# American Institute of Mathematical Sciences

January  2000, 6(1): 147-154. doi: 10.3934/dcds.2000.6.147

## $\mathbb Z^d$-covers of horosphere foliations

 1 Department of Mathematics, University of Manchester, Oxford Road, Manchester M13 9PL

Received  October 1999 Published  December 1999

Let $M$ be the unit tangent bundle of a compact manifold with negative sectional curvatures and let $\hat M$ be a $\mathbb Z^d$ cover for $M$. Let $\mu$ be the measure of maximal entropy for the associated geodesic flow on $M$ and let $\hat\mu$ be the lift of $\mu$ to $\hat M$.
We show that the foliation $\hat{M^{s s}}$ is ergodic with respect to $\hat\mu$. (This was proved in the special case of surfaces by Babillot and Ledrappier by a different method.) Our method extends to certain Anosov and hyperbolic flows.
Citation: Mark Pollicott. $\mathbb Z^d$-covers of horosphere foliations. Discrete & Continuous Dynamical Systems - A, 2000, 6 (1) : 147-154. doi: 10.3934/dcds.2000.6.147
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