publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2022-09-21 | Asymptotic profile of L^2-norm of solutions for wave equations with critical log-damping | We consider wave equations with a special type of log-fractional damping. We
study the Cauchy problem for this model in the whole space, and we obtain an
asymptotic profile and optimal estimates of solutions as time goes to infinity
in L^2-sense. A maximal discovery of this note is that under the effective
damping, in ... | 2209.10154v2 |
2022-09-25 | Origin of Immediate Damping of Coherent Oscillations in Photoinduced Charge Density Wave Transition | In stark contrast to the conventional charge density wave (CDW) materials,
the one-dimensional CDW on the In/Si(111) surface exhibits immediate damping of
the CDW oscillation during the photoinduced phase transition. Here, by
successfully reproducing the experimentally observed photoinduced CDW
transition on the In/Si(... | 2209.12135v1 |
2022-10-11 | QKD in the NISQ era: enhancing secure key rates via quantum error correction | Error mitigation is one of the key challenges in realising the full potential
of quantum cryptographic protocols. Consequently, there is a lot of interest in
adapting techniques from quantum error correction (QEC) to improve the
robustness of quantum cryptographic protocols. In this work, we benchmark the
performance o... | 2210.05297v1 |
2022-10-17 | Engineering imaginary stark ladder in a dissipative lattice: passive $\mathcal{PT}$ symmetry, K symmetry and localized damping | We study an imaginary stark ladder model and propose a realization of the
model in a dissipative chain with linearly increasing site-dependent
dissipation strength. Due to the existence of a $K$-symmetry and passive
$\mathcal{PT}$ symmetry, the model exhibits quite different feature from its
Hermitian counterpart. With... | 2210.08725v3 |
2022-10-18 | A quasi-local inhomogeneous dielectric tensor for arbitrary distribution functions | Treatments of plasma waves usually assume homogeneity, but the parallel
gradients ubiquitous in plasmas can modify wave propagation and absorption. We
derive a quasilocal inhomogeneous correction to the plasma dielectric for
arbitrary distributions by expanding the phase correlation integral and develop
a novel integra... | 2210.10214v1 |
2022-11-04 | On the collisional damping of plasma velocity space instabilities | For plasma velocity space instabilities driven by particle distributions
significantly deviated from a Maxwellian, weak collisions can damp the
instabilities by an amount that is significantly beyond the collisional rate
itself. This is attributed to the dual role of collisions that tend to relax
the plasma distributio... | 2211.02723v3 |
2022-11-12 | Exponential Stability and exact controllability of a system of coupled wave equations by second order terms (via Laplacian) with only one non-smooth local damping | The purpose of this work is to investigate the exponential stability of a
second order coupled wave equations by laplacian with one locally internal
viscous damping. Firstly, using a unique continuation theorem combined with a
Carleman estimate, we prove that our system is strongly stable without any
geometric conditio... | 2211.06706v2 |
2022-11-10 | Generalized Bagley-Torvik Equation and Fractional Oscillators | In this paper the Bagley-Torvik Equation is considered with the order of the
damping term allowed to range between one and two. The solution is found to be
representable as a convolution of trigonometric and exponential functions with
the driving force. The properties of the effective decay rate and the
oscillation fre... | 2211.07575v1 |
2022-11-21 | Lifespan estimates for the compressible Euler equations with damping via Orlicz spaces techniques | In this paper we are interested in the upper bound of the lifespan estimate
for the compressible Euler system with time dependent damping and small initial
perturbations. We employ some techniques from the blow-up study of nonlinear
wave equations. The novelty consists in the introduction of tools from the
Orlicz space... | 2211.11377v1 |
2022-11-24 | A brief introduction to the mathematics of Landau damping | In these short, rather informal, expository notes I review the current state
of the field regarding the mathematics of Landau damping, based on lectures
given at the CIRM Research School on Kinetic Theory, November 14--18, 2022.
These notes are mainly on Vlasov-Poisson in $(x,v) \in \mathbb T^d \times
\mathbb R^d$ howe... | 2211.13707v1 |
2022-12-04 | Vibration suppression of a state-of-the-art wafer gripper | In this paper the implementation of piezoelectrics to a state-of-the-art
wafer gripper is investigated. The objective is to propose and validate a
solution method, which includes a mechanical design and control system, to
achieve at least 5% damping for two eigenmodes of a wafer gripper. This
objective serves as a 'pro... | 2212.01854v1 |
2022-12-20 | Algebra of L-banded Matrices | Convergence is a crucial issue in iterative algorithms. Damping is commonly
employed to ensure the convergence of iterative algorithms. The conventional
ways of damping are scalar-wise, and either heuristic or empirical. Recently,
an analytically optimized vector damping was proposed for memory
message-passing (iterati... | 2212.12431v3 |
2023-01-23 | Non-Markovianity in the time evolution of open quantum systems assessed by means of quantum state distance | We provide a quantitative evaluation of non-Markovianity (NM) for an XX chain
of interacting qubits with one end coupled to a reservoir. The NM of several
non-Markovian spectral densities is assessed in terms of various quantum state
distance (QSD) measures. Our approach is based on the construction of the
density matr... | 2301.09323v2 |
2023-01-26 | Optimisation of Power Grid Stability Under Uncertainty | The increased integration of intermittent and decentralised forms of power
production has eroded the stability margins of power grids and made it more
challenging to ensure reliable and secure power transmission. Reliable grid
operation requires system-scale stability in response to perturbations in
supply or load; pre... | 2301.11215v1 |
2023-02-11 | Uniform stabilization for the semi-linear wave equation with nonlinear Kelvin-Voigt damping | This paper is concerned with the decay estimate of solutions to the
semilinear wave equation subject to two localized dampings in a bounded domain.
