Abstract |
The Hopf argument has been employed for (almost) all proofs of ergodicity
of systems with some hyperbolicity. It has been noticed for quite a while
that this argument only works for smooth measure preserving systems. A new
approach has been introduced to study the metric properties of dissipative
dynamical systems. In particular, we prove the following dichotomy for some
partially hyperbolic systems: (1) Either there is no ACIP, or there exists
some smooth invariant measure; (2) Either the system is completely
dissipative, or it is ergodic.
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