publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2013-03-19 | Stabilization of the Gear-Grimshaw system on a periodic domain | This paper is devoted to the study of a nonlinear coupled system of two
Korteweg-de Vries equations in a periodic domain under the effect of an
internal damping term. The system was introduced Gear and Grimshaw to model the
interactions of two-dimensional, long, internal gravity waves propagation in a
stratified fluid.... | 1303.4759v2 |
2013-03-26 | Current-driven domain wall motion with spin Hall effect: Reduction of threshold current density | We theoretically study the current-driven domain wall motion in the presence
of both the spin Hall effect and an extrinsic pinning potential. The spin Hall
effect mainly affects the damping ratio of the domain wall precession in the
pinning potential. When the pinning potential is not too strong, this results
in a sign... | 1303.6458v1 |
2013-03-27 | Spontaneous nucleation and dynamics of kink defects in zigzag arrays of trapped ions | The spontaneous nucleation and dynamics of topological kink defects have been
studied in trapped arrays of 41-43 Yb ions. The number of kinks formed as a
function of quench rate across the linear-zigzag transition is measured in the
under-damped regime of the inhomogeneous Kibble-Zurek theory. The experimental
results ... | 1303.6723v1 |
2013-04-11 | Transport of dipolar Bose-Einstein condensates in a one-dimensional optical lattice | We show that magnetic dipolar interactions can stabilize superfluidity in
atomic gases but the dipole alignment direction required to achieve this
varies, depending on whether the flow is oscillatory or continuous. If a
condensate is made to oscillate through a lattice, damping of the oscillations
can be reduced by ali... | 1304.3250v1 |
2013-04-12 | Mechanical signaling via nonlinear wavefront propagation in a mechanically-excitable medium | Models that invoke nonlinear wavefront propagation in a chemically excitable
medium are rife in the biological literature. Indeed, the idea that wavefront
propagation can serve as a signaling mechanism has often been invoked to
explain synchronization of developmental processes. In this paper we suggest a
new kind of s... | 1304.3657v1 |
2013-04-15 | Phase-sticking in one-dimensional Josephson Junction Chains | We studied current-voltage characteristics of long one dimensional Josephson
junction chains with Josephson energy much larger than charging energy, $E_J
\gg E_C$. In this regime, typical IV curves of the samples consist of a
supercurrent branch at low bias voltages followed by a voltage-independent
chain current branc... | 1304.4046v1 |
2013-04-18 | Nonlinear dynamical systems and bistability in linearly forced isotropic turbulence | In this letter, we present an extensive study of the linearly forced
isotropic turbulence. By using analytical method, we identify two parametric
choices, of which they seem to be new as far as our knowledge goes. We prove
that the underlying nonlinear dynamical system for linearly forced isotropic
turbulence is the ge... | 1304.5019v1 |
2013-05-17 | Nonuniversal power-law spectra in turbulent systems | Turbulence is generally associated with universal power-law spectra in scale
ranges without significant drive or damping. Although many examples of
turbulent systems do not exhibit such an inertial range, power-law spectra may
still be observed. As a simple model for such situations, a modified version of
the Kuramoto-... | 1305.4111v2 |
2013-05-25 | Phonon excitation and instabilities in biased graphene nanoconstrictions | We calculate the phonons in a graphene nanoconstriction(GNC) in the presence
of a high current density. The Joule-heating, current-induced forces, and
coupling to electrode phonons is evaluated using first principles
nonequilibrium DFT-NEGF calculations. Close to a resonance in the electronic
structure we observe a str... | 1305.5907v1 |
2013-05-28 | Optical bistability in strong-coupling cavity QED with a few atoms | We present exact numerical solutions of the damped-driven Jaynes--Cummings
model adapted to describe absorptive optical bistability in the limit of a few
atoms strongly coupled to a high-finesse resonator. We show that the
simplifying semiclassical result for many physical quantities of interest is
well reproduced by t... | 1305.6460v1 |
2013-06-16 | Mapping Between Nonlinear Schödinger Equations with Real and Complex Potentials | A mapping between stationary solutions of nonlinear Sch\"odinger equations
with real and complex potentials is constructed and a set of exact solutions
with real energies are obtained for a large class of complex potentials. As
specific examples we consider the case of the damped dynamics of a quantum
harmonic oscillat... | 1306.3643v1 |
2013-06-16 | Non-determinism in the limit of nonsmooth dynamics | Discontinuous time derivatives are used to model threshold-dependent
switching in such diverse applications as dry friction, electronic control, and
biological growth. In a continuous flow, a discon- tinuous derivative can
generate multiple outcomes from a single initial state. Here we show that well
defined solution s... | 1306.3648v1 |
2013-06-17 | Uniformly exponentially stable approximations for a class of damped systems with unbounded feedbacks | In this paper we study time semi-discrete approximations of a class of
exponentially stable infinite dimensional systems with unbounded feedbacks. It
has recently been proved that for time semi-discrete systems, due to high
