publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2020-08-25 | Stability results of coupled wave models with locally memory in a past history framework via non smooth coefficients on the interface | In this paper, we investigate the stabilization of a locally coupled wave
equations with local viscoelastic damping of past history type acting only in
one equation via non smooth coefficients. First, using a general criteria of
Arendt-Batty, we prove the strong stability of our system. Second, using a
frequency domain... | 2008.11596v1 |
2021-04-24 | Convex optimization via inertial algorithms with vanishing Tikhonov regularization: fast convergence to the minimum norm solution | In a Hilbertian framework, for the minimization of a general convex
differentiable function $f$, we introduce new inertial dynamics and algorithms
that generate trajectories and iterates that converge fastly towards the
minimizer of $f$ with minimum norm. Our study is based on the non-autonomous
version of the Polyak h... | 2104.11987v1 |
2021-08-13 | Topology optimization for acoustic structures considering viscous and thermal boundary layers using a sequential linearized Navier-Stokes model | This study proposes a level set-based topology optimization method for
designing acoustic structures with viscous and thermal boundary layers in
perspective. Acoustic waves propagating in a narrow channel are damped by
viscous and thermal boundary layers. To estimate these viscothermal effects, we
first introduce a seq... | 2108.06116v2 |
2021-10-12 | Computing semigroups with error control | We develop an algorithm that computes strongly continuous semigroups on
infinite-dimensional Hilbert spaces with explicit error control. Given a
generator $A$, a time $t>0$, an arbitrary initial vector $u_0$ and an error
tolerance $\epsilon>0$, the algorithm computes $\exp(tA)u_0$ with error bounded
by $\epsilon$. The ... | 2110.06350v1 |
2021-10-16 | Global well-posedness, stability and instability for the non-viscous Oldroyd-B model | In this paper we consider the 3-dimensional incompressible Oldroyd-B model.
First, we establish two results of the global existence for different kinds of
the coupling coefficient $k$. Then, we prove that the solutions $(u,\tau)$ are
globally steady when $k^m\rightarrow k>0$, though $(u,\tau)$ corresponds to
different ... | 2110.08475v1 |
2021-11-01 | Dissipative superfluid relativistic magnetohydrodynamics of a multicomponent fluid: the combined effect of particle diffusion and vortices | We formulate dissipative magnetohydrodynamic equations for finite-temperature
superfluid and superconducting charged relativistic mixtures, taking into
account the effects of particle diffusion and possible presence of
Feynman-Onsager and/or Abrikosov vortices in the system. The equations depend
on a number of phenomen... | 2111.00999v1 |
2021-11-11 | Quasinormal modes of charged black holes with corrections from nonlinear electrodynamics | We study quasinormal modes related to gravitational and electromagnetic
perturbations of spherically symmetric charged black holes in nonlinear
electrodynamics. Beyond the linear Maxwell electrodynamics, we consider a class
of Lagrangian with higher-order corrections written by the electromagnetic
field strength and it... | 2111.06273v2 |
2022-06-29 | Strongly coupled quantum Otto cycle with single qubit bath | We discuss a model of a closed quantum evolution of two-qubits where the
joint Hamiltonian is so chosen that one of the qubits acts as a bath and
thermalize the other qubit which is acting as the system. The corresponding
exact master equation for the system is derived. Interestingly, for a specific
choice of parameter... | 2206.14751v1 |
2022-08-29 | Benchmarking magnetized three-wave coupling for laser backscattering: Analytic solutions and kinetic simulations | Understanding magnetized laser-plasma interactions is important for
controlling magneto-inertial fusion experiments and developing magnetically
assisted radiation and particle sources. In the long-pulse regime, interactions
are dominated by coherent three-wave interactions, whose nonlinear coupling
coefficients become ... | 2208.13832v2 |
2022-09-07 | Acoustic attenuation in magnetic insulator films: effects of magnon polaron formation | A magnon and a phonon are the quanta of spin wave and lattice wave,
respectively, and they can hybridize into a magnon polaron when their
frequencies and wavenumbers match close enough the values at the exceptional
point. Guided by an analytically calculated magnon polaron dispersion,
dynamical phase-field simulations ... | 2209.03481v2 |
2023-02-27 | Diagonal State Space Augmented Transformers for Speech Recognition | We improve on the popular conformer architecture by replacing the depthwise
temporal convolutions with diagonal state space (DSS) models. DSS is a recently
introduced variant of linear RNNs obtained by discretizing a linear dynamical
system with a diagonal state transition matrix. DSS layers project the input
sequence ... | 2302.14120v1 |
2023-03-22 | Invariants for time-dependent Hamiltonian systems | An exact invariant is derived for $n$-degree-of-freedom Hamiltonian systems
with general time-dependent potentials. The invariant is worked out in two
