Equidistribution of expanding measures with local maximal dimension and Diophantine Approximation

Ronggang Shi

Published 2009-05-08, updated 2009-05-11Version 2

We consider improvements of Dirichlet's Theorem on space of matrices $M_{m,n}(R)$. It is shown that for a certain class of fractals $K\subset [0,1]^{mn}\subset M_{m,n}(R)$ of local maximal dimension Dirichlet's Theorem cannot be improved almost everywhere. This is shown using entropy and dynamics on homogeneous spaces of Lie groups.