frequency spurious components, the exponential decay property may be lost as
the time step tends... | 1306.3798v1 |
2013-06-19 | Purifying entanglement of noisy two-qubit states via entanglement swapping | Two qubits in pure entangled states going through separate paths and
interacting with their own individual environments will gradually lose their
entanglement. Here we show that the entanglement change of a two-qubit state
due to amplitude damping noises can be recovered by entanglement swapping. Some
initial states ca... | 1306.4451v4 |
2013-06-19 | A quasi-linear spin-torque nano-oscillator via enhanced negative feedback of power fluctuations | We report an approach to improving the performance of spin torque
nano-oscillators (STNOs) that utilizes power-dependent negative feedback to
achieve a significantly enhanced dynamic damping. In combination with a
sufficiently slow variation of frequency with power this can result in a
quasi-linear STNO, with very weak... | 1306.4668v1 |
2013-06-29 | Tkachenko polarons in vortex lattices | We analyze the properties of impurities immersed in a vortex lattice formed
by ultracold bosons in the mean field quantum Hall regime. In addition to the
effects of a periodic lattice potential, the impurity is dressed by collective
modes with parabolic dispersion (Tkachenko modes). We derive the effective
polaron mode... | 1307.0144v2 |
2013-07-01 | Wigner distribution, nonclassicality and decoherence of generalized and reciprocal binomial states | There are quantum states of light that can be expressed as finite
superpositions of Fock states (FSFS). We demonstrate the nonclassicality of an
arbitrary FSFS by means of its phase space distributions such as the Wigner
function and the $Q$-function. The decoherence of the FSFS is studied by
considering the time evolu... | 1307.0452v1 |
2013-07-25 | Vector boson excitations near deconfined quantum critical points | We show that the N\'eel states of two-dimensional antiferromagnets have low
energy vector boson excitations in the vicinity of deconfined quantum critical
points. We compute the universal damping of these excitations arising from
spin-wave emission. Detection of such a vector boson will demonstrate the
existence of eme... | 1307.6860v1 |
2013-07-29 | Theoretical Study of Spin-Torque Oscillator with Perpendicularly Magnetized Free Layer | The magnetization dynamics of spin torque oscillator (STO) consisting of a
perpendicularly magnetized free layer and an in-plane magnetized pinned layer
was studied by solving the Landau-Lifshitz-Gilbert equation. We derived the
analytical formula of the relation between the current and the oscillation
frequency of the... | 1307.7427v1 |
2013-08-06 | Radiation Reaction Effects in Cascade Scattering of Intense, Tightly Focused Laser Pulses by Relativistic Electrons | Non-linear cascade scattering of intense, tightly focused laser pulses by
relativistic electrons is studied numerically in the classical approximation
including the radiation damping for the quantum parameter hwx-ray/E<1 and an
arbitrary radiation parameter Kai. The electron energy loss, along with its
side scattering ... | 1308.1608v1 |
2013-08-07 | A general method to remove the stiffness of PDEs | A new method to remove the stiffness of partial differential equations is
presented. Two terms are added to the right-hand-side of the PDE : the first is
a damping term and is treated implicitly, the second is of the opposite sign
and is treated explicitly. A criterion for absolute stability is found and the
scheme is ... | 1308.1621v1 |
2013-08-14 | Microscopic description of nuclear vibrations: Relativistic QRPA and its extensions with quasiparticle-vibration coupling | The recent extensions of the covariant energy density functional theory with
the quasiparticle-vibration coupling (QVC) are reviewed. Formulation of the
Quasiparticle Random Phase Approximation (QRPA) in the relativistic framework
is discussed. Self-consistent extensions of the relativistic QRPA imply the QVC
which is ... | 1308.3164v1 |
2013-08-27 | Actively coupled optical waveguides | We consider light propagation through a pair of nonlinear optical waveguides
with absorption, placed in a medium with power gain. The active medium boosts
the in-phase component of the overlapping evanescent fields of the guides,
while the nonlinearity of the guides couples it to the damped out-of-phase
component creat... | 1308.5862v1 |
2013-08-27 | Collective modes in the anisotropic unitary Fermi gas and the inclusion of a backflow term | We study the collective modes of the confined unitary Fermi gas under
anisotropic harmonic confinement as a function of the number of atoms. We use
the equations of extended superfluid hydrodynamics, which take into account a
dispersive von Weizsacker-like term in the equaton of state. We also discuss
the inclusion of ... | 1308.5922v1 |
2013-09-05 | Quantum speed limit of a photon under non-Markovian dynamics | Quantum speed limit (QSL) under noise has drawn considerable attention in
real quantum computational processes and quantum communication. Though
non-Markovian noise is proven to be able to accelerate quantum evolution for a
damped Jaynes-Cummings model, in this work we show that non-Markovianity may
even slow down the ... | 1309.1391v1 |
2013-09-07 | Optomechanical effect on the Dicke quantum phase transition and quasi-particle damping in a Bose-Einstein Condensate: A new tool to measure weak force | We make a semi-classical steady state analysis of the influence of mirror
