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Remarks on A-branes, Mirror Symmetry, and the Fukaya category

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arxiv hep-th/0109098 v1 pith:U4I6647U submitted 2001-09-12 hep-th math.AG

classification hep-thmath.AG
keywords a-branescategoryfukayacoisotropicmirrorstructuresymmetrya-brane
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We discuss D-branes of the topological A-model (A-branes), which are believed to be closely related to the Fukaya category. We give string theory arguments which show that A-branes are not necessarily Lagrangian submanifolds in the Calabi-Yau: more general coisotropic branes are also allowed, if the line bundle on the brane is not flat. We show that a coisotropic A-brane has a natural structure of a foliated manifold with a transverse holomorphic structure. We argue that the Fukaya category must be enlarged with such objects for the Homological Mirror Symmetry conjecture to be true.

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    In 5d N=1 U(N) gauge theory, codimension-two defects produce Q-operators whose q-difference equations are the Baxter TQ equations of XXZ spin chains built on bi-infinite evaluation modules of quantum affine algebras.

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