Dynamics of some piecewise smooth Fermi-Ulam Models

Details Dynamics of some piecewise smooth Fermi-Ulam Models Dynamics of some piecewise smooth Fermi-Ulam Models

2011-12-11

arxiv.org/abs/1112.2400v1

Mathematics

Dynamical Systems

22 pages, 4 figures

Scientific paper

We find a normal form which describes the high energy dynamics of a class of piecewise smooth Fermi-Ulam ping pong models; depending on the value of a single real parameter, the dynamics can be either hyperbolic or elliptic. In the first case we prove that the set of orbits undergoing Fermi acceleration has zero measure but full Hausdorff dimension. We also show that for almost every orbit the energy eventually falls below a fixed threshold. In the second case we prove that, generically, we have stable periodic orbits for arbitrarily high energies, and that the set of Fermi accelerating orbits may have infinite measure.

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