A Profinite Group Invariant for Hyperbolic Toral Automorphisms

Details A Profinite Group Invariant for Hyperbolic Toral Automorphisms A Profinite Group Invariant for Hyperbolic Toral Automorphisms

2011-02-04

arxiv.org/abs/1102.0839v1

Mathematics

Dynamical Systems

17 pages

Scientific paper

For a hyperbolic toral automorphism, we construct a profinite completion of an isomorphic copy of the homoclinic group of its right action using isomorphic copies of the periodic data of its left action. The resulting profinite group has a natural module structure over a ring determined by the right action of the hyperbolic toral automorphism. This module is an invariant of conjugacy that provides means in which to characterize when two similar hyperbolic toral automorphisms are conjugate or not. In particular, this shows for two similar hyperbolic toral automorphisms with module isomorphic left action periodic data, that the homoclinic groups of their right actions play the key role in determining whether or not they are conjugate. This gives a complete set of dynamically significant invariants for the topological classification of hyperbolic toral automorphisms.

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