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2011-08-02 | PHENIX Measurements of Higher-order Flow Harmonics in Au+Au collisions at Root_s = 200 GeV | Flow coefficients $v_n$ for $n$ = 2, 3, 4, characterizing the anisotropic
collective flow in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV, are
presented. They indicate the expected growth of viscous damping for sound
propagation in the quark gluon plasma (QGP) produced in these collisions.
Hydrodynamical model compari... | 1108.0457v1 |
2011-08-10 | Critical exponents of steady-state phase transitions in fermionic lattice models | We discuss reservoir induced phase transitions of lattice fermions in the
non-equilibrium steady state (NESS) of an open system with local reservoirs.
These systems may become critical in the sense of a diverging correlation
length upon changing the reservoir coupling. We here show that the transition
to a critical sta... | 1108.2263v5 |
2011-09-09 | Observation of Spontaneous Brillouin Cooling | While radiation-pressure cooling is well known, the Brillouin scattering of
light from sound is considered an acousto-optical amplification-only process.
It was suggested that cooling could be possible in multi-resonance Brillouin
systems when phonons experience lower damping than light. However, this regime
was not ac... | 1109.2084v2 |
2011-09-14 | Oscillations of simple networks | To describe the flow of a miscible quantity on a network, we introduce the
graph wave equation where the standard continuous Laplacian is replaced by the
graph Laplacian. This is a natural description of an array of inductances and
capacities, of fluid flow in a network of ducts and of a system of masses and
springs. T... | 1109.3071v2 |
2011-09-21 | High-order explicit local time-stepping methods for damped wave equations | Locally refined meshes impose severe stability constraints on explicit
time-stepping methods for the numerical simulation of time dependent wave
phenomena. Local time-stepping methods overcome that bottleneck by using
smaller time-steps precisely where the smallest elements in the mesh are
located. Starting from classi... | 1109.4480v2 |
2011-09-21 | Anisotropic critical magnetic fluctuations in the ferromagnetic superconductor UCoGe | We report neutron scattering measurements of critical magnetic excitations in
the weakly ferromagnetic superconductor UCoGe. The strong non-Landau damping of
the excitations we observe, although unusual has been found in another related
ferromagnet, UGe2 at zero pressure. However, we also find there is a
significant an... | 1109.4541v1 |
2011-09-30 | PT-symmetry, indefinite damping and dissipation-induced instabilities | With perfectly balanced gain and loss, dynamical systems with indefinite
damping can obey the exact PT-symmetry being marginally stable with a pure
imaginary spectrum. At an exceptional point where the symmetry is spontaneously
broken, the stability is lost via passing through a non-semisimple 1:1
resonance. In the par... | 1110.0018v2 |
2011-10-01 | Electrical measurement of antivortex wall eigenfrequency | The dynamics of a ferromagnetic antivortex wall has been experimentally
studied in a magnetic nanostructure. Two different techniques have been used to
independently measure the eigenfrequency of an antivortex wall such as the
resonance excitation by sinusoidal microwave and the damped resonance
excitation induced by s... | 1110.0113v1 |
2011-10-06 | Comparative Wakefield Analysis of a First Prototype of a DDS Structure for CLIC Main Linac | A Damped Detuned Structure (DDS) for CLIC main linac has been proposed as an
alternative to the present baseline design which is based on heavy damping. A
first prototype, CLIC_DDS_A, for high power tests has been already designed and
is under construction. It is also foreseen to design a further prototype,
CLIC_DDS_B,... | 1110.1207v1 |
2011-10-12 | Nonlinear dynamic analysis of an optimal particle damper | We study the dynamical behavior of a single degree of freedom mechanical
system with a particle damper. The particle (granular) damping was optimized
for the primary system operating condition by using an appropriate gap size for
a prismatic enclosure. The particles absorb the kinetic energy of the vibrating
structure ... | 1110.2800v1 |
2011-10-14 | Effect of Compton Scattering on the Electron Beam Dynamics at the ATF Damping Ring | Compton scattering provides one of the most promising scheme to obtain
polarized positrons for the next generation of $e^-$ -- $e^+$ colliders.
Moreover it is an attractive method to produce monochromatic high energy
polarized gammas for nuclear applications and X-rays for compact light sources.