equivalent ways. In the first approach, we define a special {\it Ansatz\/} for
the invariant and determine its time-dependent coefficients. In the second
approach, we pe... | 2303.12746v1 |
2023-04-25 | Room dimensions and absorption inference from room transfer function via machine learning | The inference of the absorption configuration of an existing room solely
using acoustic signals can be challenging. This research presents two methods
for estimating the room dimensions and frequency-dependent absorption
coefficients using room transfer functions. The first method, a knowledge-based
approach, calculate... | 2304.12993v1 |
2023-06-19 | Reciprocal hydrodynamic response estimation in a random spreading sea | Direct estimation of the hydrodynamic response of an offshore structure in a
random spreading sea can lead to large computational costs. In this paper the
actual spreading sea is replaced by an idealised diffuse wave field and the
diffuse field reciprocity (DFR) relationship is derived analytically and
verified against... | 2306.11058v1 |
2023-09-11 | Design of a Freely Rotating Wind Tunnel Test Bench for Measurements of Dynamic Coefficients | The needs to improve performances of artillery projectiles require accurate
aerodynamic investigation methods. The aerodynamic design of a projectile
usually starts from numerical analyses, mostly including semiempirical methods
and/or Computational Fluid Dynamics (CFD), up to experimental techniques
composed of wind-t... | 2309.05302v1 |
2006-02-20 | Fluctuation theorem applied to the Nosé-Hoover thermostated Lorentz gas | We present numerical evidence supporting the validity of the Gallavotti-Cohen
Fluctuation Theorem applied to the driven Lorentz gas with Nos\'e-Hoover
thermostating. It is moreover argued that the asymptotic form of the
fluctuation formula is independent of the amplitude of the driving force, in
the limit where it is s... | 0602458v1 |
1997-12-28 | Model-independent $\tan β$ bounds in the MSSM | We demonstrate, through the study of the one-loop effective potential in the
MSSM, the existence of fully model-independent lower and upper theoretical
bounds on $\tan \beta$. We give their general analytic form and illustrate some
of their implications. | 9712529v1 |
2006-12-26 | Very Light Gravitino Dark Matter | We address the question of dark matter in the context of gauge mediated
supersymmetry breaking models. In contrast with mSUGRA scenarios, the messenger
of the susy breaking to the visible sector can play an important role allowing
a relic gravitino in the $\sim {keV}$ to $10 {MeV}$ mass range to account for
the cold da... | 0612331v1 |
2004-09-15 | Characterizing rigid simplicial actions on trees | We extend Forester's rigidity theorem so as to give a complete
characterization of rigid group actions on trees (an action is rigid if it is
the only reduced action in its deformation space, in particular it is invariant
under automorphisms preserving the set of elliptic subgroups). | 0409245v1 |
2005-12-14 | Efficient Construction of Photonic Quantum Computational Clusters | We demonstrate a method of creating photonic two-dimensional cluster states
that is considerably more efficient than previously proposed approaches. Our
method uses only local unitaries and type-I fusion operations. The increased
efficiency of our method compared to previously proposed constructions is
obtained by iden... | 0512110v1 |
2007-10-26 | The dark matter as a light gravitino | We address the question of gravitino dark matter in the context of gauge
mediated supersymmetry breaking models. A special emphasis is put on the role
played by the MSSM singlet messenger in the case of SO(10) grand unification. | 0710.5121v1 |
2008-03-05 | Innovative Weak Formulation for The Landau-Lifshitz-Gilbert Equations | A non-conventional finite element formalism is proposed to solve the dynamic
Landau-Lifshitz-Gilbert micromagnetic equations. Two bidimensional test
problems are treated to estimate the validity and the accuracy of this finite
element approach | 0803.0599v1 |
2008-10-27 | The profile of bubbling solutions of a class of fourth order geometric equations on 4-manifolds | We study a class of fourth order geometric equations defined on a
4-dimensional compact Riemannian manifold which includes the Q-curvature
equation. We obtain sharp estimates on the difference near the blow-up points
between a bubbling sequence of solutions and the standard bubble. | 0810.4879v1 |
2009-03-02 | Asymptotic Improvement of the Binary Gilbert-Varshamov Bound on the Code Rate | We compute the code parameters for binary linear codes obtained by greedy
constructing the parity check matrix. Then we show that these codes improve the
Gilbert-Varshamov (GV) bound on the code size and rate. This result counter
proves the conjecture on the asymptotical exactness of the binary GV bound. | 0903.0302v2 |
2009-11-16 | The Independent Chip Model and Risk Aversion | We consider the Independent Chip Model (ICM) for expected value in poker
tournaments. Our first result is that participating in a fair bet with one
other player will always lower one's expected value under this model. Our
second result is that the expected value for players not participating in a