The first one is of the nonlinear Kelvin-Voigt type and is distributed around a
neighborhood of the boundary according to the Geometric Control Condition.
While the second ... | 2302.05667v1 |
2023-02-20 | Exponentially stable breather solutions in nonautonomous dissipative nonlinear Schrödinger lattices | We consider damped and forced discrete nonlinear Schr\"odinger equations on
the lattice $\mathbb{Z}$. First we establish the existence of periodic and
quasiperiodic breather solutions for periodic and quasiperiodic driving,
respectively. Notably, quasiperiodic breathers cannot exist in the system
without damping and dr... | 2302.09869v2 |
2023-02-11 | Quasinormal modes, Hawking radiation and absorption of the massless scalar field for Bardeen black hole surrounded by perfect fluid dark matter | Bardeen black hole surrounded by perfect fluid dark matter for a massless
scalar field. Our result shows that the oscillation frequency of quasinormal
modes is enhanced as magnetic charge $g$ or the dark matter parameter $\alpha$
increases. For damping rate of quasinormal modes, the influence of them is
different. Spec... | 2302.10758v1 |
2023-02-24 | A Numerical Approach for Modeling the Shunt Damping of Thin Panels with Arrays of Separately Piezoelectric Patches | Two-dimensional thin plates are widely used in many aerospace and automotive
applications. Among many methods for the attenuation of vibration of these
mechanical structures, piezoelectric shunt damping is a promising way. It
enables a compact vibration damping method without adding significant mass and
volumetric occu... | 2302.12525v1 |
2023-02-27 | Enhancing quantum synchronization through homodyne measurement, noise and squeezing | Quantum synchronization has been a central topic in quantum nonlinear
dynamics. Despite rapid development in this field, very few have studied how to
efficiently boost synchronization. Homodyne measurement emerges as one of the
successful candidates for this task, but preferably in the semi-classical
regime. In our wor... | 2302.13465v2 |
2023-03-06 | Larmor precession in strongly correlated itinerant electron systems | Many-electron systems undergo a collective Larmor precession in the presence
of a magnetic field. In a paramagnetic metal, the resulting spin wave provides
insight into the correlation effects generated by the electron-electron
interaction. Here, we use dynamical mean-field theory to investigate the
collective Larmor p... | 2303.03468v2 |
2023-03-19 | Asymptotic-preserving finite element analysis of Westervelt-type wave equations | Motivated by numerical modeling of ultrasound waves, we investigate robust
conforming finite element discretizations of quasilinear and possibly nonlocal
equations of Westervelt type. These wave equations involve either a strong
dissipation or damping of fractional-derivative type and we unify them into one
class by in... | 2303.10743v1 |
2023-03-31 | Measurement of the cosmic p+He energy spectrum from 46 GeV to 316 TeV with the DAMPE space mission | Recent observations of the light component of the cosmic-ray spectrum have
revealed unexpected features that motivate further and more precise
measurements up to the highest energies. The Dark Matter Particle Explorer
(DAMPE) is a satellite-based cosmic-ray experiment that is operational since
December 2015, continuous... | 2304.00137v4 |
2023-04-18 | Edge-selective extremal damping from topological heritage of dissipative Chern insulators | One of the most important practical hallmarks of topological matter is the
presence of topologically protected, exponentially localised edge states at
interfaces of regions characterised by unequal topological invariants. Here, we
show that even when driven far from their equilibrium ground state, Chern
insulators can ... | 2304.09040v3 |
2023-04-25 | Weakly damped bosons and precursor gap in the vicinity of an antiferromagnetic metallic transition | We study the electronic spectral function of a metal in the vicinity of an
antiferromagnetic (AFM) quantum critical point, focusing on a situation where
the bare bandwidth of the spin fluctuations is significantly smaller than the
Fermi energy. In this limit, we identify a range of energies where the
fermionic quasipar... | 2304.12697v1 |
2023-05-04 | Vibrational resonance in a damped and two-frequency driven system of particle on a rotating parabola | In the present work, we examine the role of nonlinearity in vibrational
resonance (VR) of a forced and damped form of a velocity-dependent potential
system. Many studies have focused on studying the vibrational resonance in
different potentials, like bistable potential, asymmetrically deformed
potential, and rough pote... | 2305.02674v1 |
2023-05-06 | Stochastic wave equation with Hölder noise coefficient: well-posedness and small mass limit | We construct unique martingale solutions to the damped stochastic wave
equation $$ \mu \frac{\partial^2u}{\partial t^2}(t,x)=\Delta
u(t,x)-\frac{\partial u}{\partial
t}(t,x)+b(t,x,u(t,x))+\sigma(t,x,u(t,x))\frac{dW_t}{dt},$$
where $\Delta$ is the Laplacian on $[0,1]$ with Dirichlet boundary condition,
$W$ is space-ti... | 2305.04068v2 |
