publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2007-02-07 | Damping of antiferromagnetic spin waves by valence fluctuations in the double layer perovskite YBaFe2O5 | Inelastic neutron scattering experiments show that spin dynamics in the
charge ordered insulating ground state of the double-layer perovskite YBaFe2O5
is well described in terms of eg superexchange interactions. Above the Verwey
transition at TV = 308 K, t2g double exchange-type conduction within
antiferromagnetic FeO2... | 0702181v1 |
2007-02-20 | Spin Drag and Spin-Charge Separation in Cold Fermi Gases | Low-energy spin and charge excitations of one-dimensional interacting
fermions are completely decoupled and propagate with different velocities.
These modes however can decay due to several possible mechanisms. In this paper
we expose a new facet of spin-charge separation: not only the speeds but also
the damping rates... | 0702466v1 |
1996-07-23 | Quasinormal modes of nearly extreme Reissner-Nordstrom black holes | We present detailed calculations of the quasinormal modes of
Reissner-Nordstrom black holes. While the first few, slowly damped, modes
depend on the charge of the black hole in a relatively simple way, we find that
the rapidly damped modes show several peculiar features. The higher modes
generally spiral into the value... | 9607054v1 |
1996-08-22 | Gravitational Ionization: A Chaotic Net in the Kepler System | The long term nonlinear dynamics of a Keplerian binary system under the
combined influences of gravitational radiation damping and external tidal
perturbations is analyzed. Gravitational radiation reaction leads the binary
system towards eventual collapse, while the external periodic perturbations
could lead to the ion... | 9608054v1 |
1999-11-11 | Inertial Control of the VIRGO Superattenuator | The VIRGO superattenuator (SA) is effective in depressing the seismic noise
below the thermal noise level above 4 Hz. On the other hand, the residual
mirror motion associated to the SA normal modes can saturate the dynamics of
the interferometer locking system. This motion is reduced implementing a
wideband (DC-5 Hz) m... | 9911044v1 |
2002-10-30 | Massive charged scalar field in a Reissner-Nordstrom black hole background: quasinormal ringing | We compute characteristic (quasinormal) frequencies corresponding to decay of
a massive charged scalar field in a Reissner-Nordstrom black hole background.
It proves that, contrary to the behavior at very late times, at the stage of
quasinormal ringing the neutral perturbations will damp slower than the charged
ones. I... | 0210105v3 |
2003-03-20 | Dirac Quasi-Normal Modes in Schwarzschild Black Hole Spacetimes | We evaluate both the massless and the massive Dirac quasi-normal mode
frequencies in the Schwarzschild black hole spacetime using the WKB
approximation. For the massless case, we find that, similar to those for the
integral spin fields, the real parts of the frequencies increase with the
angular momentum number $\kappa... | 0303078v1 |
2003-07-31 | Effects of electrical charging on the mechanical Q of a fused silica disk | We report on the effects of an electrical charge on mechanical loss of a
fused silica disk. A degradation of Q was seen that correlated with charge on
the surface of the sample. We examine a number of models for charge damping,
including eddy current damping and loss due to polarization. We conclude that
rubbing fricti... | 0308001v1 |
2004-09-15 | Rippled Cosmological Dark Matter from Damped Oscillating Newton Constant | Let the reciprocal Newton 'constant' be an apparently non-dynamical
Brans-Dicke scalar field damped oscillating towards its General Relativistic
VEV. We show, without introducing additional matter fields or dust, that the
corresponding cosmological evolution averagely resembles, in the Jordan frame,
the familiar dark r... | 0409059v2 |
2004-10-06 | Thermoelastic-damping noise from sapphire mirrors in a fundamental-noise-limited interferometer | We report the first high-precision interferometer using large sapphire
mirrors, and we present the first direct, broadband measurements of the
fundamental thermal noise in these mirrors. Our results agree well with the
thermoelastic-damping noise predictions of Braginsky, et al. [Phys. Lett. A
264, 1(1999)] and Cerdoni... | 0410028v1 |
2004-10-28 | Gravitational waves from neutron stars described by modern EOS | The frequencies and damping times of neutron star (and quark star)
oscillations have been computed using the most recent equations of state
available in the literature. We find that some of the empirical relations that
connect the frequencies and damping times of the modes to the mass and radius
of the star, and that w... | 0410140v1 |
2005-06-08 | Resonant growth of stellar oscillations by incident gravitational waves | Stellar oscillation under the combined influences of incident gravitational
wave and radiation loss is studied in a simple toy model. The star is
approximated as a uniform density ellipsoid in the Newtonian gravity including
radiation damping through quadrupole formula. The time evolution of the
oscillation is signific... | 0506047v1 |
2006-11-28 | Massive scalar field quasinormal modes of a Schwarzschild black hole surrounded by quintessence | We present the quasinormal frequencies of the massive scalar field in the
background of a Schwarzchild black hole surrounded by quintessence with the
third-order WKB method. The mass of the scalar field $u$ plays an important
role in studying the quasinormal frequencies, the real part of the frequencies
increases linea... | 0611146v2 |
1992-09-24 | Non-Abelian Boltzmann Equation for Mixing and Decoherence | We consider particle oscillations and their damping in second-quantized form.
