Pointwise normality and Fourier decay for self-conformal measures
Abstract
Let be a smooth IFS on , where . We provide mild conditions on the derivative cocycle that ensure that every self conformal measure is supported on points that are absolutely normal. That is, for integer the sequence equidistributes modulo . We thus extend several state of the art results of Hochman and Shmerkin about the prevalence of normal numbers in fractals. When is self-similar we show that the set of absolutely normal numbers has full Hausdorff dimension in its attractor, unless has an explicit structure that is associated with some integer . These conditions on the derivative cocycle are also shown to imply that every self conformal measure is a Rajchman measure, that is, its Fourier transform decays to at infinity. When is self similar and satisfies a certain Diophantine condition, we establish a logarithmic rate of decay.
Cite
@article{arxiv.2012.06529,
title = {Pointwise normality and Fourier decay for self-conformal measures},
author = {Amir Algom and Federico Rodriguez Hertz and Zhiren Wang},
journal= {arXiv preprint arXiv:2012.06529},
year = {2021}
}
Comments
V3: Revised according to comments made by the referee and P\'{e}ter Varj\'{u}. To appear in Adv. Math