72 citations · 386 across the 30 of their papers we have counts for
5 papers · 1 filter
Isochronous bifurcations in a two-parameter twist map
Michele Mugnaine, Bruno B. Leal, Alfredo M. Ozorio de Almeida +2
Isochronous islands in phase space emerge in twist Hamiltonian systems as a response to multiple resonant perturbations. According to the Poincaré-Birkhoff theorem, the number of i…
Quantum Baker Maps for Spiraling Chaotic Motion
Pedro R. del Santoro, Raul O. Vallejos, Alfredo M. Ozorio de Almeida
We define a coupling of two baker maps through a pi/2 rotation both in position and in momentum. The classical trajectories thus exhibit spiraling, or loxodromic motion, which is o…
Periodic orbit bifurcations and scattering time delay fluctuations
J. P. Keating, A. M. Ozorio de Almeida, S. D. Prado +2
We study fluctuations of the Wigner time delay for open (scattering) systems which exhibit mixed dynamics in the classical limit. It is shown that in the semiclassical limit the ti…
Hyperbolic Scar Patterns in Phase Space
Alejandro M. F. Rivas, Alfredo M. Ozorio de Almeida
We develop a semiclassical approximation for the spectral Wigner and Husimi functions in the neighbourhood of a classically unstable periodic orbit of chaotic two dimensional maps.…
Scars of the Wigner function
Fabricio Toscano, Marcus A. M. de Aguiar, Alfredo M. Ozorio de Almeida
We propose a picture of Wigner function scars as a sequence of concentric rings along a two-dimensional surface inside a periodic orbit. This is verified for a two-dimensional plan…