Background
Basic concepts
equivalences in/of -categories
Universal constructions
Local presentation
Theorems
Extra stuff, structure, properties
Models
The Fukaya category of a symplectic manifold is an A-∞ category having Lagrangian submanifolds of as objects. When two Lagrangian submanifolds and of meet transversally, their hom-space in the Fukaya category can be roughly defined as the free vector space generated by the intersection points ; one of the main difficulties in giving a rigorous definition of the Fukaya category in general relies precisely in the problem of correctly defining the hom-spaces for nontransversal intersections. As one could expect, the same difficulty carries on to the definition of the multilinear operations in the Fukaya category: when Lagrangians intersect transversally one has a clear geometric intuition of the multiplication
in terms of counting pseudo-holomorphic disks into whose boundaries lie on the given Lagrangian submanifolds, but when intersections are nontransverse, the definition of becomes more evasive.
In string theory, the Fukaya category of a symplectic manifold represents the category of D-branes in the A-model – the A-branes – with target space . For Landau-Ginzburg models, the category of A-branes is described by Fukaya-Seidel categories.
The assignment that sends a symplectic manifold to its Fukaya category extends to a functor on a variant of the symplectic category with Lagrangian correspondences as morphisms. This is supposed to be the FQFT incarnation of Donaldson theory. See at Lagrangian correspondences and category-valued TFT for more on this and see at homological mirror symmetry.
In intersecting D-brane models Yukawa couplings are encoded by worldsheet instantons of open strings stretching between the intersecting D-branes (see Marchesano 03, Section 7.5). Mathematically this is encoded by derived hom-spaces in a Fukaya category (see Marchesano 03, Section 7.5).
table grabbed from Marchesano 03
Fukaya categories have first been introduced in
-category, and Floer homologies_. Proceedings of GARC Workshop on Geometry and Topology ‘93 (Seoul, 1993). (link)
The definitive reference is the book
See also
A beginners introduction is given by Denis Auroux, see link, a text (available as ArXiv 1301.7056), based on a series of lectures given at a Summer School on Contact and Symplectic Topology at Université de Nantes in June 2011.
Discussion of the relation to Lagrangian cobordism is in
Relation to Yukawa couplings in intersecting D-brane models:
Last revised on February 6, 2019 at 09:00:57. See the history of this page for a list of all contributions to it.