We find that the damping or "decoherence" may be described by a Boltzmann-like
collision integral with "non-abelian blocking factors" (fermions). Earlier
results are generalized in that the momentum degrees of freedom are included
and that th... | 9209276v1 |
1993-06-03 | The heavy fermion damping rate puzzle | : We examine again the problem of the damping rate of a moving heavy fermion
in a hot plasma within the resummed perturbative theory of Pisarski and
Braaten. The ansatz for its evaluation which relates it to the imaginary part
of the fermion propagator pole in the framework of a self-consistent approach
is critically a... | 9306219v1 |
1993-09-03 | Damping Rate of a Fermion in a Medium | We examine the relation between the damping rate of a massless, chiral
fermion that propagates in a medium, and the rate $\Gamma$ of approach to
equilibrium. It is proven that these quantities are equal, by showing that they
are given by the same formula in terms of the imaginary part of the self-energy
evaluated at th... | 9309225v2 |
1994-03-22 | On the Damping Rate of a Fast Fermion in Hot QED | The self-consistent determination of the damping rate of a fast moving
fermion in a hot QED plasma is reexamined. We argue how a detailed
investigation of the analytic properties of the retarded fermion Green's
function motivated by the cutting rules at finite temperature may resolve
ambiguities related to the proper d... | 9403335v1 |
1994-09-12 | Fermion damping rate in a hot medium | In principle every excitation acquires a finite lifetime in a hot system.
This nonzero spectral width is calculated self-consistently for massive
fermions coupled to massless scalar, vector and pseudoscalar bosons. It is
shown that the self-consistent summation of the corresponding Fock diagram for
fermions eliminates ... | 9409280v2 |
1994-09-22 | Lyapunov Exponent and Plasmon Damping Rate in Nonabelian Gauge Theories | We explain why the maximal positive Lyapunov exponent of classical SU($N$)
gauge theory coincides with (twice) the damping rate of a plasmon at rest in
the leading order of thermal gauge theory. [This is a substantially revised and
expanded version of the manuscript.] | 9409392v2 |
1994-12-20 | Baryogenesis and damping in nonminimal electroweak models | We study the effect of damping on the generation of baryon asymmetry of the
Universe in the standard model of the eletroweak theory with simple extensions
of the Higgs sector. The propagation of quarks of masses up to about 5 GeV are
considered, taking into account their markedly different dispersion relations
due to i... | 9412330v1 |
1998-10-07 | Classical Kinetic Theory of Landau Damping for Self-interacting Scalar Fields in the Broken Phase | The classical kinetic theory of one-component self-interacting scalar fields
is formulated in the broken symmetry phase and applied to the phenomenon of
Landau damping. The domain of validity of the classical approach is found by
comparing with the result of a 1-loop quantum calculation. | 9810278v2 |
1999-08-02 | Plasma wave instabilities induced by neutrinos | Quantum field theory is applied to study the interaction of an electron
plasma with an intense neutrino flux. A connection is established between the
field theory results and classical kinetic theory. The dispersion relation and
damping rate of the plasma longitudinal waves are derived in the presence of
neutrinos. It ... | 9908206v2 |
1999-09-27 | Radiation Damping at a Bubble Wall | The first order phase transition proceeds via nucleation and growth of true
vacuum bubbles. When charged particles collide with the bubble they could
radiate electromagnetic wave. We show that, due to an energy loss of the
particles by the radiation, the damping pressure acting on the bubble wall
depends on the velocit... | 9909521v1 |
1999-10-08 | Lifetime of Collective Isospin Rotations of a Quantum Meson Field | We calculate the lifetime of the collective isospin rotating solutions which
have been found recently in the case a quantum N-component meson field with
exact O(N) symmetry. For this purpose we take into account the small breaking
of the O(N) symmetry associated to the non vanishing mass of the pion. This
term induces ... | 9910276v1 |
2000-02-08 | Finite pion width effects on the rho-meson and di-lepton spectra | Within a field theoretical model where all damping width effects are treated
self-consistently we study the changes of the spectral properties of rho-mesons
due to the finite damping width of the pions in dense hadronic matter at finite
temperature. The corresponding effects in the di-lepton yields are presented.
