publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2017-11-30 | TeV dark matter and the DAMPE electron excess | The recent high energy electron and positron flux observed by the DAMPE
experiment indicates possible excess events near 1.4 TeV. Such an excess may be
evidence of dark matter annihilations or decays in a dark matter subhalo that
is located close to the solar system. We give here an analysis of this excess
from annihil... | 1711.11579v1 |
2017-12-04 | Quasi-degenerate dark matter for DAMPE excess and $3.5\,\textrm{keV}$ line | We propose a quasi-degenerate dark matter scenario to simultaneously explain
the $1.4\,\textrm{TeV}$ peak in the high-energy cosmic-ray electron-positron
spectrum reported by the DAMPE collaboration very recently and the
$3.5\,\textrm{keV}$ X-ray line observed in galaxies clusters and from the
Galactic centre and confi... | 1712.00922v1 |
2017-12-06 | Collective modes of an imbalanced unitary Fermi gas | We study theoretically the collective mode spectrum of a strongly imbalanced
two-component unitary Fermi gas in a cigar-shaped trap, where the minority
species forms a gas of polarons. We describe the collective breathing mode of
the gas in terms of the Fermi liquid kinetic equation taking collisions into
account using... | 1712.02181v1 |
2017-12-07 | Bias of Damped Lyman-$α$ systems from their cross-correlation with CMB lensing | We cross-correlate the positions of damped Lyman-$\alpha$ systems (DLAs) and
their parent quasar catalog with a convergence map derived from the Planck
cosmic microwave background (CMB) temperature data. We make consistent
measurements of the lensing signal of both samples in both Fourier and
configuration space. By in... | 1712.02738v2 |
2017-12-08 | Viscoelastic optical nonlocality of low-loss epsilon-near-zero nanofilms | Optical nonlocalities are elusive and hardly observable in traditional
plasmonic materials like noble and alkali metals. Here we report experimental
observation of viscoelastic nonlocalities in the infrared optical response of
doped cadmium-oxide, epsilon-near-zero nanofilms. The nonlocality is detectable
thanks to the... | 1712.03169v2 |
2017-12-08 | A Strong Test of the Dark Matter Origin of the 1.4 TeV DAMPE Signal Using IceCube Neutrinos | A tentative excess in the electron spectrum at 1.4 TeV was recently reported
by the DArk Matter Particle Explorer (DAMPE). A non-astrophysical scenario in
which dark matter particles annihilate or decay in a local clump has been
invoked to explain the excess. If $e^\pm$ annihilation channels in the final
states are med... | 1712.03210v2 |
2017-12-11 | Prospects of type-II seesaw at future colliders in light of the DAMPE $e^+ e^-$ excess | The DAMPE $e^+ e^-$ excess at around 1.4 TeV could be explained in the
type-II seesaw model with a scalar dark mater $D$ which is stabilized by a
discrete $Z_2$ symmetry. The simplest scenario is the annihilation $DD \to
H^{++} H^{--}$ followed by the subsequent decay $H^{\pm\pm} \to e^\pm e^\pm$,
with both the DM and ... | 1712.03642v3 |
2017-12-12 | Thermal decoherence in a strongly correlated Bose liquid | We compute the single particle spectral function of a Bose liquid on a
lattice, at integer filling, close to the superfluid-Mott transition. We use a
`static path approximation' that retains all the classical thermal fluctuations
in the problem, and a real space implementation of the random phase
approximation (RPA) fo... | 1712.04433v1 |
2017-12-17 | Oscillation energy based sensitivity analysis and control for multi-mode oscillation systems | This paper describes a novel approach to analyze and control systems with
multi-mode oscillation problems. Traditional single dominant mode analysis
fails to provide effective control actions when several modes have similar low
damping ratios. This work addresses this problem by considering all modes in
the formulation... | 1712.06157v1 |
2017-12-19 | Nonequilibrium quantum solvation with a time-dependent Onsager cavity | We formulate a theory of nonequilibrium quantum solvation in which parameters
of the solvent are explicitly depending on time. We assume in a simplest
approach a spherical molecular Onsager cavity with a time-dependent radius. We
analyze the relaxation properties of a test molecular point dipole in a
dielectric solvent... | 1712.06973v2 |
2017-12-26 | Newton's equation of motion with quadratic drag force and Toda's potential as a solvable one | The family of exactly solvable potentials for Newton's equation of motion in
the one-dimensional system with quadratic drag force has been determined
completely. The determination is based on the implicit inverse-function
solution valid for any potential shape, and hence exhaustive. This solvable
family includes the ex... | 1712.09189v4 |
2017-12-23 | Density Fluctuations in the Solar Wind Driven by Alfvén Wave Parametric Decay | Measurements and simulations of inertial compressive turbulence in the solar
