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Diffeomorphism group valued cocycles over higher-rank abelian Anosov actions

Published online by Cambridge University Press:  05 April 2018

DANIJELA DAMJANOVIĆ
Affiliation:
Department of Mathematics, Kungliga Tekniska Högskolan, Lindstedtsvägen 25, SE-100 44 Stockholm, Sweden email [email protected], [email protected]
DISHENG XU
Affiliation:
Department of Mathematics, Kungliga Tekniska Högskolan, Lindstedtsvägen 25, SE-100 44 Stockholm, Sweden email [email protected], [email protected]

Abstract

We prove that every smooth diffeomorphism group valued cocycle over certain $\mathbb{Z}^{k}$ Anosov actions on tori (and more generally on infranilmanifolds) is a smooth coboundary on a finite cover, if the cocycle is center bunched and trivial at a fixed point. For smooth cocycles which are not trivial at a fixed point, we have smooth reduction of cocycles to constant ones, when lifted to the universal cover. These results on cocycle trivialization apply, via the existing global rigidity results, to maximal Cartan $\mathbb{Z}^{k}$ ($k\geq 3$) actions by Anosov diffeomorphisms (with at least one transitive), on any compact smooth manifold. This is the first rigidity result for cocycles over $\mathbb{Z}^{k}$ actions with values in diffeomorphism groups which does not require any restrictions on the smallness of the cocycle or on the diffeomorphism group.

Type
Original Article
Copyright
© Cambridge University Press, 2018 

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