Raul O Vallejos
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Explore the profile of Raul O Vallejos including associated specialties, affiliations and a list of published articles.
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12
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8
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Recent Articles
1.
Correia P, Carvalho G, de Oliveira T, Vallejos R, de Melo F
Phys Rev Lett
. 2024 Aug;
133(6):060401.
PMID: 39178447
With the control of increasingly complex quantum systems, the relevant degrees of freedom we are interested in may not be those traditionally addressed by statistical quantum mechanics. Here, we employ...
2.
Anteneodo C, Camargo S, Vallejos R
Phys Rev E
. 2018 Jan;
96(6-1):062209.
PMID: 29347349
We revisit the numerical calculation of generalized Lyapunov exponents, L(q), in deterministic dynamical systems. The standard method consists of adding noise to the dynamics in order to use importance sampling...
3.
Anteneodo C, Gonzalez-Avella J, Vallejos R
Phys Rev E
. 2017 Jul;
95(6-1):062213.
PMID: 28709265
We study the completely synchronized states (CSSs) of a system of coupled logistic maps as a function of three parameters: interaction strength (ɛ), range of the interaction (α), that can...
4.
Vallejos R, Anteneodo C
Phys Rev E Stat Nonlin Soft Matter Phys
. 2012 Apr;
85(2 Pt 1):021124.
PMID: 22463169
The cumulant expansion is used to estimate generalized Lyapunov exponents of the random-frequency harmonic oscillator. Three stochastic processes are considered: Gaussian white noise, Ornstein-Uhlenbeck, and Poisson shot noise. In some...
5.
Carlo G, Vallejos R, Abreu R
Phys Rev E Stat Nonlin Soft Matter Phys
. 2011 Jan;
82(4 Pt 2):046220.
PMID: 21230378
Because of a formal equivalence with the partition function of an Ising chain, the semiclassical traces of the quantum baker map can be calculated using the transfer-matrix method. We analyze...
6.
Toscano F, Vallejos R, Wisniacki D
Phys Rev E Stat Nonlin Soft Matter Phys
. 2009 Nov;
80(4 Pt 2):046218.
PMID: 19905426
We test the ability of semiclassical theory to describe quantitatively the revival of quantum wave packets-a long time phenomena-in the one dimensional quartic oscillator (a Kerr type Hamiltonian). Two semiclassical...
7.
Maia R, Nicacio F, Vallejos R, Toscano F
Phys Rev Lett
. 2008 Jun;
100(18):184102.
PMID: 18518376
We analyze the semiclassical evolution of Gaussian wave packets in chaotic systems. We show that after some short time a Gaussian wave packet becomes a primitive WKB state. From then...
8.
Lewenkopf C, Vallejos R
Phys Rev E Stat Nonlin Soft Matter Phys
. 2004 Nov;
70(3 Pt 2):036214.
PMID: 15524619
Using results from the theory of dynamical systems, we derive a general expression for the classical average scattering dwell time tau . Remarkably, tau depends only on a ratio of...
9.
Toscano F, Vallejos R, Tsallis C
Phys Rev E Stat Nonlin Soft Matter Phys
. 2004 Jul;
69(6 Pt 2):066131.
PMID: 15244691
The classical Gaussian ensembles of random matrices can be constructed by maximizing Boltzmann-Gibbs-Shannon's entropy, S(BGS) = -integral dH[P(H)]ln[P(H)], with suitable constraints. Here, we construct and analyze random-matrix ensembles arising from...
10.
Anteneodo C, Maia R, Vallejos R
Phys Rev E Stat Nonlin Soft Matter Phys
. 2003 Oct;
68(3 Pt 2):036120.
PMID: 14524845
The stochastic approach to the determination of the largest Lyapunov exponent of a many-particle system is tested in the so-called mean-field XY Hamiltonians. In weakly chaotic regimes, the stochastic approach...