In this framework a fou... | 1110.3241v1 |
2011-10-15 | Atomistic spin dynamic method with both damping and moment of inertia effects included from first principles | We consider spin dynamics for implementation in an atomistic framework and we
address the feasibility of capturing processes in the femtosecond regime by
inclusion of moment of inertia. In the spirit of an {\it s-d} -like interaction
between the magnetization and electron spin, we derive a generalized equation
of motio... | 1110.3387v2 |
2011-10-24 | CoB/Ni-Based Multilayer Nanowire with High-Speed Domain Wall Motion under Low Current Control | The spin-transfer torque motion of magnetic domain walls (DWs) in a
CoB/Ni-based nanowire driven by a low current density of
(1.12\pm0.8)\times10^{11} A m^{-2} has been observed indirectly by
magnetotransport measurements. A high DW velocity of 85\pm4 m/s at zero field
was measured at the threshold current density. Upo... | 1110.5112v3 |
2011-10-28 | Stability of linear and non-linear lambda and tripod systems in the presence of amplitude damping | We present the stability analysis of the dark states in the adiabatic passage
for the linear and non-linear lambda and tripod systems in the presence of
amplitude damping (losses). We perform an analytic evaluation of the real parts
of eigenvalues of the corresponding Jacobians, the non-zero eigenvalues of
which are fo... | 1110.6379v2 |
2011-11-07 | Control of Material Damping in High-Q Membrane Microresonators | We study the mechanical quality factors of bilayer aluminum/silicon-nitride
membranes. By coating ultrahigh-Q Si3N4 membranes with a more lossy metal, we
can precisely measure the effect of material loss on Q's of tensioned resonator
modes over a large range of frequencies. We develop a theoretical model that
interpret... | 1111.1703v2 |
2011-11-15 | Thermodynamic anomaly of the free damped quantum particle: the bath perspective | A possible definition of the specific heat of open quantum systems is based
on the reduced partition function of the system. For a free damped quantum
particle, it has been found that under certain conditions, this specific heat
can become negative at low temperatures. In contrast to the conventional
approaches focusin... | 1111.3594v2 |
2011-12-02 | On the propagation of binary signals in damped mechanical systems of oscillators | In the present work, we explore efficient ways to transmit binary information
in discrete, semi-infinite chains of coupled oscillators using the process of
nonlinear supratransmission. A previous work showed that such transmission is
possible and, indeed, reliable under the idealistic condition when weak or no
damping ... | 1112.0585v1 |
2011-12-02 | On the simulation of the energy transmission in the forbidden band-gap of a spatially discrete double sine-Gordon system | In this work, we present a numerical method to consistently approximate
solutions of a spatially discrete, double sine-Gordon chain which considers the
presence of external damping. In addition to the finite-difference scheme
employed to approximate the solution of the difference-differential equations
of the model und... | 1112.0595v1 |
2011-12-11 | Spin-polarized current effect on antiferromagnet magnetization in a ferromagnet - antiferromagnet nanojunction: Theory and simulation | Spin-polarized current effect is studied on the static and dynamic
magnetization of the antiferromagnet in a ferromagnet - antiferromagnet
nanojunction. The macrospin approximation is generalized to antiferromagnets.
Canted antiferromagnetic configuration and resulting magnetic moment are
induced by an external magneti... | 1112.2362v1 |
2011-12-15 | Analytic gas orbits in an arbitrary rotating galactic potential using the linear epicyclic approximation | A code, Epic5, has been developed which computes, in the two-dimensional
case, the initially circular orbits of guiding centra in an arbitrary
axisymmetric potential with an arbitrary, weak perturbing potential in solid
body rotation. This perturbing potential is given by its Fourier expansion. The
analytic solution so... | 1112.3658v1 |
2011-12-23 | Temperature gradient assisted magnetodynamics in a ferromagnetic nanowire | The dynamics of the low energy excitations in a ferromagnet is studied in
case a temperature gradient is coupled to the local magnetization. Due to the
different time scales of changing temperature and magnetization it is argued
that only the coupling between the spatially varying part of the temperature
field and the ... | 1112.5562v1 |
2012-01-04 | A new candidate for probing Population III nucleosynthesis with carbon-enhanced damped Lyman-alpha systems | We report the identification of a very metal-poor damped Lyman-alpha system
(DLA) at z_abs = 3.067295 that is modestly carbon-enhanced, with an iron
abundance of ~1/700 solar ([Fe/H] = -2.84) and [C,O/Fe] ~ +0.6. Such an
abundance pattern is likely to be the result of nucleosynthesis by massive
stars. On the basis of 1... | 1201.1004v2 |
2012-01-06 | Magnetic field decay with Hall drift in neutron star crusts | The dynamics of magnetic field decay with Hall drift is investigated.
Assuming that axisymmetric magnetic fields are located in a spherical crust
with uniform conductivity and electron number density, long-term evolution is
calculated up to Ohmic dissipation. The nonlinear coupling between poloidal and
toroidal compone... | 1201.1346v1 |
2012-01-06 | Reversible Dissipative Processes, Conformal Motions and Landau Damping | The existence of a dissipative flux vector is known to be compatible with
reversible processes, provided a timelike conformal Killing vector (CKV)
$\chi^\alpha=\frac{V^\alpha}{T}$ (where $V^\alpha$ and $T$ denote the
four-velocity and temperature respectively) is admitted by the space-time. Here
we show that if a const... | 1201.1390v1 |
2012-01-19 | Wave Leakage and Resonant Absorption in a Loop Embedded in a Coronal Arcade | We investigate the temporal evolution of impulsively generated perturbations
in a potential coronal arcade with an embedded loop. As the initial
configuration we consider a coronal loop, represented by a density enhancement,
which is unbounded in the ignorable direction of the arcade. The linearized
time-dependent magn... | 1201.4042v1 |
2012-02-08 | Evidence of Wave Damping at Low Heights in a Polar Coronal Hole | We have measured the widths of spectral lines from a polar coronal hole using
the Extreme Ultraviolet Imaging Spectrometer onboard Hinode. Polar coronal
holes are regions of open magnetic field and the source of the fast solar wind.
