Symplectic Surgery and the Spinc–Dirac Operator

LetGbe a compact connected Lie group, and (M, ω) a compact HamiltonianG-space, with moment mapJ:M→g'. Under the assumption that these data are pre-quantizable, one can construct an associated Spinc–Dirac operator[formula], whose equivariant index yields a virtual representation ofG. We prove a...

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Published in:Advances in mathematics (New York. 1965) 1998-03, Vol.134 (2), p.240-277
Main Author: Meinrenken, Eckhard
Format: Article
Language:English
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Summary:LetGbe a compact connected Lie group, and (M, ω) a compact HamiltonianG-space, with moment mapJ:M→g'. Under the assumption that these data are pre-quantizable, one can construct an associated Spinc–Dirac operator[formula], whose equivariant index yields a virtual representation ofG. We prove a conjecture of Guillemin and Sternberg that if 0 is a regular value ofJ, the multiplicityN(0) of the trivial representation in the index space[formula], is equal to the index of the Spinc–Dirac operator for the symplectic quotientM0=J−1(0)/G. This generalizes previous results for the case thatG=Tis abelian, i.e., a torus.
ISSN:0001-8708
1090-2082
DOI:10.1006/aima.1997.1701