Some ... | 0002087v1 |
2000-08-31 | Damping of very soft moving quarks in high-temperature QCD | We determine the analytic expression of the damping rates for very soft
moving quarks in an expansion to second order in powers of their momentum in
the context of QCD at high temperature. The calculation is performed using the
hard-thermal-loop-summed perturbation scheme. We describe the range of validity
of the expan... | 0008335v1 |
2000-09-27 | Damping of the HERA effect in DIS? | The drastic rise of the proton structure function F_2(x,Q^2) when the
Bj\"orken variable x decreases, seen at HERA for a large span of Q^2, negative
values for the 4-momentum transfer, may be damped when Q^2 increases beyond
several hundreds GeV^2. A new data analysis and a comparison with recent models
for the proton ... | 0009313v2 |
2001-12-13 | Time evolution in linear response: Boltzmann equations and beyond | In this work a perturbative linear response analysis is performed for the
time evolution of the quasi-conserved charge of a scalar field. One can find
two regimes, one follows exponential damping, where the damping rate is shown
to come from quantum Boltzmann equations. The other regime (coming from
multiparticle cuts ... | 0112188v1 |
2002-04-26 | Oscillation damping of chiral string loops | Chiral cosmic string loop tends to the stationary (vorton) configuration due
to the energy loss into the gravitational and electromagnetic radiation. We
describe the asymptotic behaviour of near stationary chiral loops and their
fading to vortons. General limits on the gravitational and electromagnetic
energy losses by... | 0204304v1 |
2004-02-06 | Critical Behavior of Damping Rate for Plasmon with Finite Momentum in φ^4 Theory | Applying thermal renormalization group (TRG) equations to $\phi^4$ theory
with spontaneous breaking symmetry, we investigate the critical behavior of the
damping rate for the plasmons with finite momentum at the symmetry-restoring
phase transition. From the TRG equation the IR cutoff provided by the external
momentum l... | 0402069v2 |
2005-11-22 | Ultrasoft Quark Damping in Hot QCD | We determine the quark damping rates in the context of next-to-leading order
hard-thermal-loop summed perturbation of high-temperature QCD where weak
coupling is assumed. The quarks are ultrasoft. Three types of divergent
behavior are encountered: infrared, light-cone and at specific points
determined by the gluon ener... | 0511258v1 |
2006-03-10 | Numerical Approach to Multi Dimensional Phase Transitions | We present an algorithm to analyze numerically the bounce solution of
first-order phase transitions. Our approach is well suited to treat phase
transitions with several fields. The algorithm consists of two parts. In the
first part the bounce solution without damping is determined, in which case
energy is conserved. In... | 0603081v2 |
1994-06-22 | Damped quantum harmonic oscillator: density operator and related quantities | A closed expression for the density operator of the damped harmonic
oscillator is extracted from the master equation based on the Lindblad theory
for open quantum systems. The entropy and effective temperature of the system
are subsequently calculated and their temporal behaviour is surveyed by showing
how these quanti... | 9406142v1 |
1997-05-09 | Radiation Damping of a BPS Monopole; an Implication to S-duality | The radiation reaction of a BPS monopole in the presence of incident
electromagnetic waves as well as massless Higgs waves is analyzed classically.
The reactive forces are compared to those of $W$ boson that is interpreted as a
dual partner of the BPS monopole. It is shown that the damping of acceleration
is dual to ea... | 9705059v2 |
1997-07-02 | The Asymptotic Method Developed from Weak Turbulent Theory and the Nonlinear Permeability and Damping Rate in QGP | With asymptotic method developed from weak turbulent theory, the kinetic
equations for QGP are expanded in fluctuation field potential $A^T_\mu $.
Considering the second-order and third-order currents, we derive the nonlinear
permeability tensor function from Yang-Mills field equation, and find that the
third-order cur... | 9707052v1 |
2005-04-07 | Continuous area spectrum in regular black hole | We investigate highly damped quasinormal modes of regular black hole coupled
to nonlinear electrodynamics. Using the WKB approximation combined with
complex-integration technique, we show that the real part of the frequency
disappears in the highly damped limit. If we use the Bohr's correspondence
principle, the area s... | 0504059v2 |
2005-05-16 | Supersymmetrization of the Radiation Damping | We construct a supersymmetrized version of the model to the radiation damping
\cite{03} introduced by the present authors \cite{ACWF}. We dicuss its
symmetries and the corresponding conserved Noether charges. It is shown this
supersymmetric version provides a supersymmetric generalization of the Galilei
algebra obtaine... | 0505142v1 |
1999-08-16 | Topological Entropy and epsilon-Entropy for Damped Hyperbolic Equations | We study damped hyperbolic equations on the infinite line. We show that on
the global attracting set $G$ the $\epsilon$-entropy (per unit length) exists
in the topology of $W^{1,\infty}$. We also show that the topological entropy
per unit length of $G$ exists. These results are shown using two main
techniques: Bounds i... | 9908080v1 |
2003-11-28 | Uniform stability of damped nonlinear vibrations of an elastic string | Here we are concerned about uniform stability of damped nonlinear transverse
vibrations of an elastic string fixed at its two ends. The vibrations governed
by nonlinear integro-differential equation of Kirchoff type, is shown to
possess energy uniformly bounded by exponentially decaying function of time.