fair bet between two p... | 0911.3100v1 |
2011-03-29 | Statistical properties of $r$-adic processes and their connections to families of popular fractal curves | Results concerning the statists of $r$-adic processes and their fractal
properties are reviewed. The connection between singular eigenstates of the
statistical evolution of such processes and popular fractal curves is
emphasized. | 1103.5683v1 |
2011-05-09 | Global Solvability of the Cauchy Problem for the Landau-Lifshitz-Gilbert Equation in Higher Dimensions | We prove existence, uniqueness and asymptotics of global smooth solutions for
the Landau-Lifshitz-Gilbert equation in dimension $n \ge 3$, valid under a
smallness condition of initial gradients in the $L^n$ norm. The argument is
based on the method of moving frames that produces a covariant complex
Ginzburg-Landau equa... | 1105.1597v1 |
2012-03-28 | Fibonacci numbers in phyllotaxis : a simple model | A simple model is presented which explains the occurrence of high order
Fibonacci number parastichies in asteracae flowers by two distinct steps. First
low order parastichies result from the fact that a new floret, at its
appearance is repelled by two former ones, then, in order to accommodate for
the increase of the r... | 1203.6257v1 |
2014-02-19 | Ordered groupoids and the holomorph of an inverse semigroup | We present a construction for the holomorph of an inverse semigroup, derived
from the cartesian closed structure of the category of ordered groupoids. We
compare the holomorph with the monoid of mappings that preserve the ternary
heap operation on an inverse semigroup: for groups these two constructions
coincide. We pr... | 1402.4592v1 |
2014-11-01 | Functorial Zeta Integrals | The functional equation for nonarchimedean Rankin-Selberg local Euler factors
was proved by Jacquet, Piatetski-Shapiro, and Shalika in 1983. In this
expository note we translate the original proof into the purely functorial
language of parabolic induction-restriction of Bernstein-Zelevinsky. This new
language gives a c... | 1411.0148v1 |
2016-02-17 | Dispersion and Scaling Law of Dynamic Hysteresis Based on the Landau-Lifshitz-Gilbert Model | Hysteresis dispersion under a varying external field Hex is investigated
through numerical simulations based on the Landau-Lifshitz-Gilbert (LLG)
equation, indicating the energy dissipation can be determined by W({\eta}) = A
(f, H0). A linear relation between area of hysteresis and magnitude of external
field is discov... | 1602.05375v1 |
2016-06-06 | Proof of tightness of Varshamov - Gilbert bound for binary codes | We prove tightness of right logarithmic asymptotic of Varshamov- Gilbert
bound for linear binary codes We find general asymptotic coding bound for
linear codes | 1606.01592v5 |
2017-02-21 | Cohomology and extensions of ordered groupoids | We adapt and generalise results of Loganathan on the cohomology of inverse
semigroups to the cohomology of ordered groupoids. We then derive a five-term
exact sequence in cohomology from an extension of ordered groupoids, and show
that this sequence leads to a classification of extensions by a second
cohomology group. ... | 1702.06333v1 |
2017-05-11 | Two Gilbert-Varshamov Type Existential Bounds for Asymmetric Quantum Error-Correcting Codes | In this note we report two versions of Gilbert-Varshamov type existential
bounds for asymmetric quantum error-correcting codes. | 1705.04087v2 |
2017-09-21 | Self-Dual Codes better than the Gilbert--Varshamov bound | We show that every self-orthogonal code over $\mathbb F_q$ of length $n$ can
be extended to a self-dual code, if there exists self-dual codes of length $n$.
Using a family of Galois towers of algebraic function fields we show that over
any nonprime field $\mathbb F_q$, with $q\geq 64$, except possibly $q=125$,
there ar... | 1709.07221v1 |
2018-10-12 | A convex approach to the Gilbert-Steiner problem | We describe a convex relaxation for the Gilbert-Steiner problem both in $R^d$
and on manifolds, extending the framework proposed in [9], and we discuss its
sharpness by means of calibration type arguments. The minimization of the
resulting problem is then tackled numerically and we present results for an
extensive set ... | 1810.05417v1 |
2018-11-09 | Finslerian metrics locally conformally $R$-Einstein | Let $R$ be the $hh$-curvature associated with the Chern connection or the
Cartan connection. Adopting the pulled-back tangent bundle approach to the
Finslerian Geometry, an intrinsic characterization of $R$-Einstein metrics is
given. Finslerian metrics which are locally conformally $R$-Einstein are
classified. | 1811.04077v3 |
2019-02-05 | Harmonic maps with prescribed singularities and applications in general relativity | This paper presents a general existence and uniqueness result for harmonic
maps with prescribed singularities into non-positively curved targets, and
surveys a number of applications to general relativity. It is based on a talk
delivered by the author at The 11th Mathematical Society of Japan Seasonal
Institute, The Ro... | 1902.01576v2 |
2020-03-13 | 3D Stochastic Landau-Lifshitz-Gilbert Equations coupled with Maxwell's Equations with full energy | We consider 3D stochastic Landau-Lifshitz-Gilbert equations coupled with the
