English

On the absolute continuity of radial and linear projections of missing digits measures

Metric Geometry 2023-09-06 v1 Number Theory

Abstract

In this paper, we study the absolute continuity of radial projections of missing digits measures. We show that for large enough missing digits measures λ\lambda on Rn,n2,\mathbb{R}^n,n\geq 2, for all xRnsupp(λ),x\in\mathbb{R}^n\setminus \mathrm{supp}(\lambda), Πx(λ)\Pi_x(\lambda) is absolutely continuous with a density function in L2(Sn1).L^2(S^{n-1}). Our method applies to linear projections as well. In particular, we show that for λ\lambda as above, the linearly projected measure Pθ(λ)P_\theta(\lambda) is absolutely continuous with a continuous density function for almost all directions θSn1.\theta\in S^{n-1}. This implies a version of Palis' conjecture for missing digits sets.

Keywords

Cite

@article{arxiv.2309.01298,
  title  = {On the absolute continuity of radial and linear projections of missing digits measures},
  author = {Han Yu},
  journal= {arXiv preprint arXiv:2309.01298},
  year   = {2023}
}