Deceleration mechanism of Fermi acceleration in a time-dependent stadium billiard

Details Deceleration mechanism of Fermi acceleration in a time-dependent stadium billiard Deceleration mechanism of Fermi acceleration in a time-dependent stadium billiard

2011-02-21

arxiv.org/abs/1102.4303v1

Nonlinear Sciences

Chaotic Dynamics

4 pages, 7 figures

Scientific paper

The dynamics of a time-dependent stadium-like billiard are studied by a four dimensional nonlinear mapping. We have shown that even without any dissipation, the particle experiences a decrease on its velocity. Such condition is related with a critical resonance velocity, where if the initial velocity has a higher value than the resonant one, we can observe Fermi acceleration, however, if the initial velocity has a initial value smaller than the critical one, the particle is temporarily trapped surrounding the stability islands, in a stickiness regime. We believe that this sticky orbits can act as deceleration mechanism for Fermi Acceleration.

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