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arXiv · 1907.06113

Quasi-polynomials and the singular $[Q,R]=0$ theorem

Yiannis Loizides
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Abstract

In this short note we revisit the `shift-desingularization' version of the $[Q,R]=0$ theorem for possibly singular symplectic quotients. We take as starting point an elegant proof due to Szenes-Vergne of the quasi-polynomial behavior of the multiplicity as a function of the tensor power of the prequantum line bundle. We use the Berline-Vergne index formula and the stationary phase expansion to compute the quasi-polynomial, adapting an early approach of Meinrenken.

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Yiannis Loizides. 2019-07-13. Quasi-polynomials and the singular $[Q,R]=0$ theorem. https://doi.org/10.3842/sigma.2019.090

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