A Quantum Kirwan Map, I: Fredholm Theory

Details A Quantum Kirwan Map, I: Fredholm Theory A Quantum Kirwan Map, I: Fredholm Theory

2009-05-25

arxiv.org/abs/0905.4047v1

Mathematics

Symplectic Geometry

39 pages

Scientific paper

Consider a Hamiltonian action of a compact connected Lie group $G$ on an aspherical symplectic manifold $(M,\omega)$. Under some assumptions on $(M,\omega)$ and the action, D. A. Salamon conjectured that counting gauge equivalence classes of symplectic vortices on the plane $R^2$ gives rise to a quantum deformation $Q\kappa_G$ of the Kirwan map. This article is the first of three, whose goal is to define $Q\kappa_G$ rigorously. Its main result is that the vertical differential of the vortex equations over $R^2$ (at the level of gauge equivalence) is a Fredholm operator of a specified index. Potentially, the map $Q\kappa_G$ can be used to compute the quantum cohomology of many symplectic quotients. Conjecturally it also gives rise to quantum generalizations of non-abelian localization and abelianization (see [Woodward-Ziltener]).

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