motion on the quantum phase transition for an optomechanical Dicke model in the
thermodynamic limit. An additional external mechanical pump is shown to modify
the critical value of atom-photon coupling needed to observe the quantum phase
transiti... | 1309.1838v1 |
2013-09-14 | Dynamics of the polarization of a pinned domain wall in a magnetic nanowire | We consider the dynamics of polarization of a single domain wall in a
magnetic nanowire, which is strongly pinned by impurities. In this case the
equation of motion for the polarization parameter does not include any other
dynamical variables and is nonlinear due to magnetic anisotropy. We calculated
numerically the ma... | 1309.3687v1 |
2013-09-28 | High-efficiency GHz frequency doubling without power threshold in thin-film Ni81Fe19 | We demonstrate efficient second-harmonic generation at moderate input power
for thin film Ni81Fe19 undergoing ferromagnetic resonance (FMR). Powers of the
generated second-harmonic are shown to be quadratic in input power, with an
upconversion ratio three orders of magnitude higher than that demonstrated in
ferrite. Th... | 1309.7483v1 |
2013-09-29 | Magnetic shield of PMT used in DAMPE electromagnetic calorimeter | The magnetic characteristics of photomultiplier tube R5610A-01 are studied in
this paper. The experimental data shows that the gain of R5610A-01 loses about
53% when the magnetic field is 3G along its +X axis. A cylinder of one-layer
permalloy strip is able to reduce the effect of 3G magnetic field on the PMT's
gain to... | 1309.7638v4 |
2013-09-30 | Dynamical regimes of dissipative quantum systems | We reveal several distinct regimes of the relaxation dynamics of a small
quantum system coupled to an environment within the plane of the dissipation
strength and the reservoir temperature. This is achieved by discriminating
between coherent dynamics with damped oscillatory behavior on all time scales,
partially cohere... | 1309.7860v2 |
2013-10-01 | Graphene nanoribbon based spaser | A novel type of spaser with the net amplification of surface plasmons (SPs)
in doped graphene nanoribbon is proposed. The plasmons in THz region can be
generated in a dopped graphene nanoribbon due to nonradiative excitation by
emitters like two level quantum dots located along a graphene nanoribbon. The
minimal popula... | 1310.0136v1 |
2013-10-02 | Stochastic Schrödinger Equations for Markovian and non-Markovian cases | Firstly, the Markovian stochastic Schr\"odinger equations are presented,
together with their connections with the theory of measurements in continuous
time. Moreover, the stochastic evolution equations are translated into a
simulation algorithm, which is illustrated by two concrete examples - the
damped harmonic oscill... | 1310.0644v1 |
2013-10-15 | A new tool to study real dynamics: The Convergence Plane | In this paper, the author presents a new tool, called The Convergence Plane,
that allows to study the real dynamics of iterative methods whose iterations
depends on one parameter in an easy and compact way. This tool can be used,
inter alia, to find the elements of a family that have good convergence
properties and dis... | 1310.3986v1 |
2013-10-27 | Quantum simulation of decoherence in optical waveguide lattices | We suggest that propagation of nonclassical light in lattices of optical
waveguides can provide a laboratory tool to simulate quantum decoherence
phenomena with high non-Markovian features. As examples, we study decoherence
of optical Schr\"{o}dinger cats in a lattice that mimics a dissipative quantum
harmonic oscillat... | 1310.7239v1 |
2013-11-05 | Efficient time integration methods based on operator splitting and application to the Westervelt equation | Efficient time integration methods based on operator splitting are introduced
for the Westervelt equation, a nonlinear damped wave equation that arises in
nonlinear acoustics as mathematical model for the propagation of sound waves in
high intensity ultrasound applications. For the first-order Lie-Trotter
splitting met... | 1311.1224v1 |
2013-11-06 | A new optical field state as an output of diffusion channel when the input being number state | We theoretically propose a new optical field state which is named
Laguerre-polynomial-weighted chaotic field. We show that such state can be
implemented, i.e., when a number state enters into a diffusion channel, the
output state is just this kind of states. We solve the master equation
describing the diffusion process... | 1311.1275v1 |
2013-11-14 | Chromo-Natural Model in Anisotropic Background | In this work we study the chromo-natural inflation model in the anisotropic
setup. Initiating inflation from Bianchi type-I cosmology, we analyze the
system thoroughly during the slow-roll inflation, from both analytical and
numerical points of view. We show that the isotropic FRW inflation is an
attractor of the syste... | 1311.3361v2 |
2013-11-27 | Polynomial Stability of Semigroups Generated by Operator Matrices | In this paper we study the stability properties of strongly continuous
semigroups generated by block operator matrices. We consider triangular and
full operator matrices whose diagonal operator blocks generate polynomially
stable semigroups. As our main results, we present conditions under which also
the semigroup gene... | 1311.6960v1 |
2013-12-02 | Critical Field of Spin Torque Oscillator with Perpendicularly Magnetized Free Layer | The oscillation properties of a spin torque oscillator consisting of a
perpendicularly magnetized free layer and an in-plane magnetized pinned layer
