of the magnitude and sign of the interactions in 85Rb
thermal gases. Despite thermal effects, interference fringes develop when the
dark time betwe... | 2306.01199v3 |
2023-06-06 | Convergence analysis of nonconform $H(\operatorname{div})$-finite elements for the damped time-harmonic Galbrun's equation | We consider the damped time-harmonic Galbrun's equation, which is used to
model stellar oscillations. We introduce a discontinuous Galerkin finite
element method (DGFEM) with $H(\operatorname{div})$-elements, which is
nonconform with respect to the convection operator. We report a convergence
analysis, which is based o... | 2306.03496v1 |
2023-06-06 | Plasmons for the Hartree equations with Coulomb interaction | In this work, we establish the existence and decay of {\em plasmons}, the
quantum of Langmuir's oscillatory waves found in plasma physics, for the
linearized Hartree equations describing an interacting gas of infinitely many
fermions near general translation-invariant steady states, including compactly
supported Fermi ... | 2306.03800v1 |
2023-06-10 | Discrepant Approaches to Modeling Stellar Tides, and the Blurring of Pseudosynchronization | We examine the reasons for discrepancies between two alternative approaches
to modeling small-amplitude tides in binary systems. The 'direct solution' (DS)
approach solves the governing differential equations and boundary conditions
directly, while the 'modal decomposition' (MD) approach relies on a normal-mode
expansi... | 2306.06429v1 |
2023-06-19 | Spin transport and magnetic proximity effect in CoFeB/normal metal/Pt trilayers | We present a study of the damping and spin pumping properties of CoFeB/X/Pt
systems with $\rm X=Al,Cr$ and $\rm Ta$. We show that the total damping of the
CoFeB/Pt systems is strongly reduced when an interlayer is introduced
independently of the material. Using a model that considers spin relaxation, we
identify the or... | 2306.11009v2 |
2023-06-23 | Energy-optimal control of adaptive structures | Adaptive structures are equipped with sensors and actuators to actively
counteract external loads such as wind. This can significantly reduce resource
consumption and emissions during the life cycle compared to conventional
structures. A common approach for active damping is to derive a
port-Hamiltonian model and to em... | 2306.13331v2 |
2023-06-23 | Low-Lying Collective Excitations of Superconductors and Charged Superfluids | We investigate theoretically the momentum-dependent frequency and damping of
low-lying collective excitations of superconductors and charged superfluids in
the BCS-BEC crossover regime. The study is based on the Gaussian
pair-and-density fluctuation method for the propagator of Gaussian fluctuations
of the pair and den... | 2306.13393v1 |
2023-06-27 | On Nonlinear Scattering of Drift Wave by Toroidal Alfven Eigenmode in Tokamak Plasmas | Using electron drift wave (eDW) as a paradigm model, we have investigated
analytically direct wave-wave interactions between a test DW and ambient
toroidal Alfv\'en eigenmodes (TAE) in toroidal plasmas, and their effects on
the stability of the eDW. The nonlinear effects enter via scatterings to
short-wavelength electr... | 2306.15238v1 |
2023-06-27 | Ground-state cooling of a mechanical oscillator by heating | Dissipation and the accompanying fluctuations are often seen as detrimental
for quantum systems, since they are associated with fast relaxation and loss of
phase coherence. However, it has been proposed that a pure state can be
prepared if external noise induces suitable downwards transitions, while
exciting transition... | 2306.15746v1 |
2023-07-07 | Tikhonov regularized second-order plus first-order primal-dual dynamical systems with asymptotically vanishing damping for linear equality constrained convex optimization problems | In this paper, in the setting of Hilbert spaces, we consider a Tikhonov
regularized second-order plus first-order primal-dual dynamical system with
asymptotically vanishing damping for a linear equality constrained convex
optimization problem. The convergence properties of the proposed dynamical
system depend heavily u... | 2307.03612v1 |
2023-07-14 | The Effects of Viscosity on the Linear Stability of Damped Stokes Waves, Downshifting, and Rogue Wave Generation | We investigate a higher order nonlinear Schr\"odinger equation with linear