wind are characterized by anti-correlated magnetic fluctuations parallel to the
mean field and density structures. This signature has been interpreted as
observational evidence for non-propagating pressure balanced structures (PBS),
kinetic io... | 1712.09336v2 |
2018-01-15 | A radiative neutrino mass model in light of DAMPE excess with hidden gauged $U(1)$ symmetry | We propose a one-loop induced neutrino mass model with hidden $U(1)$ gauge
symmetry, in which we successfully involve a bosonic dark matter (DM) candidate
propagating inside a loop diagram in neutrino mass generation to explain the
$e^+e^-$ excess recently reported by the DArk Matter Particle Explorer (DAMPE)
experimen... | 1801.04729v2 |
2018-01-22 | A port-Hamiltonian approach to the control of nonholonomic systems | In this paper a method of controlling nonholonomic systems within the
port-Hamiltonian (pH) framework is presented. It is well known that
nonholonomic systems can be represented as pH systems without Lagrange
multipliers by considering a reduced momentum space. Here, we revisit the
modelling of these systems for the pu... | 1801.06954v1 |
2018-01-23 | Temperature gradient driven heat flux closure in fluid simulations of collisionless reconnection | Recent efforts to include kinetic effects in fluid simulations of plasmas
have been very promising. Concerning collisionless magnetic reconnection, it
has been found before that damping of the pressure tensor to isotropy leads to
good agreement with kinetic runs in certain scenarios. An accurate
representation of kinet... | 1801.07628v1 |
2018-01-29 | Oscillatory relaxation of zonal flows in a multi-species stellarator plasma | The low frequency oscillatory relaxation of zonal potential perturbations is
studied numerically in the TJ-II stellarator (where it was experimentally
detected for the first time). It is studied in full global gyrokinetic
simulations of multi-species plasmas. The oscillation frequency obtained is
compared with predicti... | 1801.09495v1 |
2018-01-30 | Input / Output Stability of a Damped String Equation coupled with Ordinary Differential System | The input/output stability of an interconnected system composed of an
ordinary differential equation and a damped string equation is studied. Issued
from the literature on time-delay systems, an exact stability result is firstly
derived using pole locations. Then, based on the Small-Gain theorem and on the
Quadratic Se... | 1801.09916v2 |
2018-02-05 | Intrinsic spin-orbit torque arising from Berry curvature in metallic-magnet/Cu-oxide interface | We report the observation of the intrinsic damping-like spin-orbit torque
(SOT) arising from the Berry curvature in metallic-magnet/CuO$_x$
heterostructures. We show that a robust damping-like SOT, an order of magnitude
larger than a field-like SOT, is generated in the heterostructure despite the
absence of the bulk sp... | 1802.01285v2 |
2018-02-12 | Selective Phonon Damping in Topological Semimetals | Topological semimetals are characterized by their intriguing Fermi surfaces
(FSs) such as Weyl and Dirac points, or nodal FS, and their associated surface
states. Among them, topological crystalline semimetals, in the presence of
strong spin-orbit coupling, possess a nodal FS protected by non-symmorphic
lattice symmetr... | 1802.04300v2 |
2018-02-14 | Motion of interfaces for a damped hyperbolic Allen-Cahn equation | Consider the Allen-Cahn equation $u_t=\varepsilon^2\Delta u-F'(u)$, where $F$
is a double well potential with wells of equal depth, located at $\pm1$. There
are a lot of papers devoted to the study of the limiting behavior of the
solutions as the diffusion coefficient $\varepsilon\to0^+$, and it is well
known that, if ... | 1802.05038v1 |
2018-02-23 | Blow up of solutions for semilinear wave equations with noneffective damping | In this paper, we study the finite-time blow up of solutions to the following
semilinear wave equation with time-dependent damping \[ \partial_t^2u-\Delta
u+\frac{\mu}{1+t}\partial_tu=|u|^p \] in $\mathbb{R}_{+}\times\mathbb{R}^n$.
More precisely, for $0\leq\mu\leq 2,\mu \neq1$ and $n\geq 2$, there is no
global solutio... | 1802.08403v2 |
2018-03-06 | A comparison of semi-Lagrangian discontinuous Galerkin and spline based Vlasov solvers in four dimensions | The purpose of the present paper is to compare two semi-Lagrangian methods in
the context of the four-dimensional Vlasov--Poisson equation. More
specifically, our goal is to compare the performance of the more recently
developed semi-Lagrangian discontinuous Galerkin scheme with the de facto
standard in Eulerian Vlasov... | 1803.02143v1 |
2018-03-06 | Kak's three-stage protocol of secure quantum communication revisited: Hitherto unknown strengths and weaknesses of the protocol | Kak's three-stage protocol for quantum key distribution is revisited with
special focus on its hitherto unknown strengths and weaknesses. It is shown
that this protocol can be used for secure direct quantum communication.