are studied based on an analysis of the energy balance between spin torque and
damping. The critical value of an external magnetic field applied normal to the
film plane i... | 1312.0300v1 |
2013-12-09 | Spin-orbit torque opposing the Oersted torque in ultrathin Co/Pt bilayers | Current-induced torques in ultrathin Co/Pt bilayers were investigated using
an electrically driven FMR technique. The angle dependence of the resonances,
detected by a rectification effect as a voltage, were analysed to determine the
symmetries and relative magnitudes of the spin-orbit torques. Both anti-damping
(Slonc... | 1312.2409v1 |
2013-12-10 | Shifted Laplacian based multigrid preconditioners for solving indefinite Helmholtz equations | Shifted Laplacian multigrid preconditioner has become a tool du jour for
solving highly indefinite Helmholtz equations. The idea is to add a complex
damping to the original Helmholtz operator and then apply a multigrid
processing to the resulting operator using it to precondition Krylov methods,
usually Bi-CGSTAB. Not ... | 1312.2880v1 |
2013-12-12 | Fidelity of Fock-state-encoded qubits subjected to continuous variable Gaussian processes | When a harmonic oscillator is under the influence of a Gaussian process such
as linear damping, parametric gain, and linear coupling to a thermal
environment, its coherent states are transformed into states with Gaussian
Wigner function. Qubit states can be encoded in the |0> and |1> Fock states of
a quantum harmonic o... | 1312.3655v1 |
2013-12-16 | Supersonic flutter analysis of flat composite panels by unified formulation | In this paper, the linear flutter characteristics of laminated composite flat
panels immersed in a supersonic flow is investigated using field consistent
elements within the framework of unified formulation. The influence of the
aerodynamic damping on the supersonic flutter characteristics of flat composite
panels is a... | 1312.4233v1 |
2013-12-24 | Fractional Entropy Decaying and the Third Law of Thermodynamics | The quantum thermodynamic property of the fractional damping system is
investigated extensively. A fractional power-law decaying entropy function is
revealed which presents another evidence for the validity of the third law of
thermodynamics in the quantum dissipative region. Several non-trivial
characters are excavate... | 1401.1425v1 |
2014-01-09 | Universal quasinormal modes of large D black holes | We show that in the limit where the number of spacetime dimensions D grows to
infinity a very large class of black holes (including non-extremal, static,
asymptotically flat ones, with any number of gauge-field charges, possibly
coupled to dilatons) possess a universal set of quasinormal modes whose complex
frequencies... | 1401.1957v1 |
2014-01-10 | Quasi PT-symmetry in passive photonic lattices | The concept of quasi-PT symmetry in optical wave guiding system is elaborated
by comparing the evolution dynamics of a PT-symmetric directional coupler and a
passive directional coupler. In particular we show that in the low loss regime,
apart for an overall exponentially damping factor that can be compensated via a
dy... | 1401.2299v3 |
2014-01-15 | Dirac Quasinormal modes of MSW black holes | In this paper we study the Dirac quasinormal modes of an uncharged 2 + 1
black hole proposed by Mandal et. al and referred to as MSW black hole in this
work. The quasi- normal mode is studied using WKB approximation method. The
study shows that the imaginary part of quasinormal frequencies increases
indicating that the... | 1401.3496v1 |
2014-02-04 | Mode competition and anomalous cooling in a multimode phonon laser | We study mode competition in a multimode "phonon laser" comprised of an
optical cavity employing a highly reflective membrane as the output coupler.
Mechanical gain is provided by the intracavity radiation pressure, to which
many mechanical modes are coupled. We calculate the gain, and find that strong
oscillation in o... | 1402.0714v1 |
2014-02-11 | Radiation reaction at the level of the action | The aim of this paper is to highlight a recently proposed method for the
treatment of classical radiative effects, in particular radiation reaction, via
effective field theory methods. We emphasize important features of the method,
and in particular the doubling of fields. We apply the method to two simple
systems: for... | 1402.2610v2 |
2014-02-14 | Thermodynamically self-consistent non-stochastic micromagnetic model for the ferromagnetic state | In this work, a self-consistent thermodynamic approach to micromagnetism is
presented. The magnetic degrees of freedom are modeled using the
Landau-Lifshitz-Baryakhtar theory, that separates the different contributions
to the magnetic damping, and thereby allows them to be coupled to the electron
and phonon systems in ... | 1402.3487v3 |
2014-02-25 | Dynamics of closed ecosystems described by operators | We adopt the so--called \emph{occupation number representation}, originally
used in quantum mechanics and recently adopted in the description of several
classical systems, in the analysis of the dynamics of some models of closed
ecosystems. In particular, we discuss two linear models, for which the solution
can be foun... | 1402.6214v1 |
2014-03-03 | Logarithmic stabilization of the Euler-Bernoulli transmission plate equation with locally distributed Kelvin-Voigt damping | In this paper we will study the asymptotic behaviour of the energy decay of a
transmission plate equation with locally distributed Kelvin-Voigt feedback.