2023-05-08 | Information capacity analysis of fully correlated multi-level amplitude damping channels | The primary objective of quantum Shannon theory is to evaluate the capacity
of quantum channels. In spite of the existence of rigorous coding theorems that
quantify the transmission of information through quantum channels,
superadditivity effects limit our understanding of the channel capacities. In
this paper, we main... | 2305.04481v2 |
2023-05-09 | Lifespan estimates for semilinear damped wave equation in a two-dimensional exterior domain | Lifespan estimates for semilinear damped wave equations of the form
$\partial_t^2u-\Delta u+\partial_tu=|u|^p$ in a two dimensional exterior domain
endowed with the Dirichlet boundary condition are dealt with. For the critical
case of the semilinear heat equation $\partial_tv-\Delta v=v^2$ with the
Dirichlet boundary c... | 2305.05124v1 |
2023-05-19 | Cold damping of levitated optically coupled nanoparticles | Methods for controlling the motion of single particles, optically levitated
in vacuum, have developed rapidly in recent years. The technique of cold
damping makes use of feedback-controlled, electrostatic forces to increase
dissipation without introducing additional thermal fluctuations. This process
has been instrumen... | 2305.11809v1 |
2023-05-25 | Damping of three-dimensional waves on coating films dragged by moving substrates | Paints and coatings often feature interfacial defects due to disturbances
during the deposition process which, if they persist until solidification,
worsen the product quality. In this article, we investigate the stability of a
thin liquid film dragged by a vertical substrate moving against gravity, a flow
configuratio... | 2305.16139v3 |
2023-06-12 | Realizable Eddy Damped Markovian Anisotropic Closure for Turbulence and Rossby Wave Interactions | A realizable Eddy Damped Markovian Anisotropic Closure (EDMAC) is presented
for the interaction of two dimensional turbulence and transient waves such as
Rossby waves. The structure of the EDMAC ensures that it is as computationally
efficient as the Eddy Damped Quasi Normal Markovian (EDQNM) closure but unlike
the EDQN... | 2306.06921v1 |
2023-06-18 | Partial data inverse problem for hyperbolic equation with time-dependent damping coefficient and potential | We study an inverse problem of determining a time-dependent damping
coefficient and potential appearing in the wave equation in a compact
Riemannian manifold of dimension three or higher. More specifically, we are
concerned with the case of conformally transversally anisotropic manifolds, or
in other words, compact Rie... | 2306.10442v2 |
2023-06-26 | Blow-up result for a weakly coupled system of wave equations with a scale-invariant damping, mass term and time derivative nonlinearity | We study in this article the blow-up of solutions to a coupled semilinear
wave equations which are characterized by linear damping terms in the
\textit{scale-invariant regime}, time-derivative nonlinearities, mass terms and
Tricomi terms. The latter are specifically of great interest from both physical
and mathematical... | 2306.14768v1 |
2023-06-26 | Revisiting the damped quantum harmonic oscillator | We reanalyse the quantum damped harmonic oscillator, introducing three less
than common features. These are (i) the use of a continuum model of the
reservoir rather than an ensemble of discrete oscillators, (ii) an exact
diagonalisation of the Hamiltonian by adapting a technique pioneered by Fano,
and (iii) the use of ... | 2306.15013v1 |
2023-06-27 | SPDER: Semiperiodic Damping-Enabled Object Representation | We present a neural network architecture designed to naturally learn a
positional embedding and overcome the spectral bias towards lower frequencies
faced by conventional implicit neural representation networks. Our proposed
architecture, SPDER, is a simple MLP that uses an activation function composed
of a sinusoidal ... | 2306.15242v1 |
2023-07-03 | Fast Convergence of Inertial Multiobjective Gradient-like Systems with Asymptotic Vanishing Damping | We present a new gradient-like dynamical system related to unconstrained
convex smooth multiobjective optimization which involves inertial effects and
asymptotic vanishing damping. To the best of our knowledge, this system is the
first inertial gradient-like system for multiobjective optimization problems
including asy... | 2307.00975v3 |
2023-07-05 | Strong convergence rates for a full discretization of stochastic wave equation with nonlinear damping | The paper establishes the strong convergence rates of a spatio-temporal full
discretization of the stochastic wave equation with nonlinear damping in
dimension one and two. We discretize the SPDE by applying a spectral Galerkin
method in space and a modified implicit exponential Euler scheme in time. The
presence of th... | 2307.01975v1 |
2023-07-12 | Decoherence effects on lepton number violation from heavy neutrino-antineutrino oscillations | We study decoherence effects and phase corrections in heavy
neutrino-antineutrino oscillations (NNOs), based on quantum field theory with
external wave packets. Decoherence damps the oscillation pattern, making it
harder to resolve experimentally. Additionally, it enhances lepton number
