First cohomology of Anosov actions of higher rank abelian groups and applications to rigidity |
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Authors: | Anatole Katok Ralf J Spatzier |
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Institution: | (1) Department of Mathematics, The Pennsylvania State University, 16802 State College, PA;(2) Department of Mathematics, University of Michigan, 48109 Ann Arbor, MI |
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Abstract: | This is the first in a series of papers exploring rigidity properties of hyperbolic actions ofZ k orR k fork ≥ 2. We show that for all known irreducible examples, the cohomology of smooth cocycles over these actions is trivial. We also obtain similar Hölder and C1 results via a generalization of the Livshitz theorem for Anosov flows. As a consequence, there are only trivial smooth or Hölder time changes for these actions (up to an automorphism). Furthermore, small perturbations of these actions are Hölder conjugate and preserve a smooth volume. |
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