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Extensions with shrinking fibers

Published online by Cambridge University Press:  24 April 2020

BENOÎT R. KLOECKNER*
Affiliation:
LAMA, Univ. Paris-Est Créteil, Univ. Gustave Eiffel, UPEM, CNRS, F-94010, Créteil, France email benoit.kloeckner@u-pec.fr
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Abstract

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We consider dynamical systems $T:X\rightarrow X$ that are extensions of a factor $S:Y\rightarrow Y$ through a projection $\unicode[STIX]{x1D70B}:X\rightarrow Y$ with shrinking fibers, that is, such that $T$ is uniformly continuous along fibers $\unicode[STIX]{x1D70B}^{-1}(y)$ and the diameter of iterate images of fibers $T^{n}(\unicode[STIX]{x1D70B}^{-1}(y))$ uniformly go to zero as $n\rightarrow \infty$ . We prove that every $S$ -invariant measure $\check{\unicode[STIX]{x1D707}}$ has a unique $T$ -invariant lift  $\unicode[STIX]{x1D707}$ , and prove that many properties of $\check{\unicode[STIX]{x1D707}}$ lift to  $\unicode[STIX]{x1D707}$ : ergodicity, weak and strong mixing, decay of correlations and statistical properties (possibly with weakening in the rates). The basic tool is a variation of the Wasserstein distance, obtained by constraining the optimal transportation paradigm to displacements along the fibers. We extend classical arguments to a general setting, enabling us to translate potentials and observables back and forth between $X$ and  $Y$ .

Information

Type
Original Article
Copyright
© The Author(s) 2020. Published by Cambridge University Press