39 research outputs found
Noise effects in extended chaotic system: study on the Lorenz'96 model
We investigate the effects of a time-correlated noise on an extended chaotic
system. The chosen model is the Lorenz'96, a kind of toy model used for climate
studies. The system is subjected to both temporal and spatiotemporal
perturbations. Through the analysis of the system's time evolution and its time
correlations, we have obtained numerical evidence for two stochastic
resonance-like behaviors. Such behavior is seen when a generalized
signal-to-noise ratio function are depicted as a function of the external noise
intensity or as function of the system size. The underlying mechanism seems to
be associated to a noise-induced chaos reduction. The possible relevance of
those findings for an optimal climate prediction are discussed, using an
analysis of the noise effects on the evolution of finite perturbations and
errors.Comment: To appear in Statistical Mechanics Research Focus, Special volume
(Nova Science Pub., NY, in press) (LaTex, 16 pgs, 14 figures
Diffusion in Fluctuating Media: The Resonant Activation Problem
We present a one-dimensional model for diffusion in a fluctuating lattice;
that is a lattice which can be in two or more states. Transitions between the
lattice states are induced by a combination of two processes: one periodic
deterministic and the other stochastic. We study the dynamics of a system of
particles moving in that medium, and characterize the problem from different
points of view: mean first passage time (MFPT), probability of return to a
given site (), and the total length displacement or number of visited
lattice sites (). We observe a double {\it resonant activation}-like
phenomenon when we plot the MFPT and as functions of the intensity of
the transition rate stochastic component.Comment: RevTex, 15 pgs, 8 figures, submitted to Eur.Phys.J.
Bulk Mediated Surface Diffusion: The Infinite System Case
An analytical soluble model based on a Continuous Time Random Walk (CTRW)
scheme for the adsorption-desorption processes at interfaces, called
bulk-mediated surface diffusion, is presented. The time evolution of the
effective probability distribution width on the surface is calculated and
analyzed within an anomalous diffusion framework. The asymptotic behavior for
large times shows a sub-diffusive regime for the effective surface diffusion
but, depending on the observed range of time, other regimes may be obtained.
Montecarlo simulations show excellent agreement with analytical results. As an
important byproduct of the indicated approach, we present the evaluation of the
time for the first visit to the surface.Comment: 15 pages, 7 figure
Bulk Mediated Surface Diffusion: Finite System Case
We address the dynamics of adsorbed molecules (a fundamental issue in surface
physics) within the framework of a Master Equation scheme, and study the
diffusion of particles in a finite cubic lattice whose boundaries are at the
and the planes where , while the and
directions are unbounded. As we are interested in the effective diffusion
process at the interface , we calculate analytically the conditional
probability for finding the system on the plane as well as the surface
dispersion as a function of time and compare these results with Monte Carlo
simulations finding an excellent agreement.Comment: 19 pages, 8 figure
Invited review: KPZ. Recent developments via a variational formulation
Recently, a variational approach has been introduced for the paradigmatic
Kardar--Parisi--Zhang (KPZ) equation. Here we review that approach, together
with the functional Taylor expansion that the KPZ nonequilibrium potential
(NEP) admits. Such expansion becomes naturally truncated at third order, giving
rise to a nonlinear stochastic partial differential equation to be regarded as
a gradient-flow counterpart to the KPZ equation. A dynamic renormalization
group analysis at one-loop order of this new mesoscopic model yields the KPZ
scaling relation alpha+z=2, as a consequence of the exact cancelation of the
different contributions to vertex renormalization. This result is quite
remarkable, considering the lower degree of symmetry of this equation, which is
in particular not Galilean invariant. In addition, this scheme is exploited to
inquire about the dynamical behavior of the KPZ equation through a
path-integral approach. Each of these aspects offers novel points of view and
sheds light on particular aspects of the dynamics of the KPZ equation.Comment: 16 pages, 2 figure
The Use of Rank Histograms and MVL Diagrams to Characterize Ensemble Evolution in Weather Forecasting
13 páginas, 9 figuras.-- El pdf del artÃculo es la versión pre-print.Rank Histograms are suitable tools to assess the quality of ensembles within an ensemble prediction system or framework. By counting the rank of a given variable in the ensemble, we are basically making a sample analysis, which does not allow us to distinguish if the origin of its variability is external noise or comes from chaotic sources. The recently introduced Mean to Variance Logarithmic (MVL) Diagram accounts for the spatial variability, being very sensitive to the spatial localization produced by infinitesimal perturbations of spatiotemporal chaotic systems. By using as a benchmark a simple model subject to noise, we show the distinct information given by Rank Histograms and MVL Diagrams. Hence, the main effects of the external noise can be visualized in a graphic. From the MVL diagram we clearly observe a reduction of the amplitude growth rate and of the spatial localization (chaos suppression), while from the Rank Histogram we observe changes in the reliability of the ensemble. We conclude that in a complex framework including spatiotemporal chaos and noise, both provide a more complete forecasting picture.We acknowledge financial support
from MEC, Spain, through Grant No. CGL2007-
64387/CLI, and also thank the AECID, Spain, for support
through projects A/013666/07 and A/018685/08. JAR
thanks the MEC, Spain, for the award of a Juan de la
Cierva fellowship. HSW thanks to the European Commission
for the award of a Marie Curie Chair during part of
the development of this work.Peer reviewe
Effect of Non Gaussian Noises on the Stochastic Resonance-Like Phenomenon in Gated Traps
We exploit a simple one-dimensional trapping model introduced before,
prompted by the problem of ion current across a biological membrane. The
voltage-sensitive channels are open or closed depending on the value taken by
an external potential that has two contributions: a deterministic periodic and
a stochastic one. Here we assume that the noise source is colored and non
Gaussian, with a -dependent probability distribution (where is a
parameter indicating the departure from Gaussianity). We analyze the behavior
of the oscillation amplitude as a function of both and the noise
correlation time. The main result is that in addition to the resonant-like
maximum as a function of the noise intensity, there is a new resonant maximum
as a function of the parameter .Comment: Communication to LAWNP01, Proceedings to be published in Physica D,
RevTex, 8 pgs, 5 figure
Trapping Dynamics with Gated Traps: Stochastic Resonance-Like Phenomenon
We present a simple one-dimensional trapping model prompted by the problem of
ion current across biological membranes. The trap is modeled mimicking the
ionic channel membrane behaviour. Such voltage-sensitive channels are open or
closed depending on the value taken by a potential. Here we have assumed that
the external potential has two contributions: a determinist periodic and a
stochastic one. Our model shows a resonant-like maximum when we plot the
amplitude of the oscillations in the absorption current vs. noise intensity.
The model was solved both numerically and using an analytic approximation and
was found to be in good accord with numerical simulations.Comment: RevTex, 5 pgs, 3 figure
Resonant phenomena in extended chaotic systems subject to external noise: the Lorenz'96 model case
We investigate the effects of a time-correlated noise on an extended chaotic
system. The chosen model is the Lorenz'96, a kind of "toy" model used for
climate studies. Through the analysis of the system's time evolution and its
time and space correlations, we have obtained numerical evidence for two
stochastic resonance-like behavior. Such behavior is seen when both, the usual
and a generalized signal-to-noise ratio function are depicted as a function of
the external noise intensity or the system size. The underlying mechanism seems
to be associated to a "noise-induced chaos reduction". The possible relevance
of these and other findings for an "optimal" climate prediction are discussed.Comment: Submitted to Europhysics Letters (LaTex, 12 pgs, 5 figures