The result is ... | 0311527v1 |
2005-07-06 | On stability and stabilization of elastic systems by time-variant feedback | We study a class of elastic systems described by a (hyperbolic) partial
differential equation. Our working example is the equation of a vibrating
string subject to linear disturbance. The main goal is to establish conditions
for stabilization and asymptotic stabilization by applying a fast oscillating
control to the st... | 0507123v1 |
2006-01-13 | Attractors for damped hyperbolic equations on arbitrary unbounded domains | We prove existence of global attractors for damped hyperbolic equations of
the form $$\aligned \eps u_{tt}+\alpha(x) u_t+\beta(x)u- \sum_{ij}(a_{ij}(x)
u_{x_j})_{x_i}&=f(x,u),\quad x\in \Omega, t\in[0,\infty[, u(x,t)&=0,\quad x\in
\partial \Omega, t\in[,\infty[.\endaligned$$ on an unbounded domain $\Omega$,
without smo... | 0601319v3 |
2007-02-07 | Finite time blow-up results for the damped wave equations with arbitrary initial energy in an inhomogeneous medium | In this paper we consider the long time behavior of solutions of the initial
value problem for the damped wave equation of the form \begin{eqnarray*}
u_{tt}-\rho(x)^{-1}\Delta u+u_t+m^2u=f(u) \end{eqnarray*} with some $\rho(x)$
and $f(u)$ on the whole space $\R^n$ ($n\geq 3$).
For the low initial energy case, which i... | 0702190v1 |
2007-03-09 | Analyticity and Riesz basis property of semigroups associated to damped vibrations | Second order equations of the form $z'' + A_0 z + D z'=0$ in an abstract
Hilbert space are considered. Such equations are often used as a model for
transverse motions of thin beams in the presence of damping. We derive various
properties of the operator matrix $A$ associated with the second order problem
above. We deve... | 0703247v1 |
2007-03-21 | Existence and asymptotic behavior of $C^1$ solutions to the multidimensional compressible Euler equations with damping | In this paper, the existence and asymptotic behavior of $C^1$ solutions to
the multidimensional compressible Euler equations with damping on the framework
of Besov space are considered. We weaken the regularity requirement of the
initial data, and improve the well-posedness results of Sideris-Thomases-Wang
(Comm.P.D.E.... | 0703621v1 |
2000-12-22 | The Vlasov-Poisson system with radiation damping | We set up and analyze a model of radiation damping within the framework of
continuum mechanics, inspired by a model of post-Newtonian hydrodynamics due to
Blanchet, Damour and Schaefer. In order to simplify the problem as much as
possible we replace the gravitational field by the electromagnetic field and
the fluid by ... | 0012041v1 |
2003-01-17 | Quantum mechanics of damped systems | We show that the quantization of a simple damped system leads to a
self-adjoint Hamiltonian with a family of complex generalized eigenvalues. It
turns out that they correspond to the poles of energy eigenvectors when
continued to the complex energy plane. Therefore, the corresponding generalized
eigenvectors may be int... | 0301024v3 |
2003-07-23 | Quantum Mechanics of Damped Systems II. Damping and Parabolic Potential Barrier | We investigate the resonant states for the parabolic potential barrier known
also as inverted or reversed oscillator. They correspond to the poles of
meromorphic continuation of the resolvent operator to the complex energy plane.
As a byproduct we establish an interesting relation between parabolic cylinder
functions (... | 0307047v1 |
2001-07-02 | Pattern formation and localization in the forced-damped FPU lattice | We study spatial pattern formation and energy localization in the dynamics of
an anharmonic chain with quadratic and quartic intersite potential subject to
an optical, sinusoidally oscillating field and a weak damping. The
zone-boundary mode is stable and locked to the driving field below a critical
forcing that we det... | 0107002v1 |
2003-06-16 | On the influence of noise on chaos in nearly Hamiltonian systems | The simultaneous influence of small damping and white noise on Hamiltonian
systems with chaotic motion is studied on the model of periodically kicked
rotor. In the region of parameters where damping alone turns the motion into
regular, the level of noise that can restore the chaos is studied. This
restoration is create... | 0306024v1 |
2003-07-30 | Faraday Wave Pattern Selection Via Multi-Frequency Forcing | We use symmetry considerations to investigate how damped modes affect pattern
selection in multi-frequency forced Faraday waves. We classify and tabulate the
most important damped modes and determine how the corresponding resonant triad
interactions depend on the forcing parameters. The relative phase of the
forcing te... | 0307056v1 |
2004-10-21 | Stabilization mechanism for two-dimensional solitons in nonlinear parametric resonance | We consider a simple model system supporting stable solitons in two
dimensions. The system is the parametrically driven damped nonlinear
Schr\"odinger equation, and the soliton stabilises for sufficiently strong
damping. The purpose of this note is to elucidate the stabilisation mechanism;
we do this by reducing the pa... | 0410044v1 |
2006-01-14 | Vibration of the Duffing Oscillator: Effect of Fractional Damping | We have applied the Melnikov criterion to examine a global homoclinic
bifurcation and transition to chaos in a case of the Duffing system with
nonlinear fractional damping and external excitation.