violation (LNV) for processes in... | 2307.06208v1 |
2023-07-23 | Visco-elastic damped wave models with time-dependent coefficient | In this paper, we study the following Cauchy problem for linear visco-elastic
damped wave models with a general time-dependent coefficient $g=g(t)$:
\begin{equation} \label{EqAbstract} \tag{$\star$} \begin{cases} u_{tt}- \Delta
u + g(t)(-\Delta)u_t=0, &(t,x) \in (0,\infty) \times \mathbb{R}^n, \\ u(0,x)=
u_0(x),\quad u... | 2307.12340v1 |
2023-07-24 | Phonon damping in a 2D superfluid: insufficiency of Fermi's golden rule at low temperature | It is generally accepted that the phonon gas of a superfluid always enters a
weak coupling regime at sufficiently low temperatures, whatever the strength of
the interactions between the underlying particles (constitutive of the
superfluid). Thus, in this limit, we should always be able to calculate the
damping rate of ... | 2307.12705v1 |
2023-08-01 | Regularity for the Timoshenko system with fractional damping | We study, the Regularity of the Timoshenko system with two fractional
dampings $(-\Delta)^\tau u_t$ and $(-\Delta)^\sigma \psi_t$; both of the
parameters $(\tau, \sigma)$ vary in the interval $[0,1]$. We note that
($\tau=0$ or $\sigma=0$) and ($\tau=1$ or $\sigma=1$) the dampings are called
frictional and viscous, resp... | 2308.00573v2 |
2023-08-16 | Large time asymptotics for partially dissipative hyperbolic systems without Fourier analysis: application to the nonlinearly damped p-system | A new framework to obtain time-decay estimates for partially dissipative
hyperbolic systems set on the real line is developed. Under the classical
Shizuta-Kawashima (SK) stability condition, equivalent to the Kalman rank
condition in control theory, the solutions of these systems decay exponentially
in time for high fr... | 2308.08280v1 |
2023-09-06 | Effective Description of the Quantum Damped Harmonic Oscillator: Revisiting the Bateman Dual System | In this work, we present a quantization scheme for the damped harmonic
oscillator (QDHO) using a framework known as momentous quantum mechanics. Our
method relies on a semiclassical dynamical system derived from an extended
classical Hamiltonian, where the phase-space variables are given by expectation
values of observ... | 2309.02689v1 |
2023-09-09 | Secondary cosmic-ray nuclei in the model of Galactic halo with nonlinear Landau damping | We employ our recent model of the cosmic-ray (CR) halo by Chernyshov et al.
(2022) to compute the Galactic spectra of stable and unstable secondary nuclei.
In this model, confinement of the Galactic CRs is entirely determined by the
self-generated Alfvenic turbulence whose spectrum is controlled by nonlinear
Landau dam... | 2309.04772v1 |
2023-09-20 | On the damping of tidally driven oscillations | Expansions in the oscillation modes of tidally perturbed bodies provide a
useful framework for representing tidally induced flows. However, recent work
has demonstrated that such expansions produce inaccurate predictions for
secular orbital evolution when mode damping rates are computed independently.
We explore the co... | 2309.11502v1 |
2023-09-25 | Linearly implicit exponential integrators for damped Hamiltonian PDEs | Structure-preserving linearly implicit exponential integrators are
constructed for Hamiltonian partial differential equations with linear constant
damping. Linearly implicit integrators are derived by polarizing the polynomial
terms of the Hamiltonian function and portioning out the nonlinearly of
consecutive time step... | 2309.14184v2 |
2023-10-12 | Plasmon dispersion and Landau damping in the nonlinear quantum regime | We study the dispersion properties of electron plasma waves, or plasmons,
which can be excited in quantum plasmas in the nonlinear regime. In order to
describe nonlinear electron response to finite amplitude plasmons, we apply the
Volkov approach to non-relativistic electrons. For that purpose, we use the
Schr\"odinger... | 2310.08544v1 |
2023-10-29 | Asymptotic profiles for the Cauchy problem of damped beam equation with two variable coefficients and derivative nonlinearity | In this article we investigate the asymptotic profile of solutions for the
Cauchy problem of the nonlinear damped beam equation with two variable
coefficients: \[ \partial_t^2 u + b(t) \partial_t u - a(t) \partial_x^2 u +
\partial_x^4 u
= \partial_x \left( N(\partial_x u) \right). \] In the authors' previous
article ... | 2310.18878v1 |
2023-11-09 | Landau Damping in an Electron Gas | Material science methods aim at developing efficient computational schemes
for describing complex many-body effects and how they are revealed in
experimentally measurable properties. Bethe-Salpeter equation in the
self-consistent Hartree-Fock basis is often used for this purpose, and in this
paper we employ the real-fr... | 2311.05611v2 |
2023-11-11 | On asymptotic properties of solutions to $σ$-evolution equations with general double damping | In this paper, we would like to consider the Cauchy problem for semi-linear
$\sigma$-evolution equations with double structural damping for any $\sigma\ge
1$. The main purpose of the present work is to not only study the asymptotic