We find that the line widths decrease at relatively low heights. Previous
observations ... | 1202.1743v2 |
2012-02-14 | The kinetic temperature in a damped Lyman-alpha absorption system in Q2206-199 - an example of the warm neutral medium | By comparing the widths of absorption lines from OI, SiII and FeII in the
redshift z=2.076 single-component damped Lyman alpha absorption system in the
spectrum of Q2206-199 we establish that these absorption lines arise in Warm
Neutral Medium gas at ~12000 +/- 3000K. This is consistent with thermal
equilibrium model e... | 1202.3012v1 |
2012-02-23 | Eigenmodes of the damped wave equation and small hyperbolic subsets | We study stationary solutions of the damped wave equation on a compact and
smooth Riemannian manifold without boundary. In the high frequency limit, we
prove that a sequence of $\beta$-damped stationary solutions cannot be
completely concentrated in small neighborhoods of a small fixed hyperbolic
subset made of $\beta$... | 1202.5123v3 |
2012-03-04 | Dissipation effects in random transverse-field Ising chains | We study the effects of Ohmic, super-Ohmic, and sub-Ohmic dissipation on the
zero-temperature quantum phase transition in the random transverse-field Ising
chain by means of an (asymptotically exact) analytical strong-disorder
renormalization-group approach. We find that Ohmic damping destabilizes the
infinite-randomne... | 1203.0698v2 |
2012-03-22 | Large Amplitude Longitudinal Oscillations in a Solar Filament | We have developed the first self-consistent model for the observed
large-amplitude oscillations along filament axes that explains the restoring
force and damping mechanism. We have investigated the oscillations of multiple
threads formed in long, dipped flux tubes through the thermal nonequilibrium
process, and found t... | 1203.5027v1 |
2012-03-26 | Analysis of the Energy Decay of a Degenerated Thermoelasticity System | In this paper, we study a system of thermoelasticity with a degenerated
second order operator in the Heat equation. We analyze the evolution of the
energy density of a family of solutions. We consider two cases: when the set of
points where the ellipticity of the Heat operator fails is included in a
hypersurface and wh... | 1203.5606v1 |
2012-03-26 | Infinite Energy Solutions for Damped Navier-Stokes Equations in R2 | We study the so-called damped Navier-Stokes equations in the whole 2D space.
The global well-posedness, dissipativity and further regularity of weak
solutions of this problem in the uniformly-local spaces are verified based on
the further development of the weighted energy theory for the Navier-Stokes
type problems. No... | 1203.5733v2 |
2012-03-28 | Quantum-correlating power of local quantum channels | Quantum correlation can be created by local operations from a classically
correlated state. We define quantum-correlating power (QCP) of a local quantum
channel as the maximum amount of quantum correlation that can be created by the
channel. The quantum correlation that we discuss in this article is defined on
the left... | 1203.6149v1 |
2012-04-12 | On the sizes of z>2 Damped Lyman-alpha Absorbing Galaxies | Recently, the number of detected galaxy counterparts of z > 2 Damped
Lyman-alpha Absorbers in QSO spectra has increased substantially so that we
today have a sample of 10 detections. M{\o}ller et al. in 2004 made the
prediction, based on a hint of a luminosity-metallicity relation for DLAs, that
HI size should increase... | 1204.2833v1 |
2012-04-16 | Quasi-normal modes, area spectra and multi-horizon spacetimes | We suggest an interpretation for the highly damped QNM frequencies of the
spherically symmetric multi-horizon spacetimes (Reissner-Nordstrom,
Schwarzschild-deSitter, Reissner-Nordstrom-deSitter) following Maggiore's
proposal about the link between the asymptotic QNM frequencies and the black
hole thermodynamics. We sho... | 1204.3566v2 |
2012-05-03 | Explicit local time-stepping methods for time-dependent wave propagation | Semi-discrete Galerkin formulations of transient wave equations, either with
conforming or discontinuous Galerkin finite element discretizations, typically
lead to large systems of ordinary differential equations. When explicit time
integration is used, the time-step is constrained by the smallest elements in
the mesh ... | 1205.0654v2 |
2012-05-15 | Molecular vibrations-induced quantum beats in two-dimensional electronic spectroscopy | Quantum beats in nonlinear spectroscopy of molecular aggregates are often
attributed to electronic phenomena of excitonic systems, while nuclear degrees
of freedom are commonly included into models as overdamped oscillations of bath
constituents responsible for dephasing. However, molecular systems are coupled
to vario... | 1205.3383v2 |
2012-05-16 | Deuterium at high-redshift: Primordial abundance in the zabs = 2.621 damped Ly-alpha system towards CTQ247 | The detection of neutral deuterium in the low-metallicity damped
Lyman-{\alpha} system at zabs = 2.621 towards the quasar CTQ247 is reported.
