A short proof of Host's equidistribution theorem

Abstract

This note contains a new proof of Host's equidistribution theorem for multiplicatively independent endomorphisms of $\mathbb{R}/\mathbb{Z}$. The method is a simplified version of our upcoming work on equidistribution under toral automorphisms and is related to the argument in [HochmanShmerkin2015], but avoids the use of the scenery flow and of Marstrand's projection theorem, using instead a direct Fourier argument to establish smoothness of the limit measure.

10 pages, V2: Minor corrections, added missing phase in Eq (4.3) and later on

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