damping and weak viscosity, recently proposed as a model for deep water waves
exhibiting frequency downshifting. Through analysis and numerical simulations,
we discuss how the viscosity affects the linear stability of the Stokes wave
solution, e... | 2307.07156v2 |
2023-07-17 | Tidal excitation of the obliquity of Earth-like planets in the habitable zone of M-dwarf stars | Close-in planets undergo strong tidal interactions with the parent star that
modify their spins and orbits. In the two-body problem, the final stage for
tidal evolution is the synchronisation of the rotation and orbital periods, and
the alignment of the planet spin axis with the normal to the orbit (zero planet
obliqui... | 2307.08770v1 |
2023-07-19 | A spin-rotation mechanism of Einstein-de Haas effect based on a ferromagnetic disk | Spin-rotation coupling (SRC) is a fundamental phenomenon that connects
electronic spins with the rotational motion of a medium. We elucidate the
Einstein-de Haas (EdH) effect and its inverse with SRC as the microscopic
mechanism using the dynamic spin-lattice equations derived by elasticity theory
and Lagrangian formal... | 2307.10390v1 |
2023-07-20 | Interaction-mitigated Landau damping | Bosonic collective modes are ubiquitous in metals, but over a wide range of
energy and momenta suffer from Landau damping, decaying into the continuum of
particle-hole excitations. Here we point out that interactions can suppress
this decay, protecting a finite fraction of the total spectral weight
associated with the ... | 2307.11169v2 |
2023-07-20 | Electron-positron plasma in BBN: damped-dynamic screening | We characterize in detail the very dense $e^- e^+ \gamma$ plasma present
during the Big-Bang Nucleosynthesis (BBN) and explore how it is perturbed
electromagnetically by \lq\lq impurities, {\it i.e.\/}, spatially dispersed
protons and light nuclei undergoing thermal motion. The internuclear
electromagnetic screened pot... | 2307.11264v2 |
2023-07-22 | Damping of strong GHz waves near magnetars and the origin of fast radio bursts | We investigate how a GHz radio burst emitted near a magnetar propagates
through its magnetosphere at radii $r=10^7$-$10^9$ cm. Bursts propagating near
the magnetic equator behave as magnetohydrodynamic (MHD) waves if they have
luminosity $L\gg 10^{40}$ erg/s. The waves develop plasma shocks in each
oscillation and diss... | 2307.12182v1 |
2023-07-25 | Computational Guarantees for Doubly Entropic Wasserstein Barycenters via Damped Sinkhorn Iterations | We study the computation of doubly regularized Wasserstein barycenters, a
recently introduced family of entropic barycenters governed by inner and outer
regularization strengths. Previous research has demonstrated that various
regularization parameter choices unify several notions of entropy-penalized
barycenters while... | 2307.13370v1 |
2023-07-30 | Energy transfer and radiation in Hamiltonian nonlinear Klein-Gordon equations: general case | In this paper, we consider Klein-Gordon equations with cubic nonlinearity in
three spatial dimensions, which are Hamiltonian perturbations of the linear one
with potential. It is assumed that the corresponding Klein-Gordon operator $B =
\sqrt{-\Delta + V(x) + m^2} $ admits an arbitrary number of possibly degenerate
eig... | 2307.16191v1 |
2023-08-01 | On damping a control system with global aftereffect on quantum graphs | The paper naturally connects theory of quantum graphs, optimal control theory
and theory of functional-differential equations, and gives a new look at
quantum graphs as temporal networks. This means that the variable
parameterizing the edges is associated with time, while each internal vertex
opens several scenarios fo... | 2308.00496v2 |
2023-08-03 | Part II On strong and non uniform stability of locally damped Timoshenko beam: Mathematical corrections to the proof of Theorem 2.2 in the publication referenced as [1] in the bibliography | In part I of the rebuttal (see [2] to the article [1] entitled "Uniform
stabilization for the Timoshenko beam by a locally distributed damping"
published in 2003, in the journal Electronic Journal of Differential Equations,
we prove that Lemma 3.6 and Theorem 3.1 are unproved due to major flaws
(contradictory assumptio... | 2308.01625v1 |
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