Precisly, we shall prove that the energy decay at least logarithmically over
the time. The originality of this method comes from the fact that using a
Carleman estima... | 1403.0356v1 |
2014-03-12 | Graphene Plasmonics for Terahertz to Mid-Infrared Applications | In recent years, we have seen a rapid progress in the field of graphene
plasmonics, motivated by graphene's unique electrical and optical properties,
tunabilty, long-lived collective excitation and their extreme light
confinement. Here, we review the basic properties of graphene plasmons; their
energy dispersion, local... | 1403.2799v1 |
2014-03-12 | Logarithmic stability in determining two coefficients in a dissipative wave equation. Extensions to clamped Euler-Bernoulli beam and heat equations | We are concerned with the inverse problem of determining both the potential
and the damping coefficient in a dissipative wave equation from boundary
measurements. We establish stability estimates of logarithmic type when the
measurements are given by the operator who maps the initial condition to
Neumann boundary trace... | 1403.3018v2 |
2014-03-13 | Challenges in description of heavy-ion collisions with microscopic time-dependent approaches | Important efforts have been dedicated in the past few years to describe
near-barrier heavy-ion collisions with microscopic quantum theories like the
time-dependent Hartree-Fock approach and some of its extensions. However, this
field is still facing important challenges such as the description of cluster
dynamics, the ... | 1403.3246v1 |
2014-03-14 | Optomechanical atom-cavity interaction in the sub-recoil regime | We study the optomechanical interaction of a Bose-Einstein condensate with a
single longitudinal mode of an ultra-high finesse standing wave optical
resonator. As a unique feature the resonator combines three extreme regimes,
previously not realized together, i.e., strong cooperative coupling, cavity
dominated scatteri... | 1403.3545v1 |
2014-03-21 | Steady Fock states via atomic reservoir | In this letter we present a strategy that combines the action of cavity
damping mechanisms with that of an engineered atomic reservoir to drive an
initial thermal distribution to a Fock equilibrium state. The same technique
can be used to slice probability distributions in the Fock space, thus allowing
the preparation ... | 1403.5482v1 |
2014-03-23 | Smoluchowski-Kramers approximation and large deviations for infinite dimensional gradient systems | In this paper, we explicitly calculate the quasi-potentials for the damped
semilinear stochastic wave equation when the system is of gradient type. We
show that in this case the infimum of the quasi-potential with respect to all
possible velocities does not depend on the density of the mass and does
coincide with the q... | 1403.5743v1 |
2014-03-23 | Smoluchowski-Kramers approximation and large deviations for infinite dimensional non-gradient systems with applications to the exit problem | In this paper, we study the quasi-potential for a general class of damped
semilinear stochastic wave equations. We show that, as the density of the mass
converges to zero, the infimum of the quasi-potential with respect to all
possible velocities converges to the quasi-potential of the corresponding
stochastic heat equ... | 1403.5745v1 |
2014-03-24 | L^p-tauberian theorems and L^p-rates for energy decay | We prove $L^p$-analogues of the classical tauberian theorem of Ingham and
Karamata, and its variations giving rates of decay. These results are applied
to derive $L^p$-decay of operator families arising in the study of the decay of
energy for damped wave equations and local energy for wave equations in
exterior domains... | 1403.6084v2 |
2014-03-30 | Gauge Field Turbulence as a Cause of Inflation in Chern-Simons Modified Gravity | In this paper, we study the dynamics of the Chern-Simons Inflation Model
proposed by Alexander, Marciano and Spergel. According to this model, inflation
begins when a fermion current interacts with a turbulent gauge field in a space
larger than some critical size. This mechanism appears to work by driving
energy from t... | 1403.7702v1 |
2014-04-08 | Exactly solvable model of stochastic heat engine: Optimization of power, its fluctuations and efficiency | We investigate a stochastic heat engine based on an over-damped particle
diffusing on the positive real axis in an externally driven time-periodic
log-harmonic potential. The periodic driving is composed of two isothermal and
two adiabatic branches. Within our specific setting we verify the recent
universal results reg... | 1404.2030v1 |
2014-04-10 | Dual pumped microresonator frequency combs | A study is made of the nonlinear dynamics of dual pumped microresonator Kerr
frequency combs described by a driven and damped nonlinear Schr\"odinger
equation, with an additional degree of freedom in the form of the modulation
frequency. A truncated four wave model is derived for the pump modes and the
dominant sideban... | 1404.2792v1 |
2014-04-11 | Optimal control of a qubit in an optical cavity | We study quantum information processing by means of optimal control theory.