Using a high signal-to-noise and high spectral resolution (R = 60000) spectrum
from the Very Large Telescope Ultraviolet and Visual Echelle Spectrograph, we
precisely measure the... | 1205.3777v1 |
2012-05-23 | Global existence for a damped wave equation and convergence towards a solution of the Navier-Stokes problem | In two and three space dimensions, and under suitable assumptions on the
initial data, we show global existence for a damped wave equation which
approaches, in some sense, the Navier-Stokes problem. The proofs are based on a
refined energy method. In this paper, we improve the results in two papers by
Y. Brenier, R. Na... | 1205.5166v2 |
2012-05-24 | Modelling the Propagation of a Weak Fast-Mode MHD Shock Wave near a 2D Magnetic Null Point Using Nonlinear Geometrical Acoustics | We present the results of analytical modelling of fast-mode
magnetohydrodynamic wave propagation near a 2D magnetic null point. We consider
both a linear wave and a weak shock and analyse their behaviour in cold and
warm plasmas. We apply the nonlinear geometrical acoustics method based on the
Wentzel-Kramers-Brillouin... | 1205.5327v1 |
2012-05-31 | Quasinormal modes for the scattering on a naked Reissner-Nordstrom singularity | What should be the quasinormal modes associated with a spacetime that
contains a naked singularity instead of a black hole? In the present work we
address this problem by studying the scattering of scalar fields on a curved
background described by a Reissner-Nordstr\"om spacetime with $|q| > m$. We
show that there is a... | 1206.0037v3 |
2012-06-06 | Perturbation theory for very long-range potentials | Systems with very long-range interactions (that decay at large distances like
$U(r)\sim r^{-l}$ with $l\le d$ where $d$ is the space dimensionality) are
difficult to study by conventional statistical mechanics perturbation methods.
Examples of these systems are gravitational and charged (non-electroneutral).
In this wo... | 1206.2211v2 |
2012-06-10 | Comments on "Plasma oscillations and nonextensive statistics" | The paper, authored by J. A. S. Lima et al, was published in Phys. Rev. E in
2000 has discussed the dispersion relation and Landau damping of Langmuir wave
in the context of the nonextensive statistics proposed by Tsallis. It has been
cited by many authors because the dispersion relation in Tsallis formalism
present a ... | 1206.2345v1 |
2012-06-25 | Ideal MHD Ballooning modes, shear flow and the stable continuum | There is a well established theory of Ballooning modes in a toroidal plasma.
The cornerstone of this is a local eigenvalue lambda on each magnetic surface -
which also depends on the ballooning phase angle k. In stationary plasmas
lambda(k) is required only near its maximum, but in rotating plasmas its
average over k i... | 1206.5855v2 |
2012-06-26 | A Numerical Perspective on Hartree-Fock-Bogoliubov Theory | The method of choice for describing attractive quantum systems is
Hartree-Fock-Bogoliubov (HFB) theory. This is a nonlinear model which allows
for the description of pairing effects, the main explanation for the
superconductivity of certain materials at very low temperature. This paper is
the first study of Hartree-Foc... | 1206.6081v1 |
2012-06-27 | Dynamics of zonal flow-like structures in the edge of the TJ-II stellarator | The dynamics of fluctuating electric field structures in the edge of the
TJ-II stellarator, that display zonal flow-like traits, is studied. These
structures have been shown to be global and affect particle transport
dynamically [J.A. Alonso et al., Nucl. Fus. 52 063010 (2012)]. In this article
we discuss possible driv... | 1206.6191v1 |
2012-07-13 | Decay of capillary wave turbulence | We report on the observation of freely decaying capillary wave turbulence on
the surface of a fluid. The capillary wave turbulence spectrum decay is found
to be self-similar in time with the same power law exponent than the one found
in the stationary regime, in agreement with weak turbulence predictions. The
amplitude... | 1207.3228v1 |
2012-07-17 | Holographic Superfluids and the Dynamics of Symmetry Breaking | We explore the far from equilibrium response of a holographic superfluid
using the AdS/CFT correspondence. We establish the dynamical phase diagram
corresponding to quantum quenches of the order parameter source field. We find
three distinct regimes of behaviour that are related to the spectrum of black
hole quasi-norm... | 1207.4194v2 |
2012-07-26 | Generic Mechanism of Optimal Energy Transfer Efficiency: A Scaling Theory of the Mean First Passage Time in Exciton Systems | An asymptotic scaling theory is presented using the conceptual basis of
trapping-free subspace (i.e., orthogonal subspace) to establish the generic
mechanism of optimal efficiency of excitation energy transfer (EET) in
light-harvesting systems. Analogous to Kramers' turnover in classical rate
theory, the enhanced effic... | 1207.6197v1 |
2012-07-27 | Dissipative and Non-dissipative Single-Qubit Channels: Dynamics and Geometry | Single-qubit channels are studied under two broad classes: amplitude damping
channels and generalized depolarizing channels. A canonical derivation of the
Kraus representation of the former, via the Choi isomorphism is presented for
the general case of a system's interaction with a squeezed thermal bath. This
isomorphi... | 1207.6519v1 |
2012-07-27 | Phonon Effects on Population Inversion in Quantum Dots: Resonant, Detuned and Frequency-swept Excitations | The effect of acoustic phonons on different light-induced excitations of a
semiconductor quantum dot is investigated. Resonant excitation of the quantum
dot leads to Rabi oscillations, which are damped due to the phonon interaction.
