Robustly transitive maps of ${\mathbb{T}}^n$ with large dimensional central spaces

Abstract

Given any triplet of positive integers $n\ge 2$, $m$ and $k$ such that $n=m+k$, we exhibit a $C^1$ robustly transitive endomorphism of ${\mathbb{T}}^n$ with persistent critical points in the isotopy class of $F\times Id$, where $F$ is an expanding map of ${\mathbb{T}}^m$ and $Id$ is the identity of ${\mathbb{T}}^k$. Furthermore, if $k$ is small, the map is not only in the isotopy class but in fact a perturbation of $F\times Id$.

This is a construction from march 2023 that was not uploaded before. It is a relaxation of the hypothesis of the result at arXiv:2008.00911 Version 3 improves largely on the proofs and eliminates passages that could be dimmed as self plagiarism