Further, the implementability of this protocol in the realistic situation is
analyzed by consideri... | 1803.02157v1 |
2018-03-09 | Dynamical evolutions in non-Hermitian triple-well system with complex potential | We investigate the dynamical properties for non-Hermitian triple-well system
with a loss in the middle well. When chemical potentials in two end wells are
uniform and nonlinear interactions are neglected, there always exists a dark
state, whose eigenenergy becomes zero, and the projections onto which do not
change over... | 1803.03360v1 |
2018-03-11 | Graph Laplacian Spectrum and Primary Frequency Regulation | We present a framework based on spectral graph theory that captures the
interplay among network topology, system inertia, and generator and load
damping in determining the overall grid behavior and performance. Specifically,
we show that the impact of network topology on a power system can be quantified
through the net... | 1803.03905v3 |
2018-03-15 | Control Inversion: A Clustering-Based Method for Distributed Wide-Area Control of Power Systems | Wide-area control (WAC) has been shown to be an effective tool for damping
low-frequency oscillations in power systems. In the current state of art, WAC
is challenged by two main factors - namely, scalability of design and
complexity of implementation. In this paper we present a control design called
control inversion ... | 1803.05947v1 |
2018-03-18 | Damped Anderson acceleration with restarts and monotonicity control for accelerating EM and EM-like algorithms | The expectation-maximization (EM) algorithm is a well-known iterative method
for computing maximum likelihood estimates from incomplete data. Despite its
numerous advantages, a main drawback of the EM algorithm is its frequently
observed slow convergence which often hinders the application of EM algorithms
in high-dime... | 1803.06673v2 |
2018-03-21 | Connectivity-Preserving Coordination Control of Multi-Agent Systems with Time-Varying Delays | This paper presents a distributed position synchronization strategy that also
preserves the initial communication links for single-integrator multi-agent
systems with time-varying delays. The strategy employs a coordinating
proportional control derived from a specific type of potential energy,
augmented with damping in... | 1803.08152v1 |
2018-03-23 | A Novel Approach to Resonant Absorption of the Fast MHD Eigenmodes of a Coronal Arcade | The arched field lines forming coronal arcades are often observed to undulate
as magnetohydrodynamic (MHD) waves propagate both across and along the magnetic
field. These waves are most likely a combination of resonantly coupled fast
magnetoacoustic waves and Alfv\'en waves. The coupling results in resonant
absorption ... | 1803.08948v1 |
2018-03-25 | Parareal exponential $θ$-scheme for longtime simulation of stochastic Schrödinger equations with weak damping | A parareal algorithm based on an exponential $\theta$-scheme is proposed for
the stochastic Schr\"odinger equation with weak damping and additive noise. It
proceeds as a two-level temporal parallelizable integrator with the exponential
$\theta$-scheme as the propagator on the coarse grid. The proposed algorithm in
the ... | 1803.09188v1 |
2018-04-01 | Aggregated Momentum: Stability Through Passive Damping | Momentum is a simple and widely used trick which allows gradient-based
optimizers to pick up speed along low curvature directions. Its performance
depends crucially on a damping coefficient $\beta$. Large $\beta$ values can
potentially deliver much larger speedups, but are prone to oscillations and
instability; hence o... | 1804.00325v3 |
2018-04-03 | Damped perturbations in the no-boundary state | We evaluate the no-boundary path integral exactly in a Bianchi IX
minisuperspace with two scale factors. In this model the no-boundary proposal
can be implemented by requiring one scale factor to be zero initially together
with a judiciously chosen regularity condition on the momentum conjugate to the
second scale fact... | 1804.01102v2 |
2018-04-04 | Stabilizable Gaussian states | The unavoidable interaction of quantum systems with their environment usually
results in the loss of desired quantum resources. Suitably chosen system
Hamiltonians, however, can, to some extent, counteract such detrimental decay,
giving rise to the set of stabilizable states. Here, we discuss the possibility
to stabili... | 1804.01315v2 |
2018-04-11 | Collisionless sound in a uniform two-dimensional Bose gas | Using linear response theory within the Random Phase Approximation, we
investigate the propagation of sound in a uniform two dimensional (2D) Bose gas
in the collisionless regime. We show that the sudden removal of a static
density perturbation produces a damped oscillatory behavior revealing that
sound can propagate a... | 1804.04032v2 |
2018-04-11 | Sound propagation in a uniform superfluid two-dimensional Bose gas | In superfluid systems several sound modes can be excited, as for example
first and second sound in liquid helium. Here, we excite propagating and
standing waves in a uniform two-dimensional Bose gas and we characterize the
propagation of sound in both the superfluid and normal regime. In the
superfluid phase, the measu... | 1804.04037v1 |
2018-04-14 | Theory of plasmon reflection by a 1D junction | We present a comprehensive study of the reflection of normally incident
plasmon waves from a low-conductivity 1D junction in a 2D conductive sheet.
Rigorous analytical results are derived in the limits of wide and narrow
junctions. Two types of phenomena determine the reflectance, the cavity
resonances within the junct... | 1804.05256v1 |
2018-03-25 | Nonlinear effect of forced harmonic oscillator subject to sliding friction and simulation by a simple nonlinear circuit | We study the nonlinear behaviors of mass-spring systems damped by dry
friction using simulation by a nonlinear LC circuit damped by anti-parallel
diodes. We show that the differential equation for the electric oscillator is
equivalent to the mechanical one's when a piecewise linear model is used to
simplify the diodes ... | 1804.05762v1 |
2018-04-17 | Asymmetric fitting function for condensed-phase Raman spectroscopy | Asymmetric lineshapes are experimentally observed in Raman spectra of
different classes of condensed matter. Determination of the peak parameters,
typically done with symmetric pseudo-Voigt functions, in such situations yields
unreliable results. While wide choice of asymmetric fitting functions is
possible, for the fu... | 1804.06083v2 |
2018-04-23 | Linear inviscid damping and enhanced viscous dissipation of shear flows by using the conjugate operator method | We study the large time behavior of solutions to two-dimensional Euler and
Navier-Stokes equations linearized about shear flows of the mixing layer type
in the unbounded channel $\mathbb{T} \times \mathbb{R}$. Under a simple
spectral stability assumption on a self-adjoint operator, we prove a local form
of the linear i... | 1804.08291v1 |
2018-04-23 | Capillary waves with surface viscosity | Experiments over the last 50 years have suggested a tentative correlation
between the surface (shear) viscosity and the stability of a foam or emulsion.