profiles of solutions to the corresponding linear equations but also describe
large-time... | 2311.06660v1 |
2023-11-14 | Enhanced classical radiation damping of electronic cyclotron motion in the vicinity of the Van Hove singularity in a waveguide | We study the damping process of electron cyclotron motion and the resulting
emission in a waveguide using the classical Friedrichs model without relying on
perturbation analysis such as Fermi's golden rule. A classical Van Hove
singularity appears at the lower bound (or cut-off frequency) of the dispersion
associated w... | 2311.08121v3 |
2023-11-18 | The temperature dependent Boltzmann equation beyond local equilibrium assumption | In this manuscript, we present a temperature dependent Boltzmann equation for
the particles transport through a environmental reservoir, where the
temperature refers to the equilibrium temperature of reservoir, a new damping
force and a inverse damping relaxation time are derived based on the classical
Boltzmann equati... | 2311.11028v1 |
2023-12-13 | Integrating Superregenerative Principles in a Compact, Power-Efficient NMR/NQR Spectrometer: A Novel Approach with Pulsed Excitation | We present a new approach to Nuclear Quadrupole Resonance (NQR)/Nuclear
Magnetic Resonance (NMR) spectroscopy, the Damp-Enhanced Superregenerative
Nuclear Spin Analyser (DESSA). This system integrates Superregenerative
principles with pulsed sample excitation and detection, offering significant
advancements over tradit... | 2312.08491v1 |
2023-12-26 | Dynamical polarization function, plasmons, their damping and collective effects in semi-Dirac bands | We have calculated the dynamical polarization, plasmons and damping rates in
semi-Dirac bands (SDB's) with zero band gap and half-linear, half-parabolic
low-energy spectrum. The obtained plasmon dispersions are strongly anisotropic
and demonstrate some crucial features of both two-dimensional electron gas and
graphene.... | 2312.16117v1 |
2024-01-09 | Coherent errors in stabilizer codes caused by quasistatic phase damping | Quantum error correction is a key challenge for the development of practical
quantum computers, a direction in which significant experimental progress has
been made in recent years. In solid-state qubits, one of the leading
information loss mechanisms is dephasing, usually modelled by phase flip
errors. Here, we introd... | 2401.04530v2 |
2024-01-19 | Composite learning backstepping control with guaranteed exponential stability and robustness | Adaptive backstepping control provides a feasible solution to achieve
asymptotic tracking for mismatched uncertain nonlinear systems. However,
input-to-state stability depends on high-gain feedback generated by nonlinear
damping terms, and closed-loop exponential stability with parameter convergence
involves a stringen... | 2401.10785v1 |
2024-01-23 | Model-Free $δ$-Policy Iteration Based on Damped Newton Method for Nonlinear Continuous-Time H$\infty$ Tracking Control | This paper presents a {\delta}-PI algorithm which is based on damped Newton
method for the H{\infty} tracking control problem of unknown continuous-time
nonlinear system. A discounted performance function and an augmented system are
used to get the tracking Hamilton-Jacobi-Isaac (HJI) equation. Tracking HJI
equation is... | 2401.12882v1 |
2024-01-30 | The nonlinear dynamic behavior of a Rubber-Layer Roller Bearing (RLRB) for vibration isolation | In this paper, we study the dynamic behavior of a Rubber-Layer Roller Bearing
(RLRB) interposed between a spring-mass elemental superstructure and a
vibrating base. Thanks to the viscoelastic rolling contact between the rigid
rollers and the rubber layers, the RLRB is able to provide a nonlinear damping
behavior. The e... | 2401.16880v1 |
2024-01-30 | Poynting-Robertson damping of laser beam driven lightsails | Lightsails using Earth-based lasers for propulsion require passive
stabilization to stay within the beam. This can be achieved through the sail's
scattering properties, creating optical restoring forces and torques. Undamped
restoring forces produce uncontrolled oscillations, which could jeopardize the
mission, but it ... | 2401.16924v1 |
2024-02-29 | The Equation of Motion for Taut-Line Buzzers | Equations of motion are developed for the oscillatory rotation of a disk
suspended between twisted strings kept under tension by a hanging mass, to
which additional forces may be applied. In the absence of forcing, damped
harmonic oscillations are observed to decay with an exponential time envelope
for two different st... | 2402.19285v1 |
2024-03-08 | A design methodology for nonlinear oscillator chains enabling energy localization tuning and soliton stability enhancement with optimal damping | In this paper, the vibration energy localization in coupled nonlinear
oscillators is investigated, based on the creation of standing solitons. The
main objective is to establish a design methodology for mechanical lattices
using the Nonlinear Schr\"odinger Equation (NLSE) as a guide strategy, even in
the presence of da... | 2403.05176v1 |
2024-03-08 | Damping Obliquities of Hot Jupiter Hosts by Resonance Locking | When orbiting hotter stars, hot Jupiters are often highly inclined relative
