Integrals of equivariant forms over non-compact symplectic manifolds

Details Integrals of equivariant forms over non-compact symplectic manifolds Integrals of equivariant forms over non-compact symplectic manifolds

2004-11-29

arxiv.org/abs/math/0411638v5

Mathematics

Symplectic Geometry

20 pages, to appear in JSG, final version

Scientific paper

This article is a result of the AIM workshop on Moment Maps and Surjectivity in Various Geometries (August 9 - 13, 2004) organized by T.Holm, E.Lerman and S.Tolman. At that workshop I was introduced to the work of T.Hausel and N.Proudfoot on hyperkahler quotients [HP]. One interesting feature of their article is that they consider integrals of equivariant forms over non-compact symplectic manifolds which do not converge, so they formally {\em define} these integrals as sums over the zeroes of vector fields, as in the Berline-Vergne localization formula. In this article we introduce a geometric-analytic regularization technique which makes such integrals converge and utilizes the symplectic structure of the manifold. We also prove that the Berline-Vergne localization formula holds for these integrals as well. The key step here is to redefine the collection of integrals \int_M alpha(X), X \in g, as a distribution on the Lie algebra g. We expect our regularization technique to generalize to non-compact group actions extending the results of [L1,L2].

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