When the excitation frequency is detuned, an occupation can only occur due to
phonon ab... | 1207.6660v2 |
2012-07-28 | Ultrafast optical control of magnetization in EuO thin films | All-optical pump-probe detection of magnetization precession has been
performed for ferromagnetic EuO thin films at 10 K. We demonstrate that the
circularly-polarized light can be used to control the magnetization precession
on an ultrafast time scale. This takes place within the 100 fs duration of a
single laser pulse... | 1207.6686v1 |
2012-08-07 | Observation of Coherent Helimagnons and Gilbert damping in an Itinerant Magnet | We study the magnetic excitations of itinerant helimagnets by applying
time-resolved optical spectroscopy to Fe0.8Co0.2Si. Optically excited
oscillations of the magnetization in the helical state are found to disperse to
lower frequency as the applied magnetic field is increased; the fingerprint of
collective modes uni... | 1208.1462v1 |
2012-08-08 | Mechanism of collisionless sound damping in dilute Bose gas with condensate | We develop a microscopic theory of sound damping due to Landau mechanism in
dilute gas with Bose condensate. It is based on the coupled evolution equations
of the parameters describing the system. These equations have been derived in
earlier works within a microscopic approach which employs the
Peletminskii-Yatsenko re... | 1208.1653v2 |
2012-08-17 | Detection of domain wall eigenfrequency in infinity-shaped magnetic nanostructures | The dynamics of a magnetic infinity-shaped nanostructure has been
experimentally studied by two different techniques such as the sinusoidal
resonance excitation and the damped short pulse excitation to measure the
eigenfrequency of domain walls. Direct observation of the magnetic domain wall
nucleation has been measure... | 1208.3527v1 |
2012-08-21 | Stress field and spin axis relaxation for inelastic triaxial ellipsoids | A compact formula for the stress tensor inside a self-gravitating, triaxial
ellipsoid in an arbitrary rotation state is given. It contains no singularity
in the incompressible medium limit. The stress tensor and the quality factor
model are used to derive a solution for the energy dissipation resulting in the
damping (... | 1208.4283v2 |
2012-08-22 | On unorthodox solutions of the Bloch equations | A systematic, rigorous, and complete investigation of the Bloch equations in
time-harmonic driving classical field is performed. Our treatment is unique in
that it takes full advantage of the partial fraction decomposition over real
number field, which makes it possible to find and classify all analytic
solutions. Torr... | 1208.5736v1 |
2012-08-29 | Optically mediated nonlinear quantum optomechanics | We consider theoretically the optomechanical interaction of several
mechanical modes with a single quantized cavity field mode for linear and
quadratic coupling. We focus specifically on situations where the optical
dissipation is the dominant source of damping, in which case the optical field
can be adiabatically elim... | 1208.5821v1 |
2012-08-31 | Spectrums of Black Hole in de Sitter Spacetime with Highly Damped Quasinormal Modes: High Overtone Case | Motivated by recent physical interpretation on quasinormal modes presented by
Maggiore, the adiabatic quantity method given by Kunstatter is used to
calculate the spectrums of a non-extremal Schwarzschild de Sitter black hole in
this paper, as well as electrically charged case. According to highly damped
Konoplya and Z... | 1208.6485v1 |
2012-09-10 | Rapid ramps across the BEC-BCS crossover: a novel route to measuring the superfluid gap | We investigate the response of superfluid Fermi gases to rapid changes of the
three-dimensional s-wave scattering length a by solving the time-dependent
Bogoliubov-de Gennes equations. In general the magnitude of the order parameter
|\Delta| performs oscillations, which are sometimes called the "Higgs" mode,
with the a... | 1209.2025v1 |
2012-09-12 | Loss of Landau Damping for Bunch Oscillations | Conditions for the existence, uniqueness and stability of self-consistent
bunch steady states are considered. For the existence and uniqueness problems,
simple algebraic criteria are derived for both the action and Hamiltonian
domain distributions. For the stability problem, van Kampen theory is used. The
onset of a di... | 1209.2715v1 |
2012-09-17 | Generalized fluctuation-dissipation relation and statistics for the equilibrium of a system with conformation dependent damping | Liouville's theorem, based on the Hamiltonian flow (micro-canonical ensemble)
for a many particle system, indicates that the (stationary) equilibrium
probability distribution is a function of the Hamiltonian. A canonical ensemble
corresponds to a micro-canonical one at thermodynamic limit. On the contrary,
the dynamics... | 1209.3654v3 |
2012-09-17 | Nonlinear emission of spin-wave caustics from an edge mode of a micro-structured Co2Mn0.6Fe0.4Si waveguide | Magnetic Heusler materials with very low Gilbert damping are expected to show
novel magnonic transport phenomena. We report nonlinear generation of higher
harmonics leading to the emission of caustic spin-wave beams in a low-damping,