Using perturbation methods we have found a critical forcing amplitude above
which the system may behave chaotically.
Th... | 0601033v1 |
2006-11-02 | Solitons in strongly driven discrete nonlinear Schrödinger-type models | Discrete solitons in the Ablowitz-Ladik (AL) and discrete nonlinear
Schr\"odinger (DNLS) equations with damping and strong rapid drive are
investigated. The averaged equations have the forms of the parametric AL and
DNLS equations. A new type of parametric bright discrete soliton and cnoidal
waves are found and the sta... | 0611004v1 |
2006-11-26 | On the Lagrangian and Hamiltonian description of the damped linear harmonic oscillator | Using the modified Prelle- Singer approach, we point out that explicit time
independent first integrals can be identified for the damped linear harmonic
oscillator in different parameter regimes. Using these constants of motion, an
appropriate Lagrangian and Hamiltonian formalism is developed and the resultant
canonica... | 0611048v1 |
1992-12-14 | Microscopic Origin of Quantum Chaos in Rotational Damping | The rotational spectrum of $^{168}$Yb is calculated diagonalizing different
effective interactions within the basis of unperturbed rotational bands
provided by the cranked shell model. A transition between order and chaos
taking place in the energy region between 1 and 2 MeV above the yrast line is
observed, associated... | 9212005v1 |
1996-12-17 | Damping mechanisms of the Delta resonance in nuclei | The damping mechanisms of the Delta(1232) resonance in nuclei are studied by
analyzing the quasi-free decay reactions 12C(pi+,pi+ p)11B and 12C(3He,t pi+
p)11B and the 2p emission reactions 12C(pi+,pp)10B and 12C(3He,t pp)10B. The
coincidence cross sections are calculated within the framework of the
isobar-hole model. ... | 9612046v1 |
1997-11-08 | Cooperative damping mechanism of the resonance in the nuclear photoabsorption | We propose a resonance damping mechanism to explain the disappearance of the
peaks around the position of the resonances higher than the $\Delta$ resonance
in the nuclear photoabsorption. This phenomenon is understood by taking into
account the cooperative effect of the collision broadening of $\Delta$ and
$N^{*}$, the... | 9711017v4 |
1998-05-27 | Collisional Damping of Nuclear Collective Vibrations in a Non-Markovian Transport Approach | A detailed derivation of the collisional widths of collective vibrations is
presented in both quantal and semi-classical frameworks by considering the
linearized limits of the extended TDHF and the BUU model with a non-Markovian
binary collision term. Damping widths of giant dipole and giant quadrupole
excitations are ... | 9805050v1 |
1999-07-06 | Probing the width of compound states with rotational gamma rays | The intrinsic width of (multiparticle-multihole) compound states is an
elusive quantity, of difficult direct access, as it is masked by damping
mechanisms which control the collective response of nuclei. Through microscopic
cranked shell model calculations, it is found that the strength function
associated with two-dim... | 9907016v1 |
1999-07-09 | Color plasma oscillation in strangelets | The dispersion relation and damping rate of longitudinal color plasmons in
finite strange quark matter (strangelets) are evaluated in the limits of weak
coupling, low temperature, and long wavelength. The property of the QCD vacuum
surrounding a strangelet makes the frequency of the plasmons nearly the same as
the colo... | 9907039v1 |
1999-09-21 | On the Collisional Damping of Giant Dipole Resonance | Collisional damping widths of giant dipole excitations are calculated in
Thomas-Fermi approximation by employing the microscopic in-medium
cross-sections of Li and Machleidt and the phenomenological Gogny force. The
results obtained in both calculations compare well, but account for about
25-35% of the observed widths ... | 9909057v1 |
2000-01-09 | Strongly damped nuclear collisions: zero or first sound ? | The relaxation of the collective quadrupole motion in the initial stage of a
central heavy ion collision at beam energies $E_{lab}=5\div20$ AMeV is studied
within a microscopic kinetic transport model. The damping rate is shown to be a
non-monotonic function of E_{lab} for a given pair of colliding nuclei. This
fact is... | 0001016v1 |
2002-11-18 | Collision damping in the pi 3He -> d'N reaction near the threshold | We present a simple quantum mechanical model exploiting the optical potential
approach for the description of collision damping in the reaction pi 3He -> d'N
near the threshold, which recently has been measured at TRIUMF. The influence
of the open d'N -> NNN channel is taken into account. It leads to a suppression
fact... | 0211050v1 |
