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Topological Methods in Nonlinear Analysis

Expanding maps and non-trivial selfcovers on infra-nilmanifolds
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  3. Vol 47, No 1 (March 2016) /
  4. Articles

Expanding maps and non-trivial selfcovers on infra-nilmanifolds

Authors

  • Karel Dekimpe
  • Jonas Deré

Keywords

Infra-nilmanifolds, expanding maps, nilpotent groups, graded Lie algebras

Abstract

Every expanding map on a closed manifold is topologically conjugate to an expanding map on an infra-nilmanifold, but not every infra-nilmanifold admits an expanding map. In this article we give a complete algebraic characterization of the infra-nilmanifolds admitting an expanding map. We show that, just as in the case of Anosov diffeomorphisms, the existence of an expanding map depends only on the rational holonomy representation of the infra-nilmanifold. A similar characterization is also given for the infra-nilmanifolds with a non-trivial self-cover, which corresponds to determining which almost-Bieberbach groups are co-Hopfian. These results provide many new examples of infra-nilmanifolds without non-trivial self-covers or expanding maps.

References

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A. Manning, There are no new Anosov diffeomorphisms on tori, Amer. J. Math. 96 (1974), 422-429.

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Published

2016-03-01

How to Cite

1.
DEKIMPE, Karel and DERÉ, Jonas. Expanding maps and non-trivial selfcovers on infra-nilmanifolds. Topological Methods in Nonlinear Analysis. Online. 1 March 2016. Vol. 47, no. 1, pp. 347 - 368. [Accessed 1 July 2025].
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Vol 47, No 1 (March 2016)

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