to their host star equator planes. By contrast, hot Jupiters orbiting cooler
stars are more aligned. Prior attempts to explain this correlation between
stellar obliquity and effective temperature have proven problematic. We show
how resonance l... | 2403.05616v1 |
2024-03-10 | Linear-in-temperature resistivity and Planckian dissipation arise in a stochastic quantization model of Cooper pairs | We suppose that a Cooper pair (CP) will experience a damping force exerted by
the condensed matter. A Langevin equation of a CP in two dimensional condensed
matter is established. Following a method similar to Nelson's stochastic
mechanics, generalized Schr\"{o}dinger equation of a CP in condensed matter is
derived. If... | 2403.09710v1 |
1995-10-04 | Microlensing By a Prolate All-Macho Halo | It is widely believed that dark matter halos are flattened, that is closer to
oblate than prolate. The evidence cited is based largely on observations of
galaxies which do not look anything like our own and on numerical simulations
which use ad hoc initial conditions. Given what we believe to be a ``reasonable
doubt'' ... | 9510023v1 |
1997-04-25 | Constraints on the density perturbation spectrum from primordial black holes | We re-examine the constraints on the density perturbation spectrum, including
its spectral index $n$, from the production of primordial black holes. The
standard cosmology, where the Universe is radiation dominated from the end of
inflation up until the recent past, was studied by Carr, Gilbert and Lidsey; we
correct t... | 9704251v1 |
1998-02-26 | Inversion of polarimetric data from eclipsing binaries | We describe a method for determining the limb polarization and limb darkening
of stars in eclipsing binary systems, by inverting photometric and polarimetric
light curves.
Because of the ill-conditioning of the problem, we use the Backus-Gilbert
method to control the resolution and stability of the recovered solution... | 9802334v1 |
1998-09-04 | Cluster-Cluster Strong Lensing: Expectations and Detection Methods | We calculate the all-sky number of galaxy clusters that are expected to be
gravitationally lensed by foreground massive clusters. We describe the redshift
and number distributions of clusters using a Press-Schechter analysis, and
model the foreground lensing clusters as singular isothermal spheres. If
Omega_m=0.3 and O... | 9809062v3 |
2000-04-14 | Source Reconstruction as an Inverse Problem | Inverse Problem techniques offer powerful tools which deal naturally with
marginal data and asymmetric or strongly smoothing kernels, in cases where
parameter-fitting methods may be used only with some caution. Although they are
typically subject to some bias, they can invert data without requiring one to
assume a part... | 0004200v1 |
2000-04-18 | Galaxy Cluster Baryon Fractions, Cluster Surveys and Cosmology | The properties of nearby galaxy clusters limit the range of cosmological
parameters consistent with our universe. We describe the limits which arise
from studies of the intracluster medium (ICM) mass fraction fICM and
consideration of the possible sources of systematic error:
Omega_M<0.44h_{50}^{-1/2} at 95% confidence... | 0004244v1 |
2000-05-11 | Measurement of [OIII] Emission in Lyman Break Galaxies | Measurements of [OIII] emission in Lyman Break galaxies (LBGs) at z>3 are
presented. Four galaxies were observed with narrow-band filters using the
Near-IR Camera on the Keck I 10-m telescope. A fifth galaxy was observed
spectroscopically during the commissioning of NIRSPEC, the new infrared
spectrometer on Keck II. Th... | 0005254v1 |
2001-03-02 | Clusters in the Precision Cosmology Era | Over the coming decade, the observational samples available for studies of
cluster abundance evolution will increase from tens to hundreds, or possibly to
thousands, of clusters. Here we assess the power of future surveys to determine
cosmological parameters. We quantify the statistical differences among
cosmologies, i... | 0103049v1 |
2002-07-05 | New Tests of the Cluster Entropy Floor Hypothesis | Recent efforts to account for the observed X-ray luminosity - temperature
relation of galaxy clusters has led to suggestions that the ICM has an apparent
``entropy floor'' at or above the level of 300 keV cm^2. Here, we propose new
tests based on the thermal Sunyaev-Zeldovich effect and on the cluster gas mass
- temper... | 0207147v1 |
2003-06-18 | Kinematic Masses of Super Star Clusters in M82 from High-Resolution Near-Infrared Spectroscopy | Using high-resolution (R~22,000) near-infrared (1.51 -- 1.75 microns) spectra
from Keck Observatory, we measure the kinematic masses of two super star
clusters in M82. Cross-correlation of the spectra with template spectra of cool
evolved stars gives stellar velocity dispersions of sigma_r=15.9 +/- 0.8 km/s
for MGG-9 a... | 0306373v1 |
2003-09-10 | The CMB Quadrupole in a Polarized Light | The low quadrupole of the cosmic microwave background (CMB), measured by COBE
and confirmed by WMAP, has generated much discussion recently. We point out
that the well-known correlation between temperature and polarization
anisotropies of the CMB further constrains the low multipole anisotropy data.
