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On the Structure of Symplectic Mappings. The Fast Lyapunov Indicator: a Very Sensitive Tool
Authors:Claude Froeschlé  Elena Lega
Affiliation:(1) Bv. de l"rsquo"Observatoire, Observatoire de Nice, B.P. 4229, 06304 Nice cedex 4, France
Abstract:It is already known (Froeschlé, Lega and Gonczi, 1997) that the Fast Lyapunov Indicator (FLI), that is the computation on a relatively short time of the largest Lyapunov indicator, allows to discriminate between ordered and weak chaotic motion. We have found that, under certain conditions, the FLI also discriminates between resonant and non-resonant orbits, not only for two-dimensional symplectic mappings but also for higher dimensional ones. Using this indicator, we present an example of the Arnold web detection for four and six-dimensional symplectic maps. We show that this method allows to detect the global transition of the system from an exponentially stable Nekhoroshevrsquos like regime to the diffusive Chirikovrsquos one.
Keywords:chaos  numerical tools  Nekhoroshev  Chirikov
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