Upgrading the Theorem on Local Ergodicity

Details Upgrading the Theorem on Local Ergodicity Upgrading the Theorem on Local Ergodicity

2003-02-10

arxiv.org/abs/math/0302108v2

Mathematics

Dynamical Systems

The paper is withdrawn due to an error

Scientific paper

We prove here that in the Theorem on Local Ergodicity for Semi-Dispersive Billiards (proved by N. I. Chernov and Ya. G. Sinai in 1987) the condition of the so called ``Ansatz'' can be dropped. That condition assumed that almost every singular phase point had a hyperbolic trajectory after the singularity. Having this condition dropped, the cited theorem becomes much stronger and easier to apply. At the end of the paper two immediate corollaries of this improvement are discussed: One of them is the (fully hyperbolic) Bernoulli mixing property of every hard disk system (D=2), the other one claims that the ergodic components of every hard ball system ($D\ge3$) are open.

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