2003-03-14 | Pion damping width from SU(2) x SU(2) NJL model | Within the framework of the NJL model, we investigate the modification of the
pion damping width in a hot pion gas for temperatures ranging from 0 to 180
MeV. The pion is found to broaden noticeably at T > 60 MeV. Near the chiral
phase transition T ~ 180 MeV, the pion width is saturated and amounts to 70
MeV. The main ... | 0303034v1 |
2004-06-09 | Damped collective motion of isolated many body systems within a variational approach to functional integrals | Two improvements with respect to previous formulations are presented for the
calculation of the partition function $\mathcal{Z}$ of small, isolated and
interacting many body systems. By including anharmonicities and employing a
variational approach quantum effects can be treated even at very low
temperatures. A method ... | 0406025v1 |
2004-07-26 | Damped collective motion of many body systems: A variational approach to the quantal decay rate | We address the problem of collective motion across a barrier like encountered
in fission. A formula for the quantal decay rate is derived which bases on a
recently developed variational approach for functional integrals. This formula
can be applied to low temperatures that have not been accessible within the
former PSP... | 0407092v2 |
1997-11-15 | Fluctuational phase-flip transitions in parametrically pumped oscillators | We analyze the rates of noise-induced transitions between period-two
attractors. The model investigated is an underdamped oscillator parametrically
driven by a field at nearly twice the oscillator eigenfrequency. The activation
energy of the transitions is analyzed as a function of the frequency detuning
and field ampl... | 9711014v1 |
1999-05-31 | Collisionless Damping of Low-Frequency Magnetosonic Pulses in a Two-Ion-Species Plasma | Low-frequency mangnetosonic pulses in a two-ion-species plasma are studied
theoretically and by simulation with a one-dimensional electromagnetic
simulation code based on a three-fluid model, with particular attention to the
dynamics of minority heavy ions. It is found that heavy ions can gain some
energy from the puls... | 9905059v1 |
2000-10-17 | Bunch Length Measurements at the ATF Damping Ring in April 2000 | This report presents bunch length and energy spread measurements performed in
April 2000 at the ATF Damping Ring, at KEK. Measurements were performed with
the beam on and then off the linear (difference) coupling resonance. Due to
strong intra-beam scattering in the ATF ring, the results depended strongly on
the coupli... | 0010043v1 |
2000-12-21 | Phase transition in the collisionless regime for wave-particle interaction | Gibbs statistical mechanics is derived for the Hamiltonian system coupling
self-consistently a wave to N particles. This identifies Landau damping with a
regime where a second order phase transition occurs. For nonequilibrium initial
data with warm particles, a critical initial wave intensity is found: above it,
thermo... | 0012053v1 |
2001-09-25 | Creep and Mechanical Oscillator Damping | Although "friction" is included in many models of oscillator damping,
including viscous ones applied to the pendulum; they "miss the mark" with
regard to a conceptual understanding of the mechanisms responsible for energy
loss. The theory of the present paper corrects some of these misunderstandings
by considering the ... | 0109067v1 |
2001-11-06 | Electromagnetic induction and damping - quantitative experiments using PC interface | A bar magnet, attached to an oscillating system, passes through a coil
periodically, generating a series of emf pulses. A novel method is described
for the quantitative verification of Faraday's law which eliminates all errors
associated with angular measurements, thereby revealing delicate features of
the underlying m... | 0111016v1 |
2003-08-31 | Effects of Bulk Viscosity in Non-linear Bubble Dynamics | The non-linear bubble dynamics equations in a compressible liquid have been
modified considering the effects of compressibility of both the liquid and the
gas at the bubble interface. A new bubble boundary equation has been derived,
which includes a new term resulted from the liquid bulk viscosity effects. The
influenc... | 0309012v1 |
2004-04-30 | On violation of the Robinson's damping criterion and enhanced cooling of ion, electron and muon beams in storage rings | Limits of applicability of the Robinson's damping criterion and the problem
of enhanced cooling of particle beams in storage rings beyond the criterion are
discussed. | 0404142v6 |
2004-12-28 | Electron Bernstein waves in spherical tokamak plasmas with "magnetic wells" | In addition to traditional regimes with monotonously increasing magnetic
field, regimes with "magnetic wells" also occur in spherical tokamaks (STs).
