Microlocal Morse theory of wrapped Fukaya categories

Sheel Ganatra*, John Pardon, Vivek Shende

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The Nadler–Zaslow correspondence famously identifies the finite-dimensional Floer homology groups between Lagrangians in cotangent bundles with the finite-dimensional Hom spaces between corresponding constructible sheaves. We generalize this correspondence to incorporate the infinite-dimensional spaces of morphisms “at infinity,” given on the Floer side by Reeb trajectories (also known as “wrapping”) and on the sheaf side by allowing unbounded infinite rank sheaves which are categorically compact. When combined with existing sheaf theoretic computations, our results confirm many new instances of homological mirror symmetry. More precisely, given a real analytic manifold M and a subanalytic isotropic subset Λ of its co-sphere bundle S*M, we show that the partially wrapped Fukaya category of T*M stopped at Λ is equivalent to the category of compact objects in the unbounded derived category of sheaves on M with microsupport inside Λ. By an embedding trick, we also deduce a sheaf theoretic description of the wrapped Fukaya category of any Weinstein sector admitting a stable polarization.

Original languageEnglish
JournalAnnals of Mathematics
Volume199
Issue number3
Pages (from-to)943-1042
Number of pages100
ISSN0003-486X
DOIs
Publication statusPublished - May 2024

Keywords

  • Fukaya category
  • microlocal sheaf
  • mirror symmetry
  • Stein manifold
  • Weinstein manifold

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