micro-structured Co2Mn0.6Fe0.4Si Heusler waveguide. The source for the higher
harmonic... | 1209.3669v2 |
2012-09-20 | High Resolution BPM Upgrade for the ATF Damping Ring at KEK | A beam position monitor (BPM) upgrade at the KEK Accelerator Test Facility
(ATF) damping ring has been accomplished, carried out by a KEK/FNAL/SLAC
collaboration under the umbrella of the global ILC R&D effort. The upgrade
consists of a high resolution, high reproducibility read-out system, based on
analog and processi... | 1209.4569v1 |
2012-09-23 | Ion Landau Damping on Drift Tearing Modes | Kinetic treatments of drift-tearing modes that match an inner resonant layer
solution to an external MHD region solution, characterised by
$\Delta^{\prime}$, fail to properly match the ideal MHD boundary condition on
the parallel electric field, $E_{\parallel}.$ In this paper we demonstrate how
consideration of ion sou... | 1209.5054v3 |
2012-09-26 | Inverse Energy Cascade in Forced 2D Quantum Turbulence | We demonstrate an inverse energy cascade in a minimal model of forced 2D
quantum vortex turbulence. We simulate the Gross-Pitaevskii equation for a
moving superfluid subject to forcing by a stationary grid of obstacle
potentials, and damping by a stationary thermal cloud. The forcing injects
large amounts of vortex ene... | 1209.5824v2 |
2012-09-27 | Comparison of non-Markovianity criteria in a qubit system under random external fields | We give the map representing the evolution of a qubit under the action of
non-dissipative random external fields. From this map we construct the
corresponding master equation that in turn allows us to phenomenologically
introduce population damping of the qubit system. We then compare, in this
system, the time-regions ... | 1209.6331v2 |
2012-10-01 | Gravitational Coleman-Weinberg Potential and It's Finite Temperature Counterpart | Coleman-Weinberg (CW) phenomena for the case of gravitons minimally coupled
to massless scalar field is studied. The one loop effect completely vanishes if
there is no self interaction term present in the matter sector. The one loop
effective potential is shown to develop an instability in the form of acquiring
an imag... | 1210.0497v4 |
2012-10-09 | Analytic approximate seismology of propagating MHD waves in the solar corona | Observations show that propagating magnetohydrodynamic (MHD) waves are
ubiquitous in the solar atmosphere. The technique of MHD seismology uses the
wave observations combined with MHD wave theory to indirectly infer physical
parameters of the solar atmospheric plasma and magnetic field. Here we present
an analytical se... | 1210.2689v1 |
2012-10-12 | Reversal of magnetization of a single-domain magnetic particle by the ac field of time-dependent frequency | We report numerical and analytical studies of the reversal of the magnetic
moment of a single-domain magnetic particle by a circularly polarized ac field
of time-dependent frequency. For the time-linear frequency sweep, the phase
diagrams are computed that illustrate the dependence of the reversal on the
frequency swee... | 1210.3530v1 |
2012-10-18 | SDO/AIA Observations of Large-Amplitude Longitudinal Oscillations in a Solar Filament | We present the first \emph{Solar Dynamics Observatory}/Atmospheric Imaging
Assembly observations of the large-amplitude longitudinal (LAL) oscillations in
the south and north parts (SP and NP) of a solar filament on 2012 April 7. Both
oscillations are triggered by flare activities close to the filament. The
period vari... | 1210.5110v1 |
2012-10-31 | The Kerr medium as an {\sf SU(2)} system | The Kerr medium in the presence of damping and associated with SU(1,1)
symmetry, is solved using the techniques of Thermo field Dynamics (TFD).These
TFD techniques, well studied earlier (Chaturvedi and Srinivasan, 1991), help us
to exactly solve the Kerr medium as a spin damped system associated with SU(2)
symmetry. Us... | 1210.8240v1 |
2012-11-02 | Dynamic Spin Injection into Chemical Vapor Deposited Graphene | We demonstrate dynamic spin injection into chemical vapor deposition (CVD)
grown graphene by spin pumping from permalloy (Py) layers. Ferromagnetic
resonance measurements at room temperature reveal a strong enhancement of the
Gilbert damping at the Py/graphene interface, exceeding that observed in even
Py/platinum inte... | 1211.0492v1 |
2012-12-06 | A simple and effective Verlet-type algorithm for simulating Langevin dynamics | We present a revision to the well known Stormer-Verlet algorithm for
simulating second order differential equations. The revision addresses the
inclusion of linear friction with associated stochastic noise, and we
analytically demonstrate that the new algorithm correctly reproduces diffusive
behavior of a particle in a... | 1212.1244v4 |
2012-12-10 | Shear viscosity and the r-mode instability window in superfluid neutron stars | We analyze how recent computations of the shear viscosity $\eta$ in the core
of superfluid neutron stars affect the r-mode instability window. We first
analyze the contribution of superfluid phonons to the viscosity, both in their
hydrodynamical and ballistic regime. We also consider the recent computation of