We examine this link theoretically using small-amplitude capillary waves in the
presence of a surfactant solution of dilute concentrations where the associated
Marango... | 1804.08389v1 |
2018-04-23 | The Multidimensional Damped Wave Equation: Maximal Weak Solutions for Nonlinear Forcing via Semigroups and Approximation | The damped nonlinear wave equation, also known as the nonlinear telegraph
equation, is studied within the framework of semigroups and eigenfunction
approximation. The linear semigroup assumes a central role: it is bounded on
the domain of its generator for all time t > 0. This permits eigenfunction
approximation within... | 1804.08394v3 |
2018-04-24 | Bidirectional Controlled Quantum Teleportation Using Eight-Qubit Quantum Channel in Noisy Environments | In this work, a novel protocol is proposed for bidirectional controlled
quantum teleportation (BCQT) in which a quantum channel is used with the
eight-qubit entangled state. Using the protocol, two users can teleport an
arbitrary entangled state and a pure two-qubit state (QBS) to each other
simultaneously under the pe... | 1804.08876v3 |
2018-04-25 | Type II Seesaw with scalar dark matter in light of AMS-02, DAMPE and Fermi-LAT | The Standard Model (SM) supplemented by Type II Seesaw and a SM gauge-singlet
scalar dark matter (DM) is a very simple framework to incorporate the observed
neutrino oscillations and provide a plausible DM candidate. In this framework,
the scalar DM naturally has a leptophilic nature with a pair annihilating
mainly int... | 1804.09835v1 |
2018-05-17 | Viscous damping of gravity-capillary waves: Dispersion relations and nonlinear corrections | We discuss the impact of viscosity on nonlinear propagation of surface waves
at the interface of air and a fluid of large depth. After a survey of the
available approximations of the dispersion relation, we propose to modify the
hydrodynamic boundary conditions to model both short and long waves. From them,
we derive a... | 1805.06777v2 |
2018-05-25 | Calculating the transport properties of magnetic materials from first-principles including thermal and alloy disorder, non-collinearity and spin-orbit coupling | A density functional theory based two-terminal scattering formalism that
includes spin-orbit coupling and spin non-collinearity is described. An
implementation using tight-binding muffin-tin orbitals combined with extensive
use of sparse matrix techniques allows a wide variety of inhomogeneous
structures to be flexibly... | 1805.10062v1 |
2018-05-28 | The linearized Vlasov and Vlasov-Fokker-Planck equations in a uniform magnetic field | We study the linearized Vlasov equations and the linearized
Vlasov-Fokker-Planck equations in the weakly collisional limit in a uniform
magnetic field. In both cases, we consider periodic confinement and Maxwellian
(or close to Maxwellian) backgrounds. In the collisionless case, for modes
transverse to the magnetic fie... | 1805.10756v1 |
2018-06-08 | Can Star Products be Augmented by Classical Physics? | It has been suggested that star products in phase-space quantization may be
augmented to describe additional, classical effects. That proposal is examined
critically here. Two known star products that introduce classical effects are:
the generalized Husimi product of coarse-grained quantization, and a
non-Hermitian dam... | 1806.03309v2 |
2018-06-20 | Large-Scale Demonstration of Precise Demand Response Provided by Residential Heating Systems | Being able to adjust the demand of electricity can be an effective means for
power system operators to compensate fluctuating renewable generation, to avoid
grid congestion, and to cope with other contingencies. Electric heating and
cooling systems of buildings can provide different demand response services
because the... | 1806.07670v1 |
2018-06-22 | Weakly coupled systems of semi-linear elastic waves with different damping mechanisms in 3D | We consider the following Cauchy problem for weakly coupled systems of
semi-linear damped elastic waves with a power source non-linearity in
three-dimensions: \begin{equation*}
U_{tt}-a^2\Delta U-\big(b^2-a^2\big)\nabla\text{div }
U+(-\Delta)^{\theta}U_t=F(U),\,\, (t,x)\in[0,\infty)\times\mathbb{R}^3,
\end{equation*}... | 1806.08543v2 |
2018-07-02 | Global Existence of Solutions to the Compressible Euler Equations with Time-dependent Damping and Logarithmic State Equation | In mathematical physics, the pressure function is determined by the equation
of state. There are two existing barotropic state equations: the state equation
for polytropic gas with adiabatic index greater than or equal to 1 and the
state equation for generalized Chaplygin gas in cosmology. In this paper, a
logarithmic ... | 1807.00550v2 |
2018-07-02 | On wave equations of the $p$-Laplacian type with supercritical nonlinearities | This article focuses on a quasilinear wave equation of $p$-Laplacian type: \[
u_{tt} - \Delta_p u -\Delta u_t = f(u) \] in a bounded domain $\Omega \subset
\mathbb{R}^3$ with a sufficiently smooth boundary $\Gamma=\partial \Omega$
subject to a generalized Robin boundary condition featuring boundary damping
and a nonlin... | 1807.00650v1 |
2018-06-30 | Efficient $p$-multigrid method based on an exponential time discretization for compressible steady flows | An efficient multigrid framework is developed for the time marching of
steady-state compressible flows with a spatially high-order ($p$-order
polynomial) modal discontinuous Galerkin method. The core algorithm that based
on a global coupling, exponential time integration scheme provides strong
damping effects to accele... | 1807.01151v1 |