Maxwell equations with the full energy. We have proved the existence and some
further regularities of the weak solution. | 2003.06091v4 |
2021-12-09 | Induced Semi-Riemannian structures on null submanifolds | In this paper, we induce a semi-Riemannian metric on the $r$-null
submanifold. We establish the links between the null geometry and basics
invariants of the associated semi-Riemannian geometry on $r$-null submanifold
and semi-Riemannian constructed from a semi-Riemannian ambient. | 2112.07348v1 |
2022-04-12 | How to design a network architecture using capacity planning | Building a network architecture must answer to organization needs, but also
to two major elements which are the need for dependability and performance. By
performance, we must understand the ability to meet an immediate need and the
ability to scale without reducing the performance of the whole as new elements
are adde... | 2204.05916v2 |
2022-07-31 | Moduli of Representations of Skewed-Gentle Algebras | We prove irreducible components of moduli spaces of semistable
representations of skewed-gentle algebras, and more generally, clannish
algebras, are isomorphic to products of projective spaces. This is achieved by
showing irreducible components of varieties of representations of clannish
algebras can be viewed as irred... | 2208.00336v1 |
2022-08-01 | iOCR: Informed Optical Character Recognition for Election Ballot Tallies | The purpose of this study is to explore the performance of Informed OCR or
iOCR. iOCR was developed with a spell correction algorithm to fix errors
introduced by conventional OCR for vote tabulation. The results found that the
iOCR system outperforms conventional OCR techniques. | 2208.00865v1 |
2023-03-13 | Adaptive mesh refinement for the Landau-Lifshitz-Gilbert equation | We propose a new adaptive algorithm for the approximation of the
Landau-Lifshitz-Gilbert equation via a higher-order tangent plane scheme. We
show that the adaptive approximation satisfies an energy inequality and
demonstrate numerically, that the adaptive algorithm outperforms uniform
approaches. | 2303.07463v1 |
2023-05-08 | Evaluation of the Gilbert-Varshamov Bound using Multivariate Analytic Combinatorics | Analytic combinatorics in several variables refers to a suite of tools that
provide sharp asymptotic estimates for certain combinatorial quantities. In
this paper, we apply these tools to determine the Gilbert-Varshamov (GV) bound
for the sticky insertion and the constrained-synthesis channel. | 2305.04439v1 |
2023-12-11 | Matrix Formulae and Skein Relations for Quasi-cluster Algebras | In this paper, we give matrix formulae for non-orientable surfaces that
provide the Laurent expansion for quasi-cluster variables, generalizing the
orientable surface matrix formulae by Musiker-Williams. We additionally use our
matrix formulas to prove the skein relations for the elements in the
quasi-cluster algebra a... | 2312.06148v1 |
2009-08-12 | Linear Fractionally Damped Oscillator | In this paper the linearly damped oscillator equation is considered with the
damping term generalized to a Caputo fractional derivative. The order of the
derivative being considered is 0 less than or equal to nu which is less than or
equal to 1 . At the lower end, nu = 0, the equation represents an un-damped
oscillator... | 0908.1683v1 |
1997-10-02 | Dust and elemental abundances in Damped Ly alpha absorbers | The effects of the dust on the determination of elemental abundances in
damped Ly alpha (DLA) absorbers are investigated. Relations between the
observed abundances measured in the gas phase and the overall abundances (gas
plus dust) are derived as a function of dust-to-gas ratio, metallicity,
element-to-element abundan... | 9710026v1 |
2002-11-26 | R-modes of neutron stars with the superfluid core | We investigate the modal properties of the $r$-modes of rotating neutron
stars with the core filled with neutron and proton superfluids, taking account
of entrainment effects between the superfluids. The stability of the $r$-modes
against gravitational radiation reaction is also examined considering viscous
dissipation... | 0211580v1 |
2006-02-06 | Voigt Profile Fitting to Quasar Absorption Lines: An Analytic Approximation to the Voigt-Hjerting Function | The Voigt-Hjerting function is fundamental in order to correctly model the
profiles of absorption lines imprinted in the spectra of bright background
sources by intervening absorbing systems. In this work we present a simple
analytic approximation to this function in the context of absorption line
profiles of intergala... | 0602124v2 |
2003-10-29 | Superparamagnetism and Spin Glass Dynamics of Interacting Magnetic Nanoparticle Systems | The physical properties of magnetic nanoparticles have been investigated with
focus on the influence of dipolar interparticle interaction. For weakly coupled
nanoparticles, thermodynamic perturbation theory is employed to derive
analytical expressions for the linear equilibrium susceptibility, the
zero-field specific h... | 0310684v2 |
1996-12-31 | Fluid Models for Kinetic Effects on Coherent Nonlinear Alfven Waves. I. Fundamental Theory | Collisionless regime kinetic models for coherent nonlinear Alfven wave
