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Stable and unstable periodic orbits in the one dimensional lattice $ϕ^4$ theory

Periodic orbits for the classical $ϕ^4$ theory on the one dimensional lattice are systematically constructed by extending the normal modes of the harmonic theory, for periodic, fixed and free boundary conditions. Through the process, we clarify, in general, which normal modes of the linear theory can or can not be extended to the full non-linear theory. We then analyze the stability of these orbits, clarifying the link between the stability, parametric resonance and the Lyapunov spectra for these orbits.The construction of the periodic orbits and the stability analysis is applicable to theories governed by Hamiltonians with quadratic inter-site potentials and a general on-site potential. We also apply the analysis to theories with on-site potentials that have qualitatively different behavior from the $ϕ^4$ theory, with some concrete examples.

preprint2016arXivOpen access
Kenichiro Aoki
nlin.CD
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Kenichiro Aoki

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