Orbifold cohomology of abelian symplectic reductions and the case of weighted projective spaces

Details Orbifold cohomology of abelian symplectic reductions and the case of weighted projective spaces Orbifold cohomology of abelian symplectic reductions and the case of weighted projective spaces

2007-04-02

arxiv.org/abs/0704.0257v1

Mathematics

Symplectic Geometry

20 pages, 3 figures, 3 tables

Scientific paper

These notes accompany a lecture about the topology of symplectic (and other) quotients. The aim is two-fold: first to advertise the ease of computation in the symplectic category; and second to give an account of some new computations for weighted projective spaces. We start with a brief exposition of how orbifolds arise in the symplectic category, and discuss the techniques used to understand their topology. We then show how these results can be used to compute the Chen-Ruan orbifold cohomology ring of abelian symplectic reductions. We conclude by comparing the several rings associated to a weighted projective space. We make these computations directly, avoiding any mention of a stacky fan or of a labeled moment polytope.

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