Singular symplectic flops and Ruan cohomology

Details Singular symplectic flops and Ruan cohomology Singular symplectic flops and Ruan cohomology

2008-04-19

arxiv.org/abs/0804.3144v1

Mathematics

Symplectic Geometry

34pages

Scientific paper

In this paper, we study the symplectic geometry of singular conifolds of the finite group quotient $$ W_r=\{(x,y,z,t)|xy-z^{2r}+t^2=0 \}/\mu_r(a,-a,1,0), r\geq 1, $$ which we call orbi-conifolds. The related orbifold symplectic conifold transition and orbifold symplectic flops are constructed. Let $X$ and $Y$ be two symplectic orbifolds connected by such a flop. We study orbifold Gromov-Witten invariants of exceptional classes on $X$ and $Y$ and show that they have isomorphic Ruan cohomologies. Hence, we verify a conjecture of Ruan.

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