This correlation or... | 0309281v2 |
2003-10-11 | Statistics of Giant Arcs in Galaxy Clusters | We study the expected properties and statistics of giant arcs produced by
galaxy clusters in a LambdaCDM universe and investigate how the characteristics
of CDM clusters determine the properties of the arcs they generate. Due to the
triaxiality and substructure of CDM halos, the giant arc cross section for
individual c... | 0310306v1 |
2004-01-23 | Gravitational Lensing of the Microwave Background by Galaxy Clusters | Galaxy clusters will distort the pattern of temperature anisotropies in the
microwave background via gravitational lensing. We create lensed microwave
background maps using clusters drawn from numerical cosmological simulations. A
distinctive dipole-like temperature fluctuation pattern is formed aligned with
the underl... | 0401519v2 |
2004-04-15 | Is the slope of the intrinsic Baldwin effect constant? | We investigate the relationship between emission-line strength and continuum
luminosity in the best-studied nearby Seyfert 1 galaxy NGC5548. Our analysis of
13 years of ground-based optical monitoring data reveals significant
year-to-year variations in the observed H-beta emission-line response in this
source. More spe... | 0404296v1 |
2005-08-04 | Gravitino, Axino, Kaluza-Klein Graviton Warm and Mixed Dark Matter and Reionisation | Stable particle dark matter may well originate during the decay of long-lived
relic particles, as recently extensively examined in the cases of the axino,
gravitino, and higher-dimensional Kaluza-Klein (KK) graviton. It is shown that
in much of the viable parameter space such dark matter emerges naturally
warm/hot or m... | 0508141v2 |
1999-08-10 | Magnetic relaxation in a classical spin chain as model for nanowires | With decreasing particle size, different mechanisms dominate the thermally
activated magnetization reversal in ferromagnetic particles. We investigate
some of these mechanisms for the case of elongated, single-domain nanoparticles
which we describe by a classical Heisenberg spin chain driven by an external
magnetic fie... | 9908150v1 |
2000-07-17 | Fine-grid Simulations of Thermally Activated Switching in Nanoscale Magets | Numerical integration of the Landau-Lifshitz-Gilbert equation with thermal
fluctuations is used to study the dynamic response of single-domain nanomagnets
to rapid changes in the applied magnetic field. The simulation can resolve
magnetization patterns within nanomagnets and uses the Fast Multipole method to
calculate ... | 0007279v1 |
2001-01-31 | Langevin Simulation of Thermally Activated Magnetization Reversal in Nanoscale Pillars | Numerical solutions of the Landau-Lifshitz-Gilbert micromagnetic model
incorporating thermal fluctuations and dipole-dipole interactions (calculated
by the Fast Multipole Method) are presented for systems composed of nanoscale
iron pillars of dimension 9 nm x 9 nm x 150 nm. Hysteresis loops generated
under sinusoidally... | 0101477v2 |
2001-05-04 | On a common circle: natural scenes and Gestalt rules | To understand how the human visual system analyzes images, it is essential to
know the structure of the visual environment. In particular, natural images
display consistent statistical properties that distinguish them from random
luminance distributions. We have studied the geometric regularities of oriented
elements (... | 0105097v1 |
2002-10-11 | Fluctuations and Dissipation of Coherent Magnetization | A quantum mechanical model is used to derive a generalized Landau-Lifshitz
equation for a magnetic moment, including fluctuations and dissipation. The
model reproduces the Gilbert-Brown form of the equation in the classical limit.
The magnetic moment is linearly coupled to a reservoir of bosonic degrees of
freedom. Use... | 0210273v2 |
2002-11-18 | Field dependence of magnetization reversal by spin transfer | We analyse the effect of the applied field (Happl) on the current-driven
magnetization reversal in pillar-shaped Co/Cu/Co trilayers, where we observe
two different types of transition between the parallel (P) and antiparallel
(AP) magnetic configurations of the Co layers. If Happl is weaker than a rather
small threshol... | 0211371v1 |
2003-10-18 | NMR Investigation of the Organic Conductor lambda-(BETS)2FeCl4 | The two-dimensional organic conductor lambda-(BETS)2FeCl4 has an unusual
phase diagram as a function of temperature and magnetic field that includes a
paramagnetic metal (PM) phase, an antiferromagnetic insulating (AFI) phase, and
a field-induced superconducting phase [S. Uji, H. Kobayashi, L. Balicas, and
James S. Bro... | 0310433v1 |
2004-04-22 | Non-collinear magnetic structures: a possible cause for current induced switching | Current induced switching in Co/Cu/Co trilayers is described in terms of
ab-initio determined magnetic twisting energies and corresponding sheet
resistances. In viewing the twisting energy as an energy flux the
characteristic time thereof is evaluated by means of the
Landau-Lifshitz-Gilbert equation using ab-initio par... | 0404534v1 |
2004-06-21 | Basic considerations for magnetization dynamics in the combined presence of spin-transfer torques and thermal fluctuations | This article reviews basic theoretical features of Gilbert magnetization
dynamics of a single domain magnetic film in the presence of Slonczewski
spin-transfer torques, with and without thermal fluctuations taken into
account. Rather than showing results of detailed numerical calculations, the
discussion here is restri... | 0406486v1 |
2004-06-24 | Thermal Effects on the Magnetic Field Dependence of Spin Transfer Induced Magnetization Reversal | We have developed a self-aligned, high-yield process to fabricate CPP
(current perpendicular to the plane) magnetic sensors of sub 100 nm dimensions.
