English

On $C^0$-stability of compact leaves with amenable fundamental group

Geometric Topology 2024-02-15 v2 Dynamical Systems

Abstract

In his work on the generalization of the Reeb stability theorem, Thurston conjectured that if the fundamental group of a compact leaf LL in a codimension-one transversely orientable foliation is amenable and if the first cohomology group H1(L;R)H^1(L;\mathbb{R}) is trivial, then LL has a neighborhood foliated as a product. This was later proved as a consequence of Witte-Morris' theorem on the local indicability of amenable left orderable groups and Navas' theorem on the left orderability of the group of germs of orientation-preserving homeomorphisms of the real line at the origin. In this note, we prove that Thurston's conjecture also holds for any foliation that is sufficiently close to the original foliation. Hence, if the fundamental group π1(L)\pi_1(L) is amenable and H1(L;R)=0H^1(L;\mathbb{R})=0, then for every transversely orientable codimension-one foliation F\mathcal{F} having LL as a leaf, there is a neighborhood of F\mathcal{F} in the space of C1,0C^{1,0} foliations with Epstein C0C^0 topology consisting entirely of foliations that are locally a product L×RL \times \mathbb{R}.

Keywords

Cite

@article{arxiv.2303.07443,
  title  = {On $C^0$-stability of compact leaves with amenable fundamental group},
  author = {Sam Nariman and Mehdi Yazdi},
  journal= {arXiv preprint arXiv:2303.07443},
  year   = {2024}
}

Comments

16 pages, comments are welcome. v2: this version to appear in MRL