Non-typical points for $\beta$-shifts

Abstract

We study sets of nontypical points under the map $f_{\beta }\mapsto \beta x$ mod 1, for non-integer $\beta$ and extend our results from [Färm, Persson, Schmeling, 2010] in several directions. In particular we prove that sets of points whose forward orbit avoid certain Cantor sets, and set of points for which ergodic averages diverge, have large intersection properties. We observe that the technical condition $\beta >1.541$ found in [Färm, Persson, Schmeling, 2010] can be removed.

9 pages. The paper has been reorganised, and an important reference has been added in accordance to a kind suggestion of a referee