A pinned synthetic antiferromagnet (SAF) is used as the reference layer which
minimizes dipole coupling to the free layer and field induced rotation of the
reference laye... | 0406574v1 |
2004-07-23 | Micromagnetic understanding of current-driven domain wall motion in patterned nanowires | In order to explain recent experiments reporting a motion of magnetic domain
walls (DW) in nanowires carrying a current, we propose a modification of the
spin transfer torque term in the Landau-Lifchitz-Gilbert equation. We show that
it explains, with reasonable parameters, the measured DW velocities as well as
the var... | 0407628v2 |
2004-08-07 | Hysteresis multicycles in nanomagnet arrays | We predict two new physical effects in arrays of single-domain nanomagnets by
performing simulations using a realistic model Hamiltonian and physical
parameters. First, we find hysteretic multicycles for such nanomagnets. The
simulation uses continuous spin dynamics through the Landau-Lifshitz-Gilbert
(LLG) equation. I... | 0408158v1 |
2004-12-03 | High frequency magnetic permeability of nanocomposite film | The high frequency magnetic permeability of nanocomposite film consisting of
the single-domain spherical ferromagnetic particles in the dielectric matrix is
studied. The permeability is assumed to be determined by rotation of the
ferromagnetic inclusion magnetic moments around equilibrium direction in AC
magnetic field... | 0412073v1 |
2005-01-07 | Dielectric resonances of ordered passive arrays | The electrical and optical properties of ordered passive arrays, constituted
of inductive and capacitive components, are usually deduced from Kirchhoff's
rules. Under the assumption of periodic boundary conditions, comparable results
may be obtained via an approach employing transfer matrices. In particular,
resonances... | 0501137v1 |
2005-07-27 | "Stochastic Modeling of Coercivity " - A Measure of Non-equilibrium State | A typical coercivity versus particle size curve for magnetic nanoparticles
has been explained by using the Gilbert equation followed by the corresponding
Fokker Plank equation. Kramer's treatment has been employed to explain the
increase in coercivity in the single domain region. The single to multi-domain
transformati... | 0507640v1 |
2005-09-13 | Synchronization of spin-transfer oscillators driven by stimulated microwave currents | We have simulated the non-linear dynamics of networks of spin-transfer
oscillators. The oscillators are magnetically uncoupled but electrically
connected in series. We use a modified Landau-Lifschitz- Gilbert equation to
describe the motion of each oscillator in the presence of the oscillations of
all the others. We sh... | 0509326v2 |
2005-11-04 | Synchronized Magnetization Oscillations in F/N/F Nanopillars | Current-induced magnetization dynamics in a trilayer structure composed of
two ferromagnetic free layers and a nonmagnetic spacer is examined. Both free
layers are treated as a monodomain magnetic body with an uniform agnetization.
The dynamics of the two magnetizations is modeled by modified
Landau-Lifshitz-Gilbert eq... | 0511095v1 |
2006-01-27 | Dynamics of thin-film spin-flip transistors with perpendicular source-drain magnetizations | A "spin-flip transistor" is a lateral spin valve consisting of ferromagnetic
source drain contacts to a thin-film normal-metal island with an electrically
floating ferromagnetic base contact on top. We analyze the
\emph{dc}-current-driven magnetization dynamics of spin-flip transistors in
which the source-drain contact... | 0601630v1 |
2007-03-17 | Large-amplitude coherent spin waves exited by spin-polarized current in nanoscale spin valves | We present spectral measurements of spin-wave excitations driven by direct
spinpolarized current in the free layer of nanoscale
Ir20Mn80/Ni80Fe20/Cu/Ni80Fe20 spin valves. The measurements reveal that
large-amplitude coherent spin wave modes are excited over a wide range of bias
current. The frequency of these excitatio... | 0703458v2 |
2001-12-11 | A Data Mining Framework for Optimal Product Selection in Retail Supermarket Data: The Generalized PROFSET Model | In recent years, data mining researchers have developed efficient association
rule algorithms for retail market basket analysis. Still, retailers often
complain about how to adopt association rules to optimize concrete retail
marketing-mix decisions. It is in this context that, in a previous paper, the
authors have int... | 0112013v1 |
2005-02-22 | The QuarkNet/Grid Collaborative Learning e-Lab | We describe a case study that uses grid computing techniques to support the
collaborative learning of high school students investigating cosmic rays.
Students gather and upload science data to our e-Lab portal. They explore those
data using techniques from the GriPhyN collaboration. These techniques include
virtual dat... | 0502089v1 |
2006-10-11 | Properties of codes in rank metric | We study properties of rank metric and codes in rank metric over finite
fields. We show that in rank metric perfect codes do not exist. We derive an
existence bound that is the equivalent of the Gilbert--Varshamov bound in
Hamming metric. We study the asymptotic behavior of the minimum rank distance
of codes satisfying... | 0610057v1 |
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