$\eta$ ar... | 1212.2075v2 |
2012-12-12 | The operator sum-difference representation for quantum maps: application to the two-qubit amplitude damping channel | On account of the Abel-Galois no-go theorem for the algebraic solution to
quintic and higher order polynomials, the eigenvalue problem and the associated
characteristic equation for a general noise dynamics in dimension $d$ via the
Choi-Jamiolkowski approach cannot be solved in general via radicals. We provide
a way ar... | 1212.2780v1 |
2012-12-13 | Efficiency improvement of the frequency-domain BEM for rapid transient elastodynamic analysis | The frequency-domain fast boundary element method (BEM) combined with the
exponential window technique leads to an efficient yet simple method for
elastodynamic analysis. In this paper, the efficiency of this method is further
enhanced by three strategies. Firstly, we propose to use exponential window
with large dampin... | 1212.3032v2 |
2012-12-16 | Decay of the solution to the bipolar Euler-Poisson system with damping in $\mathbb{R}^3$ | We construct the global solution to the Cauchy's problem of the bipolar
Euler-Poisson equations with damping in $\mathbb{R}^3$ when $H^3$ norm of the
initial data is small. If further, the $\dot{H}^{-s}$ norm ($0\leq s<3/2)$ or
$\dot{B}_{2,\infty}^{-s}$ norm ($0<s\leq3/2$) of the initial data is bounded,
we give the op... | 1212.3754v2 |
2012-12-24 | Effects of kappa distribution function on Landau damping in electrostatic Vlasov simulation | Effects of non-thermal high-energy electrons on Langmuir wave-particle
interaction are investigated by an initial value approach. A Vlasov-Poisson
simulation is employed which is based on the splitting scheme by Cheng and
Knorr [Cheng, C.Z. and G. Knorr, 1976: J. Comput. Phys. 22, 330-351.]. The
kappa distribution func... | 1212.5872v1 |
2012-12-26 | Anomalous dynamic back-action in interferometers | We analyze the dynamic optomechanical back-action in signal-recycled
Michelson and Michelson-Sagnac interferometers that are operated off dark port.
We show that in this case --- and in contrast to the well-studied canonical
form of dynamic back-action on dark port --- optical damping in a
Michelson-Sagnac interferomet... | 1212.6242v2 |
2013-01-01 | A scattering approach to some aspects of the Schwarzschild Black Hole | In this paper, we consider a massless field, with spin j, in interaction with
a Schwarzschild black hole in four dimensions, focusing mainly our study on the
s-wave scattering. First, using a Fourier analysis, we show that one can have a
simple and natural description of the Physics near the event horizon without
using... | 1301.0108v1 |
2013-01-02 | Memory models of adaptive behaviour | Adaptive response to a varying environment is a common feature of biological
organisms. Reproducing such features in electronic systems and circuits is of
great importance for a variety of applications. Here, we consider memory models
inspired by an intriguing ability of slime molds to both memorize the period of
tempe... | 1301.0209v2 |
2013-01-03 | Collective modes of a two-dimensional spin-1/2 Fermi gas in a harmonic trap | We derive analytical expressions for the frequency and damping of the lowest
collective modes of a two-dimensional Fermi gas using kinetic theory. For
strong coupling, we furthermore show that pairing correlations overcompensate
the effects of Pauli blocking on the collision rate for a large range of
temperatures, resu... | 1301.0358v2 |
2013-01-09 | Synthesis of new neutron-rich heavy nuclei: An experimentalist's view | I attempt to experimentally evaluate the prospects of synthesizing new
neutron- rich superheavy nuclei. I consider three possible synthetic paths to
neutron- rich superheavy nuclei: (a) the use of neutron-rich radioactive beams.
(b) the use of damped collisions and (c) the use of multi-nucleon transfer
reactions. I con... | 1301.1759v1 |
2013-01-10 | First-principles calculation of the Gilbert damping parameter via the linear response formalism with application to magnetic transition-metals and alloys | A method for the calculations of the Gilbert damping parameter $\alpha$ is
presented, which based on the linear response formalism, has been implemented
within the fully relativistic Korringa-Kohn-Rostoker band structure method in
combination with the coherent potential approximation alloy theory. To account
for therma... | 1301.2114v1 |
2013-01-13 | Entanglement dynamics of non-inertial observers in a correlated environment | Effect of decoherence and correlated noise on the entanglement of X-type
state of the Dirac fields in the non-inertial frame is investigated. A two
qubit X-state is considered to be shared between the partners where Alice is in
inertial frame and Rob in an accelerated frame. The concurrence is used to
quantify the enta... | 1301.2759v1 |
2013-01-13 | Decoherence and multipartite entanglement of non-inertial observers | Decoherence effect on multipartite entanglement in non-inertial frames is
investigated. GHZ state is considered to be shared between the partners with
one partner in inertial frame whereas the other two in accelerated frames.