2018-07-04 | Structural crossover in a model fluid exhibiting two length scales: repercussions for quasicrystal formation | We investigate the liquid state structure of the two-dimensional (2D) model
introduced by Barkan et al. [Phys. Rev. Lett. 113, 098304 (2014)], which
exhibits quasicrystalline and other unusual solid phases, focussing on the
radial distribution function $g(r)$ and its asymptotic decay $r\to\infty$. For
this particular m... | 1807.01467v1 |
2018-07-04 | Dirac's Method for the Two-Dimensional Damped Harmonic Oscillator in the Extended Phase Space | The system of two-dimensional damped harmonic oscillator is revisited in the
extended phase space. It is an old problem already addressed by many authors
that we present here in some fresh points of view and carry on smoothly a whole
discussion. We show that the system is singular. The classical Hamiltonian is
proporti... | 1807.01539v2 |
2018-07-05 | Decay of approximate solutions for the damped semilinear wave equation on a bounded 1d domain | In this paper we study the long time behavior for a semilinear wave equation
with space-dependent and nonlinear damping term. After rewriting the equation
as a first order system, we define a class of approximate solutions that employ
tipical tools of hyperbolic systems of conservation laws, such as the Riemann
problem... | 1807.01968v3 |
2018-07-07 | Axial Quasi-Normal Modes of Scalarized Neutron Stars with Realistic Equations of State | We compute the axial quasi-normal modes of static neutron stars in scalar
tensor theory. In particular, we employ various realistic equations of state
including nuclear, hyperonic and hybrid matter. We investigate the fundamental
curvature mode and compare the results with those of General Relativity. We
find that the ... | 1807.02598v1 |
2018-07-09 | DLA and sub-DLA metallicity evolution: A case study of absorbers towards Q0338-0005 | The damped and sub-damped Lyman alpha systems (DLAs and sub-DLAs) traced in
absorption against bright background quasars represent the main reserve of
neutral hydrogen at high redshifts. We used the archival Very Large Telescope
(VLT) instrument Ultraviolet and Visual Echelle Spectrograph (UVES)
high-resolution data of... | 1807.04189v1 |
2018-07-15 | Asymptotic profile of solutions for semilinear wave equations with structural damping | This paper is concerned with the initial value problem for semilinear wave
equation with structural damping $u_{tt}+(-\Delta)^{\sigma}u_t -\Delta u
=f(u)$, where $\sigma \in (0,\frac{1}{2})$ and $f(u) \sim |u|^p$ or $u
|u|^{p-1}$ with $p> 1 + {2}/(n - 2 \sigma)$. We first show the global existence
for initial data smal... | 1807.05509v3 |
2018-07-19 | Vibrational damping effects on electronic energy relaxation in molecular aggregates | Representation of molecular vibrational degrees of freedom by independent
harmonic oscillators, when describing electronic spectra or electronic
excitation energy transport, raises unfavourable effects as vibrational energy
relaxation becomes inaccessible. A standard theoretical description is extended
in this paper by... | 1807.07314v1 |
2018-07-24 | Role of stable modes in driven shear-flow turbulence | A linearly unstable, sinusoidal $E \times B$ shear flow is examined in the
gyrokinetic framework in both the linear and nonlinear regimes. In the linear
regime, it is shown that the eigenmode spectrum is nearly identical to
hydrodynamic shear flows, with a conjugate stable mode found at every unstable
wavenumber. In th... | 1807.09280v1 |
2018-08-08 | An application of $L^1$ estimates for oscillating integrals to parabolic like semi-linear structurally damped $σ$-evolution models | We study the following Cauchy problems for semi-linear structurally damped
$\sigma$-evolution models: \begin{equation*} u_{tt}+ (-\Delta)^\sigma u+ \mu
(-\Delta)^\delta u_t = f(u,u_t),\, u(0,x)= u_0(x),\, u_t(0,x)=u_1(x)
\end{equation*} with $\sigma \ge 1$, $\mu>0$ and $\delta \in
(0,\frac{\sigma}{2})$. Here the functi... | 1808.02706v2 |
2018-08-09 | Two-qubit state recovery from amplitude damping based on weak measurement | In the quantum control process, arbitrary pure or mixed initial states need
to be protected from amplitude damping through the noise channel using
measurements and quantum control. However, how to achieve it on a two-qubit
quantum system remains a challenge. In this paper, we propose a feed-forward
control approach to ... | 1808.03094v1 |
2018-08-10 | Dynamical polarization and the optical response of silicene and related materials | We discuss the dynamical polarization, optical response in low-frequency
regime under in-plane polarized driving field of the silicene. The dynamical
polarization, dielectric function, and absorption of radiation in infrared
region are obtained and shown in the ${\bf q}\sim\omega$ space, and they are
distinguishing for... | 1808.03442v1 |
2018-08-19 | Reconstruction algorithms for photoacoustic tomography in heterogenous damping media | In this article, we study several reconstruction methods for the inverse
source problem of photoacoustic tomography (PAT) with spatially variable sound
speed and damping. The backbone of these methods is the adjoint operators,
which we thoroughly analyze in both the $L^2$- and $H^1$-settings. They are
casted in the for... | 1808.06176v1 |
2018-08-27 | Landau damping of Alfvénic modes in stellarators | It is found that the presence of the so-called non-axisymmetric resonances of
wave-particle interaction in stellarators [which are associated with the lack
of axial symmetry of the magnetic configuration, Kolesnichenko et al., Phys.