The magnetic field profile inversion modifies significantly the whole picture
of the wave propagation and damping. Since the magnetic wells may become quite
common with f... | 0412173v1 |
2005-02-10 | Modulational instabilities in Josephson oscillations of elongated coupled condensates | We study the Josephson oscillations of two coupled elongated condensates.
Linearized calculations show that the oscillating mode uniform over the length
of the condensates (uniform Josephson mode) is unstable : modes of non zero
longitudinal momentum grow exponentially. In the limit of strong atom
interactions, we give... | 0502050v3 |
2005-08-16 | Creep-Enhanced Low-Frequency Sensitivity of Seismometers | The frequency response of a seismometer is typically assumed to be the
textbook case of a viscous damped, simple harmonic oscillator. Real mechanical
oscillators are not ideal, and the damping at low frequencies, due to internal
friction, is presently too poorly understood to describe from first principles.
Even if the... | 0508105v1 |
2006-06-22 | Looking for a time independent Hamiltonian of a dynamical system | In this paper we introduce a method for finding a time independent
Hamiltonian of a given dynamical system by canonoid transformation. We also
find a condition that the system should satisfy to have an equivalent time
independent formulation. We study the example of damped oscillator and give the
new time independent H... | 0606197v2 |
1996-02-27 | Effects of Loss and Decoherence on a Simple Quantum Computer | We investigate the impact of loss (amplitude damping) and decoherence (phase
damping) on the performance of a simple quantum computer which solves the
one-bit Deutsch problem. The components of this machine are beamsplitters and
nonlinear optical Kerr cells, but errors primarily originate from the latter.
We develop mo... | 9602018v1 |
1996-11-25 | The Quantum state diffusion model and the driven damped nonlinear oscillator | We consider a driven damped anharmonic oscillator which classically leads to
a bistable steady state and to hysteresis. The quantum counterpart for this
system has an exact analytical solution in the steady state which does not
display any bistability or hysteresis. We use quantum state diffusion theory to
describe thi... | 9611044v1 |
1997-12-02 | Prevention of dissipation with two particles | An error prevention procedure based on two-particle encoding is proposed for
protecting an arbitrary unknown quantum state from dissipation, such as phase
damping and amplitude damping. The schemes, which exhibits manifestation of the
quantum Zeno effect, is effective whether quantum bits are decohered
independently or... | 9712005v1 |
1998-02-23 | Caldirola-Kanai Oscillator in Classical Formulation of Quantum Mechanics | The quadrature distribution for the quantum damped oscillator is introduced
in the framework of the formulation of quantum mechanics based on the
tomography scheme. The probability distribution for the coherent and Fock
states of the damped oscillator is expressed explicitly in terms of Gaussian
and Hermite polynomials... | 9802057v1 |
1999-03-22 | Decoherence - Fluctuation Relation and Measurement Noise | We discuss fluctuations in the measurement process and how these fluctuations
are related to the dissipational parameter characterising quantum damping or
decoherence. On the example of the measuring current of the variable-barrier or
QPC problem we show there is an extra noise or fluctuation connected with the
possibl... | 9903072v1 |
1999-07-27 | Nonclassical correlations in damped N-solitons | The quantum statistics of damped higher-order optical solitons are analyzed
numerically, using cumulant-expansion techniques in Gaussian approximation. A
detailed analysis of nonclassical properties in both the time and the frequency
domain is given, with special emphasis on the role of absorption. Highly
nonclassical ... | 9907090v2 |
2001-01-08 | Cavity-damping-induced transitions in a driven atom-cavity system | We investigate the fluorescence spectrum of a two-level atom in a cavity when
the atom is driven by a classical field. We show that forbidden dipole
transitions in the Jaynes-Cummings Ladder structure are induced in the presence
of the cavity damping, which deteriorates the degree of otherwise perfect
destructive inter... | 0101036v1 |
2001-06-09 | Squeezing enhancement by damping in a driven atom-cavity system | In a driven atom-cavity coupled system in which the two-level atom is driven
by a classical field, the cavity mode which should be in a coherent state in
the absence of its reservoir, can be squeezed by coupling to its reservoir. The
squeezing effect is enhanced as the damping rate of the cavity is increased to
some ex... | 0106054v1 |
2001-08-01 | Decoherence-induced wave packet splitting | We provide an intuitive interpretation of the optical Stern-Gerlach effect
(OSGE) in the dressed-state point of view. We also analyze the effect of atomic
damping in an experiment on the OSGE. We show that the atomic damping also
causes the wave packet splitting, in a non-mechanical fashion, as opposed to
the coherent ... | 0108005v1 |
2001-08-11 | A Canonical Approach to the Quantization of the Damped Harmonic Oscillator | We provide a new canonical approach for studying the quantum mechanical
damped harmonic oscillator based on the doubling of degrees of freedom
approach. Explicit expressions for Lagrangians of the elementary modes of the
problem, characterising both forward and backward time propagations are given.