One-tangle and {\pi}-tangles are used to quantify the entanglement of the
multipartite system ... | 1301.2765v2 |
2013-01-18 | Current induced torques and interfacial spin-orbit coupling: Semiclassical Modeling | In bilayer nanowires consisting of a ferromagnetic layer and a non-magnetic
layer with strong spin-orbit coupling, currents create torques on the
magnetization beyond those found in simple ferromagnetic nanowires. The
resulting magnetic dynamics appear to require torques that can be separated
into two terms, damping-li... | 1301.4513v1 |
2013-01-25 | Driven skyrmions and dynamical transitions in chiral magnets | We study the dynamics of skyrmions in chiral magnets in the presence of a
spin polarized current. The motion of skyrmions in the ferromagnetic background
excites spin waves and contributes to additional damping. At a large current,
the spin wave spectrum becomes gapless and skyrmions are created dynamically
from the fe... | 1301.5963v2 |
2013-02-13 | Entanglement of Tripartite States with Decoherence in Noninertial frames | The one-tangle and {\pi}-tangle are used to quantify the entanglement of a
tripartite GHZ state in noninertial frames when the system interacts with a
noisy environment in the form of phase damping, phase flip and bit flip
channel. It is shown that the two-tangles behave as a closed system. The
one-tangle and {\pi}-tan... | 1302.3005v1 |
2013-02-17 | Global existence and exponential growth for a viscoelastic wave equation with dynamic boundary conditions | The goal of this work is to study a model of the wave equation with dynamic
boundary conditions and a viscoelastic term. First, applying the Faedo-Galerkin
method combined with the fixed point theorem, we show the existence and
uniqueness of a local in time solution. Second, we show that under some
restrictions on the ... | 1302.4036v1 |
2013-02-22 | Mixing of blackbodies: Increasing our view of inflation to 17 e-folds with spectral distortions from Silk damping | Silk damping in the early Universe, before and during recombination, erases
anisotropies in the cosmic microwave background (CMB) on small scales. This
power, which disappears from anisotropies, appears in the monopole as y-type,
i-type and \mu-type distortions. The observation of the CMB spectral
distortions will thus... | 1302.5633v1 |
2013-02-26 | Tenfold reduction of Brownian noise in optical interferometry | Thermally induced fluctuations impose a fundamental limit on precision
measurement. In optical interferometry, the current bounds of stability and
sensitivity are dictated by the excess mechanical damping of the
high-reflectivity coatings that comprise the cavity end mirrors. Over the
preceding decade, the mechanical l... | 1302.6489v1 |
2013-03-01 | Quantum error correction and detection: quantitative analysis of a coherent-state amplitude damping code | We re-examine a non-Gaussian quantum error correction code designed to
protect optical coherent-state qubits against errors due to an amplitude
damping channel. We improve on a previous result [Phys. Rev. A 81, 062344
(2010)] by providing a tighter upper bound on the performance attained when
considering realistic assu... | 1303.0273v2 |
2013-03-04 | Transverse oscillations in solar spicules induced by propagating Alfvenic pulses | The excitation of Alfvenic waves in the solar spicules due to the localized
Alfvenic pulse is investigated. A set of incompressible MHD equations in two
dimensional $x-z$ plane with steady flows and sheared magnetic fields is
solved. Stratification due to gravity and transition region between
chromosphere and corona ar... | 1303.0833v1 |
2013-03-04 | Tidal damping of the mutual inclination in hierachical systems | Hierarchical two-planet systems, in which the inner body's semi-major axis is
between 0.1 and 0.5 AU, usually present high eccentricity values, at least for
one of the orbits. As a result of the formation process, one may expect that
planetary systems with high eccentricities also have high mutual inclinations.
However... | 1303.0864v2 |
2013-03-05 | Anomalous velocity distributions in active Brownian suspensions | Large scale simulations and analytical theory have been combined to obtain
the non-equilibrium velocity distribution, $f(v)$, of randomly accelerated
particles in suspension. The simulations are based on an event-driven
algorithm, generalised to include friction. They reveal strongly anomalous but
largely universal dis... | 1303.0996v3 |
2013-03-07 | Quantum critical metals in $d=3+1$ | We study the problem of disorder-free metals near a continuous Ising nematic
quantum critical point in $d=3+1$ dimensions. We begin with perturbation theory
in the `Yukawa' coupling between the electrons and undamped bosons (nematic
order parameter fluctuations) and show that the perturbation expansion breaks
down belo... | 1303.1587v2 |
2013-03-08 | Ultra High Energy Electrons Powered by Pulsar Rotation | A new mechanism of particle acceleration to ultra high energies, driven by
the rotational slow down of a pulsar (Crab pulsar, for example), is explored.
The rotation, through the time dependent centrifugal force, can very
efficiently excite unstable Langmuir waves in the e-p plasma of the star
magnetosphere via a param... | 1303.2093v1 |
2013-04-01 | Fidelity of remote state preparation can be enhanced by local operation | Remote state preparation (RSP) is a quantum information protocol which allows
preparing a quantum state at a distant location with the help of a preshared
nonclassical resource state and a classical channel. The efficiency of
successfully doing this task can be represented by the RSP-fidelity of the
resource state. In ... | 1304.0283v1 |
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