To this end, we analyze the damped Jaynes-Cummings model, and derive optimal
control protocols that minimize the heating or energy dispersion rates, and
controls that drive the system at the quantum speed limit. Special emphasis is
put on analy... | 1404.3137v2 |
2014-04-13 | Invariant sets and connecting orbits for nonlinear evolution equations at resonance | We study the problem of existence of orbits connecting stationary points for
the nonlinear heat and strongly damped wave equations being at resonance at
infinity. The main difficulty lies in the fact that the problems may have no
solutions for general nonlinearity. To address this question we introduce
geometrical assu... | 1404.3428v2 |
2014-04-15 | Finite time cooling in dispersively and dissipatively coupled optomechanics | The cooling performance of an optomechanical system comprising both
dispersive and dissipative coupling is studied. We present a scheme to cool a
mechanical resonator to its ground state in finite time by employing a chirped
pulse. When the cavity damping strength increases, the phonon occupation of the
resonator will ... | 1404.3851v2 |
2014-04-22 | Strong Uniform Attractors for Non-Autonomous Dissipative PDEs with non translation-compact external forces | We give a comprehensive study of strong uniform attractors of non-autonomous
dissipative systems for the case where the external forces are not translation
compact. We introduce several new classes of external forces which are not
translation compact, but nevertheless allow to verify the attraction in a
strong topology... | 1404.5563v1 |
2014-04-26 | Self-interaction model of classical point particle in one-dimension | We consider a hamiltonian system on the real line, consisting of real scalar
field $\phi(x,t)$ and point particle with trajectory $y(t)$. The dynamics of
this system is defined by the system of two equations: wave equation for the
field, <<radiated>> by the point particle, and Newton's equation for the
particle in its ... | 1404.6636v1 |
2014-05-03 | Lie Symmetry Classification and Numerical Analysis of KdV Equation with Power-law Nonlinearity | In this paper, a complete Lie symmetry analysis of the damped wave equation
with time-dependent coefficients is investigated. Then the invariant solutions
and the exact solutions generated from the symmetries are presented. Moreover,
a Lie algebraic classifications and the optimal system are discussed. Finally,
using C... | 1405.0592v3 |
2014-05-08 | Electromagnetic back-reaction from currents on a straight string | Charge carriers moving at the speed of light along a straight,
superconducting cosmic string carry with them a logarithmically divergent slab
of electromagnetic field energy. Thus no finite local input can induce a
current that travels unimpeded to infinity. Rather, electromagnetic
back-reaction must damp this current ... | 1405.2097v2 |
2014-06-03 | Improving Cooling performance of the mechanical resonator with the two-level-system defects | We study cooling performance of a realistic mechanical resonator containing
defects. The normal cooling method through an optomechanical system does not
work efficiently due to those defects. We show by employing periodical
$\sigma_z$ pulses, we can eliminate the interaction between defects and their
surrounded heat ba... | 1406.0555v1 |
2014-06-10 | Influence of Ta insertions on the magnetic properties of MgO/CoFeB/MgO films probed by ferromagnetic resonance | We show by vector network analyzer ferromagnetic resonance measurements that
low Gilbert damping {\alpha} down to 0.006 can be achieved in perpendicularly
magnetized MgO/CoFeB/MgO thin films with ultra-thin insertions of Ta in the
CoFeB layer. While increasing the number of Ta insertions allows thicker CoFeB
layers to ... | 1406.2491v2 |
2014-06-10 | Topological self-dual vacua of deformed gauge theories | We propose a deformation principle of gauge theories in three dimensions that
can describe topologically stable self-dual gauge fields, i.e., vacua
configurations that in spite of their masses do not deform the background
geometry and are locally undetected by charged particles. We interpret these
systems as describing... | 1406.2727v1 |
2014-06-18 | Photonic crystal optics in cold atomic gases | We describe propagation of light in a gas with periodic density modulation,
demonstrating photonic-crystal-like refraction with negative refraction angles.
