Coupled symplectic maps as models for subdiffusive processes in disordered Hamiltonian lattices

Chris G. Antonopoulos, Tassos Bountis, Lambros Drossos

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate dynamically and statistically diffusive motion in a chain of linearly coupled 2-dimensional symplectic McMillan maps and find evidence of subdiffusion in weakly and strongly chaotic regimes when all maps of the chain possess a saddle point at the origin and the central map is initially excited. In the case of weak coupling, there is either absence of diffusion or subdiffusion with q>1-Gaussian probability distributions, characterizing weak chaos. However, for large enough coupling and already moderate number of maps, the system exhibits strongly chaotic (q≈1) subdiffusive behavior, reminiscent of the subdiffusive energy spreading observed in a disordered Klein–Gordon Hamiltonian. Our results provide evidence that coupled symplectic maps can exhibit physical properties similar to those of disordered Hamiltonian systems, even though the local dynamics in the two cases is significantly different.

Original languageEnglish
Pages (from-to)110-119
Number of pages10
JournalApplied Numerical Mathematics
Volume104
DOIs
Publication statusPublished - Jun 1 2016

Keywords

  • Chaotic and diffusive motion
  • Complex statistics
  • Klein–Gordon disordered Hamiltonian
  • McMillan map
  • Multi-dimensional maps
  • Tsallis entropy
  • q-Gaussians

ASJC Scopus subject areas

  • Numerical Analysis
  • Computational Mathematics
  • Applied Mathematics

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