dynamics are studied using fluid moment equations with an approximate closure
anzatz. Resonant particle effects are modelled by incorporating an additional
term representing dissipation akin to parallel heat conduction. Unlike
collisional dissipatio... | 9612017v1 |
2008-06-01 | Ray-based calculations of backscatter in laser fusion targets | A 1D, steady-state model for Brillouin and Raman backscatter from an
inhomogeneous plasma is presented. The daughter plasma waves are treated in the
strong damping limit, and have amplitudes given by the (linear) kinetic
response to the ponderomotive drive. Pump depletion, inverse-bremsstrahlung
damping, bremsstrahlung... | 0806.0045v2 |
2015-07-06 | Fast inertial dynamics and FISTA algorithms in convex optimization. Perturbation aspects | In a Hilbert space setting $\mathcal H$, we study the fast convergence
properties as $t \to + \infty$ of the trajectories of the second-order
differential equation $ \ddot{x}(t) + \frac{\alpha}{t} \dot{x}(t) + \nabla \Phi
(x(t)) = g(t)$, where $\nabla\Phi$ is the gradient of a convex continuously
differentiable functio... | 1507.01367v1 |
2016-02-05 | Combining fast inertial dynamics for convex optimization with Tikhonov regularization | In a Hilbert space setting $\mathcal H$, we study the convergence properties
as $t \to + \infty$ of the trajectories of the second-order differential
equation \begin{equation*}
\mbox{(AVD)}_{\alpha, \epsilon} \quad \quad \ddot{x}(t) + \frac{\alpha}{t}
\dot{x}(t) + \nabla \Phi (x(t)) + \epsilon (t) x(t) =0, \end{equat... | 1602.01973v1 |
2016-02-19 | Resonant absorption and amplification of circularly-polarized waves in inhomogeneous chiral media | It has been found that in the media where the dielectric permittivity
$\epsilon$ or the magnetic permeability $\mu$ is near zero and in transition
metamaterials where $\epsilon$ or $\mu$ changes from positive to negative
values, there occur a strong absorption or amplification of the electromagnetic
wave energy in the ... | 1602.06022v1 |
2018-06-22 | Overcoming obstacles in nonequilibrium holography | We study universal spatial features of certain non-equilibrium steady states
corresponding to flows of strongly correlated fluids over obstacles. This
allows us to predict universal spatial features of far-from-equilibrium
systems, which in certain interesting cases depend cleanly on the hydrodynamic
transport coeffici... | 1806.08655v1 |
2018-06-28 | Optimizing wave-generation and wave-damping in 3D-flow simulations with implicit relaxation-zones | In finite-volume-based flow-simulations with free-surface waves, wave
reflections at the domain boundaries can cause substantial errors in the
results and must therefore be minimized. This can be achieved via `implicit
relaxation zones', but only if the relaxation zone's case-dependent parameters
are optimized. This wo... | 1806.10995v3 |
2018-07-06 | On the use of circulant matrices for the stability analysis of recent weakly compressible SPH methods | In this study, a linear stability analysis is performed for different Weakly
Compressible Smooth Particle Hydrodynamics (WCSPH) methods on a 1D periodic
domain describing an incompressible base flow. The perturbation equation can be
vectorized and written as an ordinary differential equation where the
coefficients are ... | 1807.02315v2 |
2018-08-15 | Pull-in dynamics of overdamped microbeams | We study the dynamics of MEMS microbeams undergoing electrostatic pull-in. At
DC voltages close to the pull-in voltage, experiments and numerical simulations
have reported `bottleneck' behaviour in which the transient dynamics slow down
considerably. This slowing down is highly sensitive to external forces, and so
has ... | 1808.05237v1 |
2019-07-05 | Response solutions to quasi-periodically forced systems, even to possibly ill-posed PDEs, with strong dissipation and any frequency vectors | We consider several models (including both multidimensional ordinary
differential equations (ODEs) and partial differential equations (PDEs),
possibly ill-posed), subject to very strong damping and quasi-periodic external
forcing. We study the existence of response solutions (i.e., quasi-periodic
solutions with the sam... | 1907.02835v1 |
2020-06-23 | Unexpected convergence of lattice Boltzmann schemes | In this work, we study numerically the convergence of the scalar D2Q9 lattice
Boltzmann scheme with multiple relaxation times when the time step is
proportional to the space step and tends to zero. We do this by a combination
of theory and numerical experiment. The classical formal analysis when all the
relaxation para... | 2006.12947v1 |
2020-09-13 | Inertia and feedback parameters adaptive control of virtual synchronous generator | The virtual synchronous generator technology analogs the characteristics of
the synchronous generator via the controller design. It improved the stability
of the grid systems which include the new energy. At the same time, according
to the adjustable characteristics of the virtual synchronous generator
parameters, the ... | 2009.05916v1 |
2021-02-03 | Jerky active matter: a phase field crystal model with translational and orientational memory | Most field theories for active matter neglect effects of memory and inertia.
