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Partially hyperbolic endomorphisms with expanding linear part

Published online by Cambridge University Press:  28 May 2024

MARTIN ANDERSSON*
Affiliation:
Instituto de Matemática Aplicada, Universidade Federal Fluminense, Rua Professor Marcos Waldemar de Freitas Reis, S/N, 24210-201 Niterói, Brazil
WAGNER RANTER
Affiliation:
Instituto de Matemática, Universidade Federal de Alagoas, Campus A.C. Simoes S/N, 57072-090 Maceió, Alagoas, Brazil (e-mail: [email protected])

Abstract

In this paper, we study transitivity of partially hyperbolic endomorphisms of the two torus whose action in the first homology group has two integer eigenvalues of moduli greater than one. We prove that if the Jacobian is everywhere greater than the modulus of the largest eigenvalue, then the map is robustly transitive. For this, we introduce Blichfedt’s theorem as a tool for extracting dynamical information from the action of a map in homology. We also treat the case of specially partially hyperbolic endomorphisms, for which we obtain a complete dichotomy: either the map is transitive and conjugated to its linear part, or its unstable foliation must contain an annulus which may either be wandering or periodic.

Type
Original Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press

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