Semigroup actions on tori and stationary measures on projective spaces

Details Semigroup actions on tori and stationary measures on projective spaces Semigroup actions on tori and stationary measures on projective spaces

2004-11-24

arxiv.org/abs/math/0411553v1

Mathematics

Dynamical Systems

Scientific paper

Let $\Gamma$ be a sub-semigroup of $G=GL(d,\mathbb R),$ $d>1.$ We assume that the action of $\Gamma$ on $\R^d$ is strongly irreducible and that $\Gamma$ contains a proximal and expanding element. We describe contraction properties of the dynamics of $\Gamma$ on $\R^d$ at infinity. This amounts to the consideration of the action of $\Gamma$ on some compact homogeneous spaces of $G,$ which are extensions of the projective space $\pr^{d-1}.$ In the case where $\Gamma$ is a sub-semigroup of $GL(d,\R)\cap M(d,\Z)$ and $\Gamma$ has the above properties, we deduce that the $\Gamma$-orbits on $\T^d=\R^d\slash\Z^d$ are finite or dense.

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