English

Relating categorical dimensions in topology and symplectic geometry

Symplectic Geometry 2025-10-17 v2 Algebraic Topology Category Theory

Abstract

We study several notions of dimension for (pre-)triangulated categories naturally arising from topology and symplectic geometry. We prove new bounds on these dimensions and raise several questions for further investigation. For instance, we relate the Rouquier dimension of the wrapped Fukaya category of either the cotangent bundle of a smooth manifold MM or more generally a Weinstein domain XX to quantities of geometric interest. These quantities include the minimum number of critical values of a Morse function on MM, the Lusternik-Schnirelmann category of MM, the number of distinct action values of a Hamiltonian diffeomorphism of XX, and the smallest nn such that XX admits a Weinstein embedding into R2n+1\mathbb{R}^{2n+1}. Along the way, we introduce a notion of the Lusternik-Schnirelmann category for dg-categories and construct exact Lagrangian cobordisms for restriction to a Liouville subdomain.

Keywords

Cite

@article{arxiv.2308.13677,
  title  = {Relating categorical dimensions in topology and symplectic geometry},
  author = {Andrew Hanlon and Jeff Hicks and Oleg Lazarev},
  journal= {arXiv preprint arXiv:2308.13677},
  year   = {2025}
}

Comments

42 Pages, 2 figures. Corrected typos, improved exposition, and modified to section 4 following referee report