We address the role of poorly defined boundaries and damping, and derive an
optical analog of the quantum adiabatic theorem. For Cs atoms in an optical
lattice, we ... | 1406.4655v1 |
2014-06-20 | Enhancement of quantum correlations between two particles under decoherence in finite temperature environment | Enhancing the quantum correlations in realistic quantum systems interacting
with the environment of finite temperature is an important subject in quantum
information processing. In this paper, we use weak measurement and measurement
reversal to enhance the quantum correlations in a quantum system consisting of
two part... | 1406.5267v2 |
2014-06-26 | The plucked string: an example of non-normal dynamics | Motion of a single Fourier mode of the plucked string is an example of
transient, free decay of coupled, damped oscillators. It shares the rarely
discussed features of the generic case, e.g., possessing a complete set of
non-orthogonal eigenvectors and no normal modes, but it can be analyzed and
solved analytically by ... | 1406.6939v2 |
2014-07-01 | Newton methods for k-order Markov Constrained Motion Problems | This is a documentation of a framework for robot motion optimization that
aims to draw on classical constrained optimization methods. With one exception
the underlying algorithms are classical ones: Gauss-Newton (with adaptive step
size and damping), Augmented Lagrangian, log-barrier, etc. The exception is a
novel any-... | 1407.0414v1 |
2014-07-02 | On the physics of fizzing: How bubble bursting controls droplets ejection | Bubbles at a free surface surface usually burst in ejecting myriads of
droplets. Focusing on the bubble bursting jet, prelude for these aerosols, we
propose a simple scaling for the jet velocity and we unravel experimentally the
intricate roles of bubble shape, capillary waves, gravity and liquid
properties. We demonst... | 1407.0560v2 |
2014-07-04 | Metal-Dielectric-Graphene Sandwich for Surface Enhanced Raman Spectroscopy | Raman intensity of Rhodamine B (RhB) is enhanced by inserting a thin high
\k{appa} dielectric layer which reduces the surface plasmon damping at the
gold-graphene interface. The results indicate that the Raman intensity
increases sharply by plasmonic resonance enhancement while maintaining
efficient fluorescence quench... | 1407.1129v1 |
2014-07-16 | Internal Decoherence of a Gaussian Wave Packet in a Harmonic Potential | We have studied the quantum dissipative problem of a Gaussian wave packet
under the influence of a harmonic potential. A phenomenological approach to
dissipation is adopted in the light of the well-known model in which the
environment is composed of a bath of non-interacting harmonic oscillators. As
one of the effects ... | 1407.4204v1 |
2014-07-18 | Conditional Ramsey Spectroscopy with Synchronized Atoms | We investigate Ramsey spectroscopy performed on a synchronized ensemble of
two-level atoms. The synchronization is induced by the collective coupling of
the atoms to a heavily damped mode of an optical cavity. We show that, in
principle, with this synchronized system it is possible to observe Ramsey
fringes indefinitel... | 1407.5132v1 |
2014-08-02 | Damped Electromagnetic fluctuations in the early universe? | This short note considers the effects of quantum theory on the linear
evolution of the magnetic fields during and after inflation. The analysis
appears to show that the magnetic fields decay exponentially in the
high-temperature radiation era due to a combination of ohmic dissipation and
vacuum polarisation. | 1408.0367v2 |
2014-08-05 | Scalar and Electromagnetic Quasinormal modes of Extended black hole in F(R) gravity | In this paper we study the scalar and electromagnetic perturbations of an
extended black hole in F(R) gravity. The quasinormal modes in two cases are
evaluated and studied their behavior by plotting graphs in each case. To study
the quasinormal mode, we use the third order WKB method. The present study
shows that the a... | 1408.0935v1 |
2014-08-10 | Generalized Gradient Flow Equation and Its Application to Super Yang-Mills Theory | We generalize the gradient flow equation for field theories with nonlinearly
realized symmetry. Applying the formalism to super Yang-Mills theory, we
construct a supersymmetric extension of the gradient flow equation. It can be
shown that the super gauge symmetry is preserved in the gradient flow.
Furthermore, choosing... | 1408.2185v3 |
2014-08-11 | Formation of Large-Amplitude Low-Frequency Waves in Capillary Turbulence on Superfluid He-II | The results of experimental and theoretical studies of the parametric decay
instability of capillary waves on the surface of superfluid helium He-II are
reported. It is demonstrated that in a system of turbulent capillary waves
low-frequency waves are generated along with the direct Kolmogorov-Zakharov
cascade of capil... | 1408.2560v1 |
2014-08-13 | Dynamic stabilization of an optomechanical oscillator | Quantum optomechanics offers the potential to investigate quantum effects in
macroscopic quantum systems in extremely well controlled experiments. In this
paper we discuss one such situation, the dynamic stabilization of a mechanical
system such as an inverted pendulum. The specific example that we study is a
"membrane... | 1408.3091v2 |
2014-09-15 | Adaptive discontinuous Galerkin methods for non-linear diffusion-convection-reaction equations | In this work, we apply the adaptive discontinuous Galerkin (DGAFEM) method to
the convection dominated non-linear, quasi-stationary
diffusion-convection-reaction equations. We propose an efficient preconditioner
using a matrix reordering scheme to solve the sparse linear systems iteratively
