The Thick Part of the $\mathrm{PSL}_n(\mathbb{R})$-Hitchin-Riemann Moduli Space has Infinite Volume

Huiseong An; Heejae Kim; Mingook Kim; Seungjin Lee; Hongtaek Jung

The Thick Part of the $\mathrm{PSL}_n(\mathbb{R})$-Hitchin-Riemann Moduli Space has Infinite Volume

Geometric Topology 2026-07-07 v1

Authors: Huiseong An , Heejae Kim , Mingook Kim , Seungjin Lee , Hongtaek Jung

Abstract

We prove that the thick part of the $\mathrm{PSL}_n(\mathbb{R})$ -Hitchin-Riemann moduli space has infinite total Atiyah--Bott--Goldman volume for $n>2$ . This result stands in contrast to Mumford's compactness criterion. To achieve this result, we employ Goldman flows and internal sequences to find an infinite series of subsets of identical volume, the images of which in the Hitchin-Riemann moduli space are all mutually disjoint and sit in the thick part.

Keywords

Hitchin moduli space Atiyah-Bott-Goldman volume thick part Goldman flows PSL_n(R)

Cite

@article{arxiv.2607.06554,
  title  = {The Thick Part of the $\mathrm{PSL}_n(\mathbb{R})$-Hitchin-Riemann Moduli Space has Infinite Volume},
  author = {Huiseong An and Heejae Kim and Mingook Kim and Seungjin Lee and Hongtaek Jung},
  journal= {arXiv preprint arXiv:2607.06554},
  year   = {2026}
}

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8 pages