Mathematics – Dynamical Systems
Scientific paper
2007-05-29
J. Stat. Phys. Vol. 139. No. 3 (2010), 355-366
Mathematics
Dynamical Systems
17 pages, 2 figures
Scientific paper
10.1007/s10955-010-9927-6
The Local Ergodic Theorem (also known as the `Fundamental Theorem') gives sufficient conditions under which a phase point has an open neighborhood that belongs (mod 0) to one ergodic component. This theorem is a key ingredient of many proofs of ergodicity for billiards and, more generally, for smooth hyperbolic maps with singularities. However the proof of that theorem relies upon a delicate assumption (Chernov-Sinai Ansatz), which is difficult to check for some physically relevant models, including gases of hard balls. Here we give a proof of the Local Ergodic Theorem for two dimensional billiards without using the Ansatz.
Chernov Nikolay
Simanyi Nandor
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