arising from the discretized... | 1409.4313v1 |
2014-09-17 | Delayed-response quantum back-action in nanoelectromechanical systems | We present a semiclassical theory for the delayed response of a quantum dot
(QD) to oscillations of a coupled nanomechanical resonator (NR). We prove that
the back-action of the QD changes both the resonant frequency and the quality
factor of the NR. An increase or decrease in the quality factor of the NR
corresponds t... | 1409.4930v2 |
2014-09-19 | Spreading in Integrable and Non--integrable Many--body Systems | We consider a finite, closed and selfbound many--body system in which a
collective degree of freedom is excited. The redistribution of energy and
momentum into a finite number of the non-collective degrees of freedom is
referred to as spreading as opposed to damping in open systems. Spreading
closely relates to thermal... | 1409.5764v2 |
2014-09-20 | Estimating the output entropy of a tensor product of two quantum channels | In this paper we find, for a class of bipartite quantum states, a nontrivial
lower bound on the entropy gain resulting from the action of a tensor product
of identity channel with an arbitrary channel. By means of that we then
estimate (from below) the output entropy of the tensor product of dephasing
channel with an a... | 1409.5881v2 |
2014-09-24 | Dissipationless Multiferroic Magnonics | We propose that the magnetoelectric effect in multiferroic insulators with
coplanar antiferromagnetic spiral order, such as BiFeO$_{3}$, enables
electrically controlled dissipationless magnonics. Applying an oscillating
electric field in these materials with frequency as low as household frequency
can activate Goldston... | 1409.6900v2 |
2014-09-30 | Mixed finite elements for global tide models | We study mixed finite element methods for the linearized rotating shallow
water equations with linear drag and forcing terms. By means of a strong energy
estimate for an equivalent second-order formulation for the linearized
momentum, we prove long-time stability of the system without energy
accumulation -- the geotryp... | 1410.0045v1 |
2014-10-21 | Coherent beam-beam experiments and implications for head-on compensation | In polarized proton operation in the Relativistic Heavy Ion Collider (RHIC)
coherent beam-beam modes are routinely observed with beam transfer function
measurements. These modes can become unstable under external excitation or in
the presence of impedance. This becomes even more relevant in the presence of
head-on comp... | 1410.5623v1 |
2014-10-22 | Optimization-based smoothing algorithm for triangle meshes over arbitrarily shaped domains | This paper describes a node relocation algorithm based on nonlinear
optimization which delivers excellent results for both unstructured and
structured plane triangle meshes over convex as well as non-convex domains with
high curvature. The local optimization scheme is a damped Newton's method in
which the gradient and ... | 1410.5977v1 |
2014-10-23 | Fully damped Mott oscillations in sub-barrier elastic scattering of identical heavy ions and the nuclear interaction | We investigate the possible disappearance of Mott oscillations in the
scattering of bosonic nuclei at sub-barrier energies. This effect is universal
and happens at a critical value of the Sommerfeld parameter. It is also found
that the inclusion of the short-range nuclear interaction has a profound
influence on this ph... | 1410.6376v1 |
2014-11-03 | Decay rates of magnetic modes below the threshold of a turbulent dynamo | We measure the decay rates of magnetic field modes in a turbulent flow of
liquid sodium below the dynamo threshold.We observe that turbulent fluctuations
induce energy transfers between modes with different symmetries (dipolar and
quadrupolar). Using symmetry properties, we show how to measure the decay rate
of each mo... | 1411.0517v1 |
2014-11-22 | On the symmetry of the Laplacian spectra of signed graphs | We study the symmetry properties of the spectra of normalized Laplacians on
signed graphs. We find a new machinery that generates symmetric spectra for
signed graphs, which includes bipartiteness of unsigned graphs as a special
case. Moreover, we prove a fundamental connection between the symmetry of the
spectrum and t... | 1411.6113v1 |
2014-11-22 | Random Attractor for Stochastic Wave Equation with Arbitrary Exponent and Additive Noise on $\mathbb{R}^n$ | Asymptotic random dynamics of weak solutions for a damped stochastic wave
equation with the nonlinearity of arbitrarily large exponent and the additive
noise on $\mathbb{R}^n$ is investigated. The existence of a pullback random
attractor is proved in a parameter region with a breakthrough in proving the
pullback asympt... | 1411.6139v1 |
2014-11-23 | Dephasing of Kuramoto oscillators in kinetic regime towards a fixed asymptotically free state | We study the kinetic Kuramoto model for coupled oscillators. We prove that
for any regular asymptotically free state, if the interaction is small enough,
it exists a solution which is asymptotically close to it. For this class of
solution the order parameter vanishes to zero, showing a behavior similar to
the phenomeno... | 1411.6304v1 |
2014-11-28 | An Euler-Bernoulli beam with nonlinear damping and a nonlinear spring at the tip | We study the asymptotic behaviour for a system consisting of a clamped
flexible beam that carries a tip payload, which is attached to a nonlinear
damper and a nonlinear spring at its end. Characterizing the omega-limit sets
of the trajectories, we give a necessary condition under which the system is
asymptotically stab... | 1411.7946v2 |
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