title: Fukaya categories of the torus and Dehn surgery.
abstract: This paper is a companion to the authors' forthcoming work extending Heegaard Floer theory from closed 3-manifolds to compact 3-manifolds with two boundary components via quilted Floer cohomology. We describe the first interesting case of this theory: the invariants of 3-manifolds bounding S(2) [symbol: see text] T(2), regarded as modules over the Fukaya category of the punctured 2-torus. We extract a short proof of exactness of the Dehn surgery triangle in Heegaard Floer homology. We show that A(∞)-structures on the graded algebra A formed by the cohomology of two basic objects in the Fukaya category of the punctured 2-torus are governed by just two parameters (m(6), m(8)), extracted from the Hochschild cohomology of A. For the Fukaya category itself, m(6) ≠ 0.
authors.affiliation: University of Cambridge, Centre for Mathematical Sciences, Department of Pure Mathematics and Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WB, United Kingdom.
authors.forename: Yanki
authors.initials: Y
authors.lastname: Lekili
authors.forename: Timothy
authors.initials: T
authors.lastname: Perutz