Plasmas 9 (2002) 517] may have a strong stabilizing influence through Landau
mechanism ... | 1808.08862v1 |
2018-09-04 | Linear Wave Propagation for Resistive Relativistic Magnetohydrodynamics | We present a linear mode analysis of the relativistic MHD equations in the
presence of finite electrical conductivity. Starting from the fully
relativistic covariant formulation, we derive the dispersion relation in the
limit of small linear perturbations. It is found that the system supports ten
wave modes which can b... | 1809.01115v1 |
2018-09-05 | NMR-like effect on Anisotropic Magnetic Moment of Surface Bound States in Topological Superfluid $^3$He-B | We present experimental observation of a new phenomenon, that we interpret as
NMR-like effect on anisotropic magnetic moment of the surface Andreev bound
states in topological superfluid $^3$He-B at zero temperature limit. We show
that an anisotropic magnetic moment formed near the horizontal surface of a
mechanical re... | 1809.01402v3 |
2018-09-11 | Optomechanical damping basis | We present a closed-form analytical solution to the eigenvalue problem of the
Liouville operator generating the dissipative dynamics of the standard
optomechanical system. The corresponding Lindblad master equation describes the
dynamics of a single-mode field inside an optical cavity coupled by radiation
pressure to i... | 1809.03693v2 |
2018-09-13 | Active Damping of a DC Network with a Constant Power Load: An Adaptive Passivity-based Control Approach | This paper proposes a nonlinear, adaptive controller to increase the
stability margin of a direct-current (DC) small-scale electrical network
containing a constant power load, whose value is unknown. Due to their negative
incremental impedance, constant power loads are known to reduce the effective
damping of a network... | 1809.04920v1 |
2018-09-14 | Nonequilibrium polariton dynamics in a Bose-Einstein condensate coupled to an optical cavity | We study quasiparticle scattering effects on the dynamics of a homogeneous
Bose-Einstein condensate of ultracold atoms coupled to a single mode of an
optical cavity. The relevant excitations, which are polariton-like mixed
excitations of photonic and atomic density-wave modes, are identified. All the
first-order correl... | 1809.05427v2 |
2018-09-26 | The influence of oscillations on energy estimates for damped wave models with time-dependent propagation speed and dissipation | The aim of this paper is to derive higher order energy estimates for
solutions to the Cauchy problem for damped wave models with time-dependent
propagation speed and dissipation. The model of interest is \begin{equation*}
u_{tt}-\lambda^2(t)\omega^2(t)\Delta u +\rho(t)\omega(t)u_t=0, \quad
u(0,x)=u_0(x), \,\, u_t(0,x)=... | 1809.10179v2 |
2018-09-27 | Non-equilibrium Quantum Langevin dynamics of orbital diamagnetic moment | We investigate the time dependent orbital diamagnetic moment of a charged
particle in a magnetic field in a viscous medium via the Quantum Langevin
Equation. We study how the interplay between the cyclotron frequency and the
viscous damping rate governs the dynamics of the orbital magnetic moment in the
high temperatur... | 1809.10370v1 |
2018-09-29 | Uniform stabilization for the Klein-Gordon system in a inhomogeneous medium with locally distributed damping | We consider the Klein-Gordon system posed in an inhomogeneous medium with
smooth boundary subject to a local viscoelastic damping distributed around a
neighborhoodof the boundary according to the Geometric Control Condition. We
show that the energy of the system goes uniformly and exponentially to zero for
all initial ... | 1810.00247v1 |
2018-10-09 | Lévy-walk-like Langevin dynamics | Continuous time random walks and Langevin equations are two classes of
stochastic models for describing the dynamics of particles in the natural
world. While some of the processes can be conveniently characterized by both of
them, more often one model has significant advantages (or has to be used)
compared with the oth... | 1810.04332v1 |
2018-10-18 | Analysis of the controllability from the exterior of strong damping nonlocal wave equations | We make a complete analysis of the controllability properties from the
exterior of the (possible) strong damping wave equation with the fractional
Laplace operator subject to the nonhomogeneous Dirichlet type exterior
condition. In the first part, we show that if $0<s<1$, $\Omega\subset\RR^N$
($N\ge 1$) is a bounded Li... | 1810.08060v1 |
2018-10-20 | Memory-based mediated interactions between rigid particulate inclusions in viscoelastic environments | Many practically relevant materials combine properties of viscous fluids and
elastic solids to viscoelastic behavior. Our focus is on the induced dynamic
behavior of damped finite-sized particulate inclusions in such substances. We
explicitly describe history-dependent interactions that emerge between the
embedded part... | 1810.08832v1 |
2018-10-22 | Dynamical instability towards finite-momentum pairing in quenched BCS superconducting phases | In this work we numerically investigate the fate of the