However, recent experiments have found inertial delay to be important for the
motion of self-propelled particles. A major challenge in the theoretical
description of these effects, which makes the application of standard methods
very difficult... | 2102.02169v1 |
2021-04-23 | Development of Advanced Linearized Gyrokinetic Collision Operators Using a Moment Approach | The derivation and numerical implementation of a linearized version of the
gyrokinetic (GK) Coulomb collision operator (Jorge R. et al., J. Plasma Phys.
85, 905850604 (2019)) and of the widely-used linearized GK Sugama collision
operator (Sugama H. et al., Phys. Plasmas 16, 112503 (2009)) is reported. An
approach based... | 2104.11480v2 |
2021-05-19 | Viscoelasticity and elastocapillarity effects in the impact of drops on a repellent surface | We investigate freely expanding viscoelastic sheets. The sheets are produced
by the impact of drops on a quartz plate covered with a thin layer of liquid
nitrogen that suppresses shear viscous dissipation as a result of the cold
Leidenfrost effect. The time evolution of the sheet is simultaneously recorded
from top and... | 2105.09244v1 |
2021-12-29 | Towards First-principle Characterization of Cosmic-ray Transport Coefficients from Multi-scale Kinetic Simulations | A major uncertainty in understanding the transport and feedback of
cosmic-rays (CRs) within and beyond our Galaxy lies in the unknown CR
scattering rates, which are primarily determined by wave-particle interaction
at microscopic gyro-resonant scales. The source of the waves for the bulk CR
population is believed to be... | 2112.14782v2 |
2022-01-17 | Sizing of Energy Storage System for Virtual Inertia Emulation | The infusion of renewable energy sources into the conventional synchronous
generation system decreases the overall system inertia and negatively impacts
the stability of its primary frequency response. The lowered inertia is due to
the absence of inertia in some of the renewable energy-based systems. To
maintain the st... | 2201.06566v2 |
2022-04-12 | The drag exerted by weakly dissipative trapped lee waves on the atmosphere: application to Scorer's two-layer model | While it is known that trapped lee waves propagating at low levels in a
stratified atmosphere exert a drag on the mountains that generate them, the
distribution of the corresponding reaction force exerted on the atmospheric
mean circulation, defined by the wave momentum flux profiles, has not been
established, because ... | 2204.05858v1 |
2022-08-30 | Hyperon bulk viscosity and $r$-modes of neutron stars | We propose and apply a new parameterization of the modified chiral effective
model to study rotating neutron stars with hyperon cores in the framework of
the relativistic mean-field theory. The inclusion of mesonic cross couplings in
the model has improved the density content of the symmetry energy slope
parameters, wh... | 2208.14436v1 |
2023-02-19 | Non-separable Covariance Kernels for Spatiotemporal Gaussian Processes based on a Hybrid Spectral Method and the Harmonic Oscillator | Gaussian processes provide a flexible, non-parametric framework for the
approximation of functions in high-dimensional spaces. The covariance kernel is
the main engine of Gaussian processes, incorporating correlations that underpin
the predictive distribution. For applications with spatiotemporal datasets,
suitable ker... | 2302.09580v3 |
2023-11-28 | Energy diffusion in weakly interacting chains with fermionic dissipation-assisted operator evolution | Interacting lattice Hamiltonians at high temperature generically give rise to
energy transport governed by the classical diffusion equation; however,
predicting the rate of diffusion requires numerical simulation of the
microscopic quantum dynamics. For the purpose of predicting such transport
properties, computational... | 2311.17148v2 |
2005-03-08 | Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements. IX. Ni XXVI and Ni XXVII for UV and X-ray modeling | The inverse processes of photoionization and electron-ion recombination of
(hnu + Ni XXVI --> Ni XXVII + e and (hnu + Ni XXVII --> Ni XXVIII + e) are
studied using the unified method for the total recombination. The method
subsumes both the radiative and di-electronic recombination processes and
enables self-consistent... | 0503197v1 |
2013-09-12 | Diffusive transport in Weyl semimetals | Diffusion, a ubiquitous phenomenon in nature, is a consequence of particle
number conservation and locality, in systems with sufficient damping. In this
paper we consider diffusive processes in the bulk of Weyl semimetals, which are
exotic quantum materials, recently of considerable interest. In order to do
this, we fi... | 1309.3278v1 |
2018-01-03 | Gravitational Waves in Locally Rotationally Symmetric (LRS) Class II Cosmologies | In this work we consider perturbations of homogeneous and hypersurface
orthogonal cosmological backgrounds with local rotational symmetry (LRS), using
a method based on the 1 + 1 + 2 covariant split of spacetime. The backgrounds,
of LRS class II, are characterised by that the vorticity, the twist of the
2-sheets, and t... | 1801.01147v1 |
