Patterson-Sullivan measures of Anosov groups are Hausdorff measures

S Dey, DM Kim, H Oh - arXiv preprint arXiv:2401.12398, 2024 - arxiv.org
arXiv preprint arXiv:2401.12398, 2024arxiv.org
In the theory of Kleinian groups, Sullivan's classical theorem establishes the
correspondence between Patterson-Sullivan measures and Hausdorff measures on the limit
sets for convex cocompact Kleinian groups. This connection provides a geometric
understanding of Patterson-Sullivan measures, emphasizing their association with the
internal metric on limit sets. Recent advancements in the theory of infinite covolume discrete
subgroups of higher rank Lie groups have brought Anosov subgroups into focus as a natural …
In the theory of Kleinian groups, Sullivan's classical theorem establishes the correspondence between Patterson-Sullivan measures and Hausdorff measures on the limit sets for convex cocompact Kleinian groups. This connection provides a geometric understanding of Patterson-Sullivan measures, emphasizing their association with the internal metric on limit sets. Recent advancements in the theory of infinite covolume discrete subgroups of higher rank Lie groups have brought Anosov subgroups into focus as a natural higher rank extension of convex cocompact Kleinian groups. This raises an intriguing question: under what conditions do Patterson-Sullivan measures of Anosov subgroups emerge as Hausdorff measures on limit sets with appropriate metrics? In this paper, we give a definitive answer to this question by showing that, for all Zariski dense Anosov subgroups, a Patterson-Sullivan measure is proportional to the one-dimensional Hausdorff measure for an intrinsic conformal premetric if and only if it is symmetric. Furthermore, in the symmetric case, the Patterson-Sullivan measure of any ball is comparable to its radius. We also discuss several applications, including analyticity of -Hausdorff dimensions on the Teichm\"uller spaces and spectral properties of associated locally symmetric manifolds such as temperedness and the bottom of the -spectrum.
arxiv.org