Bardeen-Cooper-Schrieffer (BCS) pairing in the presence of quenched phase under
Peierls substitution using time-dependent real space and momentum space
Bogoliubov-de Gennes equation methods and Anderson pseudospin representation
method. This kind of phase imprint ... | 1810.09125v1 |
2018-10-21 | A note on a weakly coupled system of semi-linear visco-elastic damped $σ$-evolution models with different power nonlinearities and different $σ$ values | In this article, we prove the global (in time) existence of small data
solutions from energy spaces basing on $L^q$ spaces, with $q \in (1,\infty)$,
to the Cauchy problems for a weakly coupled system of semi-linear visco-elastic
damped $\sigma$-evolution models. Here we consider different power
nonlinearities and diffe... | 1810.09664v1 |
2018-10-25 | First-principles calculation of spin-orbit torque in a Co/Pt bilayer | The angular dependence of spin-orbit torque in a disordered Co/Pt bilayer is
calculated using a first-principles non-equilibrium Green's function formalism
with an explicit supercell averaging over Anderson disorder. In addition to the
usual dampinglike and fieldlike terms, the odd torque contains a sizeable
planar Hal... | 1810.11003v2 |
2018-10-29 | Optimal identification of non-Markovian environments for spin chains | Correlations of an environment are crucial for the dynamics of non-Markovian
quantum systems, which may not be known in advance. In this paper, we propose a
gradient algorithm for identifying the correlations in terms of time-varying
damping rate functions in a time-convolution-less master equation for spin
chains. By ... | 1810.11923v1 |
2018-10-29 | Existence and uniqueness of dynamic evolutions for a one-dimensional debonding model with damping | In this paper we analyse a one-dimensional debonding model for a thin film
peeled from a substrate when viscosity is taken into account. It is described
by the weakly damped wave equation whose domain, the debonded region, grows
according to a Griffith's criterion. Firstly we prove that the equation admits
a unique sol... | 1810.12006v3 |
2018-10-29 | A Graceful Exit for the Cosmological Constant Damping Scenario | We present a broad and simple class of scalar-tensor scenarios that
successfully realize dynamical damping of the effective cosmological constant,
therefore providing a viable dynamical solution to the fine-tuning or "old"
cosmological constant problem. In contrast to early versions of this approach,
pioneered in the w... | 1810.12336v2 |
2018-10-31 | AGN Variability Analysis Handbook | This work develops application techniques for stochastic modelling of Active
Galactic Nuclei (AGN) variability as a probe of accretion disk physics.
Stochastic models, specifically Continuous Auto-Regressive Moving Average
(CARMA) models, characterize lightcurves by estimating delay timescales that
describe movements a... | 1811.00154v1 |
2018-11-15 | Unique ergodicity for a class of stochastic hyperbolic equations with additive space-time white noise | In this paper, we consider a certain class of second order nonlinear PDEs
with damping and space-time white noise forcing, posed on the $d$-dimensional
torus. This class includes the wave equation for $d=1$ and the beam equation
for $d\le 3$. We show that the Gibbs measure of the equation without forcing
and damping is... | 1811.06294v4 |
2018-12-04 | Optical excitation of single- and multi-mode magnetization precession in Galfenol nanolayers | We demonstrate a variety of precessional responses of the magnetization to
ultrafast optical excitation in nanolayers of Galfenol (Fe,Ga), which is a
ferromagnetic material with large saturation magnetization and enhanced
magnetostriction. The particular properties of Galfenol, including cubic
magnetic anisotropy and w... | 1812.01237v1 |
2018-12-10 | Assessment of skin-friction-reduction techniques on a turbulent wing section | The scope of the present project is to quantify the effects of uniform
blowing and body-force damping on turbulent boundary layers subjected to a
non-uniform adverse-pressure-gradient distribution. To this end, well-resolved
large-eddy simulations are employed to describe the flow around the NACA4412
airfoil at moderat... | 1812.03762v1 |
2018-12-18 | Gravitational quasinormal modes of black holes in Einstein-aether theory | The local Lorentz violation (LV) in gravity sector should show itself in
derivation of the characteristic quasinormal modes (QNMs) of black hole mergers
from their general relativity case. In this paper, I study QNMs of the
gravitational field perturbations to Einstein-aether black holes and, at first
compare them to t... | 1812.07994v1 |
2018-12-19 | Rain Calms the Sea - The Impact of Entrained Air | We propose a mechanism for the damping of short ocean gravity waves during
rainstorms associated with the injection of air bubbles by rain drops. The
mechanism is proposed as one of the possible explanations that ascribe to rain
a calming effect on ocean surface waves. A model is developed that shows how
wave attenuati... | 1812.08200v2 |
