A quantum Leray-Hirsch theorem for banded gerbes

preprint2020arXivOpen access

Abstract

For a gerbe $\Y$ over a smooth proper Deligne-Mumford stack $\B$ banded by a finite group GG, we prove a structure result on the Gromov-Witten theory of $\Y$, expressing Gromov-Witten invariants of $\Y$ in terms of Gromov-Witten invariants of $\B$ twisted by various flat U(1)U(1)-gerbes on $\B$. This is interpreted as a Leray-Hirsch type of result for Gromov-Witten theory of gerbes.

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