Abstract |
When confronted with a smooth dynamical system that appears to possess
some sort of non-uniform hyperbolicity, it is useful to find an
invariant measure that controls the asymptotic properties of points
chosen at random with respect to the natural volume on the phase
space. Such SRB measures have been constructed for systems where it is
possible to relate the dynamics to a symbolic system via a Markov
partition or Young tower, and also for certain systems with a
dominated splitting. We present a new approach that does not require
any Markov structure or uniform geometric structure. The key is a
notion of "effective hyperbolicity", which can be used to
prove a non-uniform version of the Hadamard-Perron theorem on stable
and unstable manifolds. This is joint work with Dmitry Dolgopyat and
Yakov Pesin.
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