2018-12-25 | Blow-up for a weakly coupled system of semilinear damped wave equations in the scattering case with power nonlinearities | In this work we study the blow-up of solutions of a weakly coupled system of
damped semilinear wave equations in the scattering case with power
nonlinearities. We apply an iteration method to study both the subcritical case
and the critical case. In the subcritical case our approach is based on lower
bounds for the spa... | 1812.10086v1 |
2018-12-27 | Global existence of solutions to semilinear damped wave equation with slowly decaying inital data in exterior domain | In this paper, we discuss the global existence of weak solutions to the
semilinear damped wave equation \begin{equation*} \begin{cases}
\partial_t^2u-\Delta u + \partial_tu = f(u) & \text{in}\ \Omega\times (0,T), \\
u=0 & \text{on}\ \partial\Omega\times (0,T), \\ u(0)=u_0, \partial_tu(0)=u_1 &
\text{in}\ \Omega, \end{c... | 1812.10664v1 |
2018-12-28 | Axion Misalignment Driven to the Bottom | Several theoretical motivations point to ultralight QCD axions with large
decay constants $f_a \simeq \mathcal{O}(10^{16}-10^{17})$ GeV, to which
experimental proposals are dedicated. This regime is known to face the problem
of overproduction of axion dark matter from the misalignment mechanism unless
the misalignment ... | 1812.11186v2 |
2019-01-03 | Calibration and Status of the 3D Imaging Calorimeter of DAMPE for Cosmic Ray Physics on Orbit | The DArk Matter Particle Explorer (DAMPE) developed in China was designed to
search for evidence of dark matter particles by observing primary cosmic rays
and gamma rays in the energy range from 5 GeV to 10 TeV. Since its launch in
December 2015, a large quantity of data has been recorded. With the data set
acquired du... | 1901.00734v1 |
2019-01-08 | Atom-only descriptions of the driven-dissipative Dicke model | We investigate how to describe the dissipative spin dynamics of the
driven-dissipative Dicke model, describing $N$ two-level atoms coupled to a
cavity mode, after adiabatic elimination of the cavity mode. To this end, we
derive a Redfield master equation which goes beyond the standard secular
approximation and large de... | 1901.02473v2 |
2019-01-10 | Stability and Controllability results for a Timoshenko system | In this paper, we study the indirect boundary stability and exact
controllability of a one-dimensional Timoshenko system. In the first part of
the paper, we consider the Timoshenko system with only one boundary fractional
damping. We first show that the system is strongly stable but not uniformly
stable. Hence, we look... | 1901.03303v2 |
2019-01-13 | Dueling Dynamical Backaction in a Cryogenic Optomechanical Cavity | Dynamical backaction has proven to be a versatile tool in cavity
optomechanics, allowing for precise manipulation of a mechanical resonator's
motion using confined optical photons. In this work, we present measurements of
a silicon whispering-gallery-mode optomechanical cavity where backaction
originates from opposing ... | 1901.03950v1 |
2019-01-22 | Coupling between superfluid neutrons and superfluid protons in the elementary excitations of neutron star matter | Several phenomena occurring in neutron stars are affected by the elementary
excitations that characterize the stellar matter. In particular, low-energy
excitations can play a major role in the emission and propagation of neutrinos,
neutron star cooling and transport processes. In this paper, we consider the
elementary ... | 1901.07550v1 |
2019-02-08 | Milky Way Halo Vibrations and Incommensurate Stream Velocities | Collisionless dark matter galactic halos are expected to exhibit damped
oscillations as a result of ongoing late time accretion. An n-body model of the
cosmological assembly of a Milky Way-like halo is used to quantify the time
dependence of its gravitational field. The simulation contains stellar streams
whose incomme... | 1902.03275v2 |
2019-02-20 | Dark matter gets DAMPE at high energies | The DArk Matter Particle Explorer (DAMPE) mission revealed a break in the
spectrum of cosmic-ray electons and positrons. This is associated with an
excess above the expected backgrounds at energies around 1 TeV. Several authors
have argued that such an excess can be explained in terms of dark matter models
that feature... | 1902.07468v1 |
2019-02-23 | General symmetry in the reduced dynamics of two-level system | We study general transformation on the density matrix of two-level system
that keeps the expectation value of observable invariant. We introduce a set of
generators that yields hermiticity and trace preserving general transformation
which casts the transformation into simple form. The general transformation is
in gener... | 1902.08714v2 |
2019-02-25 | Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario | The precise measurements of energy spectra of cosmic ray positrons and/or
electrons by recent experiments show clear excesses above 10 GeV. Moreover, a
potential sharp spectral feature was suggested by the Dark Matter Particle
Explorer (DAMPE) data. These results inspire quite a number of discussions on
the connection ... | 1902.09235v2 |
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