2019-04-12 | Phonon hydrodynamics, thermal conductivity and second sound in 2D crystals | Starting from our previous work where we have obtained a system of coupled
integro-differential equations for acoustic sound waves and phonon density
fluctuations in 2D crystals, we derive here the corresponding hydrodynamic
equations and study their consequences as function of temperature and
frequency. These phenomen... | 1904.06327v1 |
2020-12-17 | Surface wave scattering by multiple flexible fishing cage system | A study of the wave dynamics around a multiple fishing cage system is carried
out under the assumption of the linear water wave theory and small-amplitude
wave response. The Fourier--Bessel series expansion of the velocity potential
is derived for regions enclosed under the open-water and cage systems and in
the immedi... | 2012.09522v1 |
2021-01-19 | Role of nucleon-nucleon correlation in transport coefficients and gravitational-wave-driven $r$-mode instability of neutron stars | The thermal conductivity and shear viscosity of dense nuclear matter, along
with the corresponding shear viscosity timescale of canonical neutron stars
(NSs), are investigated, where the effect of Fermi surface depletion (i.e., the
$Z$-factor effect) induced by the nucleon-nucleon correlation are taken into
account. Th... | 2101.07551v1 |
2022-07-12 | Operator growth and Krylov construction in dissipative open quantum systems | Inspired by the universal operator growth hypothesis, we extend the formalism
of Krylov construction in dissipative open quantum systems connected to a
Markovian bath. Our construction is based upon the modification of the
Liouvillian superoperator by the appropriate Lindbladian, thereby following the
vectorized Lanczo... | 2207.05347v3 |
2022-09-27 | Inertio-capillary rebound of a droplet impacting a fluid bath | The rebound of droplets impacting a deep fluid bath is studied both
experimentally and theoretically. Millimetric drops are generated using a
piezoelectric droplet-on-demand generator and normally impact a bath of the
same fluid. Measurements of the droplet trajectory and other rebound metrics
are compared directly to ... | 2209.13276v2 |
2017-06-28 | Generating Log-normal Mock Catalog of Galaxies in Redshift Space | We present a public code to generate a mock galaxy catalog in redshift space
assuming a log-normal probability density function (PDF) of galaxy and matter
density fields. We draw galaxies by Poisson-sampling the log-normal field, and
calculate the velocity field from the linearised continuity equation of matter
fields,... | 1706.09195v2 |
2021-02-22 | Slow-Mode Magnetoacoustic Waves in Coronal Loops | Rapidly decaying long-period oscillations often occur in hot coronal loops of
active regions associated with small (or micro-) flares. This kind of wave
activity was first discovered with the SOHO/SUMER spectrometer from Doppler
velocity measurements of hot emission lines, thus also often called "SUMER"
oscillations. T... | 2102.11376v1 |
2022-05-29 | Modeling the Dynamics of the Coronavirus SARS-CoV-2 Pandemic using Modified SIR Model with the 'Damped-Oscillator' Dynamics of the Effective Reproduction Number | The COVID-19 pandemic has been a great catastrophe that upended human lives
and caused millions of deaths all over the world. The rapid spread of the
virus, with its early-stage exponential growth and subsequent 'waves', caught
many medical professionals and decision-makers unprepared. Even though
epidemiological model... | 2205.14747v1 |
2023-08-03 | Part I: Rebuttal to "Uniform stabilization for the Timoshenko beam by a locally distributed damping" | A paper, entitled "Uniform stabilization for the Timoshenko beam by a locally
distributed damping" was published in 2003, in the journal Electronic Journal
of Differential Equations. Its title concerns exclusively its Section 3,
devoted to the case of equal speeds of propagation and to its main theorem,
namely Theorem ... | 2308.01611v1 |
2023-08-05 | Modulating Spin Current Induced Effective Damping in $β-W/Py$ Heterostructures by a Systematic Variation in Resistivity of the Sputtered Deposited $β-W$ films | Utilizing the spin-induced pumping from a ferromagnet (FM) into a heavy metal
(HM) under the ferromagnetic resonance (FMR) condition, we report an
enhancement in effective damping in $\beta$- W/Py bilayers by systematically
varying resistivity ($\rho_{W}$) of $\beta$-W films. Different resistivity
ranging from 100 $\mu... | 2308.02939v1 |
2004-05-06 | On a theorem of Kac and Gilbert | We prove a general operator theoretic result that asserts that many
multiplicity two selfadjoint operators have simple singular spectrum. | 0405110v1 |
2011-01-05 | Beating the Gilbert-Varshamov Bound for Online Channels | In the online channel coding model, a sender wishes to communicate a message
to a receiver by transmitting a codeword x =(x_1,...,x_n) in {0,1}^n bit by bit
via a channel limited to at most pn corruptions. The channel is online in the
sense that at the ith step the channel decides whether to flip the ith bit or
not and... | 1101.1045v1 |
2014-11-25 | From heavy-tailed Boolean models to scale-free Gilbert graphs | Define the scale-free Gilbert graph based on a Boolean model with