A Hamiltonian anal... | 0108055v2 |
2002-05-09 | Implementation of quantum maps by programmable quantum processors | A quantum processor is a device with a data register and a program register.
The input to the program register determines the operation, which is a
completely positive linear map, that will be performed on the state in the data
register. We develop a mathematical description for these devices, and apply it
to several d... | 0205050v1 |
2002-08-28 | Damped Quantum Interference using Stochastic Calculus | It is shown how the phase-damping master equation, either in Markovian and
nonMarkovian regimes, can be obtained as an averaged random unitary evolution.
This, apart from offering a common mathematical setup for both regimes, enables
us to solve this equation in a straightforward manner just by solving the
Schrodinger ... | 0208176v1 |
2002-10-31 | Quantum Markov Channels for Qubits | We examine stochastic maps in the context of quantum optics. Making use of
the master equation, the damping basis, and the Bloch picture we calculate a
non-unital, completely positive, trace-preserving map with unequal damping
eigenvalues. This results in what we call the squeezed vacuum channel. A
geometrical picture ... | 0211001v1 |
2003-01-17 | Concurrence and foliations induced by some 1-qubit channels | We start with a short introduction to the roof concept. An elementary
discussion of phase-damping channels shows the role of anti-linear operators in
representing their concurrence. A general expression for some concurrences is
derived. We apply it to 1-qubit channels of length two, getting induced
foliations of the st... | 0301088v1 |
2003-05-19 | Statistical Effects in the Multistream Model for Quantum Plasmas | A statistical multistream description of quantum plasmas is formulated, using
the Wigner-Poisson system as dynamical equations. A linear stability analysis
of this system is carried out, and it is shown that a Landau-like damping of
plane wave perturbations occurs due to the broadening of the background Wigner
function... | 0305102v1 |
2003-06-28 | Misbelief and misunderstandings on the non--Markovian dynamics of a damped harmonic oscillator | We use the exact solution for the damped harmonic oscillator to discuss some
relevant aspects of its open dynamics often mislead or misunderstood. We
compare two different approximations both referred to as Rotating Wave
Approximation. Using a specific example, we clarify some issues related to
non--Markovian dynamics,... | 0306193v3 |
2003-11-26 | Effective damping in the Raman cooling of trapped ions | We present a method of treating the interaction of a single three-level ion
with two laser beams. The idea is to apply a unitary transformation such that
the exact transformed Hamiltonian has one of the three levels decoupled for all
values of the detunings. When one takes into account damping, the evolution of
the sys... | 0311183v1 |
2004-06-20 | Entanglement-assisted classical information capacity of the amplitude damping channel | In this paper, we calculate the entanglement-assisted classical information
capacity of amplitude damping channel and compare it with the particular mutual
information which is considered as the entanglement-assisted classical
information capacity of this channel in Ref. 6. It is shown that the difference
between them ... | 0406140v1 |
2004-08-13 | Decoherence versus Dynamical Casimir Effect | By means of two simple examples: phase and amplitude damping, the impact of
decoherence on the dynamical Casimir effect is investigated. Even without
dissipating energy (i.e., pure phase damping), the amount of created particles
can be diminished significantly via the coupling to the environment (reservoir
theory) indu... | 0408087v2 |
2004-10-11 | Quantizing the damped harmonic oscillator | We consider the Fermi quantization of the classical damped harmonic
oscillator (dho). In past work on the subject, authors double the phase space
of the dho in order to close the system at each moment in time. For an
infinite-dimensional phase space, this method requires one to construct a
representation of the CAR alg... | 0410078v1 |
2004-11-18 | Drastic effects of damping mechanisms on the third-order optical nonlinearity | We have investigated the optical response of superradiant atoms, which
undergoes three different damping mechanisms: radiative dissipation
($\gamma_r$), dephasing ($\gamma_d$), and nonradiative dissipation
($\gamma_n$). Whereas the roles of $\gamma_d$ and $\gamma_n$ are equivalent in
the linear susceptibility, the thir... | 0411129v1 |
2005-01-19 | Stabilizing an atom laser using spatially selective pumping and feedback | We perform a comprehensive study of stability of a pumped atom laser in the
presence of pumping, damping and outcoupling. We also introduce a realistic
feedback scheme to improve stability by extracting energy from the condensate
and determine its effectiveness. We find that while the feedback scheme is
highly efficien... | 0501101v1 |
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