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PreprintCC BY 4.0arXiv

Strong stable sets and asymptotic fineness

  • Sergi Burniol Clotet
  • Françoise Dal'Bo
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Abstract

We investigate the strong stable sets of the geodesic flow on hyperbolic surfaces and their relation to the injectivity radius. We prove that the strong stable set of a vector does not coincide with its stable horocycle if and only if the injectivity radius along the associated geodesic ray is not bounded away from zero and the ray does not diverge through a cusp. In that case, the strong stable set is an uncountable union of stable horocycles. In previous works, we considered the particular cases where the ray meets arbitrarily short closed geodesics or closed horocycles. Here we complete the study by treating the third possible case, where the ray meets closed hypercycles of arbitrarily small length.

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Cite

BibTeXRIS
BibTeX
@misc{clotet2026strong,
  title = {{Strong stable sets and asymptotic fineness}},
  author = {Sergi Burniol Clotet and Françoise Dal'Bo},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.38099},
  eprint = {2610.38099},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.38099},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Strong stable sets and asymptotic fineness
AU  - Sergi Burniol Clotet
AU  - Françoise Dal'Bo
PY  - 2026
DA  - 2026/10/28
PB  - arXiv
DO  - 10.48550/arxiv.2610.38099
UR  - https://arxiv.org/abs/2610.38099
AB  - We investigate the strong stable sets of the geodesic flow on hyperbolic surfaces and their relation to the injectivity radius. We prove that the strong stable set of a vector does not coincide with its stable horocycle if and only if the injectivity radius along the associated geodesic ray is not bounded away from zero and the ray does not diverge through a cusp. In that case, the strong stable set is an uncountable union of stable horocycles. In previous works, we considered the particular cases where the ray meets arbitrarily short closed geodesics or closed horocycles. Here we complete the study by treating the third possible case, where the ray meets closed hypercycles of arbitrarily small length.
ER  -