heavy-tailed radius distribution on the $d$-dimensional torus by connecting two
centers of balls by an edge if at least one of the balls contains the center of
the other. We investigate two asymptotic properties of this graph as the size
of the torus ten... | 1411.6824v1 |
2016-03-16 | Recent Results from SPLASH: Chemical Abundances and Kinematics of Andromeda's Stellar Halo | Large scale surveys of Andromeda's resolved stellar populations have
revolutionized our view of this galaxy over the past decade. The combination of
large-scale, contiguous photometric surveys and pointed spectroscopic surveys
has been particularly powerful for discovering substructure and disentangling
the structural ... | 1603.05160v1 |
2017-05-09 | Gilbert's disc model with geostatistical marking | We study a variant of Gilbert's disc model, in which discs are positioned at
the points of a Poisson process in $\mathbb{R}^2$ with radii determined by an
underlying stationary and ergodic random field
$\varphi:\mathbb{R}^2\to[0,\infty)$, independent of the Poisson process. When
the random field is independent of the p... | 1705.03337v2 |
2019-01-30 | Is the mailing Gilbert-Steiner problem convex? | A convexification of the mailing version of the finite Gilbert problem for
optimal networks is introduced. It is ia convex functional on the set of
probability measures subject to the Wasserstein $p-$ metric. The minimizer of
this convex functional is a measure supported in a graph. If this graph is a
tree (i.e contain... | 1901.10924v4 |
2019-11-06 | Phase transitions for chase-escape models on Gilbert graphs | We present results on phase transitions of local and global survival in a
two-species model on Gilbert graphs. At initial time there is an infection at
the origin that propagates on the Gilbert graph according to a continuous-time
nearest-neighbor interacting particle system. The Gilbert graph consists of
susceptible n... | 1911.02622v2 |
2019-12-13 | Distance between Bound Entangled States from Unextendible Product Bases and Separable States | We discuss the use of the Gilbert algorithm to tailor entanglement witnesses
for unextendibleproduct basis bound entangled states (UPB BE states). The
method relies on the fact that an optimalentanglement witness is given by a
plane perpendicular to a line between the reference state, entanglementof which
is to be witn... | 1912.06569v2 |
2020-10-16 | Genome organization: experiments and modelling | This is an introduction to the special issue Genome organization: experiments
and simulations, published in Chromosome Research, volume 25, issue 1 (2017). | 2010.08464v1 |
2023-10-17 | Sparse grid approximation of stochastic parabolic PDEs: The Landau--Lifshitz--Gilbert equation | We show convergence rates for a sparse grid approximation of the distribution
of solutions of the stochastic Landau-Lifshitz-Gilbert equation. Beyond being a
frequently studied equation in engineering and physics, the stochastic
Landau-Lifshitz-Gilbert equation poses many interesting challenges that do not
appear simul... | 2310.11225v2 |
2024-04-04 | Resolving Gilbert's Conjecture: Dimensional Dependencies in Hardy Spaces Valued in Clifford Modules | This article provides a thorough investigation into Gilbert's Conjecture,
pertaining to Hardy spaces in the upper half-space valued in Clifford modules.
We explore the conjecture proposed by Gilbert in 1991, which seeks to extend
the classical principle of representing real $L^p$ functions on the real line
as boundary ... | 2404.03478v1 |
1998-02-23 | Shell Effects on Rotational Damping in Superdeformed Nuclei | Damping of rotational motion in superdeformed Hg and Dy-region nuclei is
studied by means of cranked shell model diagonalization. It is shown that a
shell oscillation in single-particle alignments affects significantly
properties of rotational damping. Onset properties of damping and damping width
for Hg are quite diff... | 9802065v1 |
2003-08-29 | Influence of radiative damping on the optical-frequency susceptibility | Motivated by recent discussions concerning the manner in which damping
appears in the electric polarizability, we show that (a) there is a dependence
of the nonresonant contribution on the damping and that (b) the damping enters
according to the "opposite sign prescription." We also discuss the related
question of how ... | 0309001v1 |
2024-03-19 | Weakly elliptic damping gives sharp decay | We prove that weakly elliptic damping gives sharp energy decay for the
abstract damped wave semigroup, where the damping is not in the functional
calculus. In this case, there is no overdamping. We show applications in
linearised water waves and Kelvin--Voigt damping. | 2403.13067v1 |
2019-02-25 | Resonant absorption as a damping mechanism for the transverse oscillations of the coronal loops observed by SDO/AIA | Solar coronal loops represent the variety of fast, intermediate, and slow
normal mode oscillations. In this study, the transverse oscillations of the
loops with a few-minutes period and also with damping caused by the resonant
absorption were analyzed using extreme ultraviolet (EUV) images of the Sun. We
employed the 1... | 1902.09649v1 |
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