On the operad structure of admissible G-covers

Abstract

We describe the modular operad structure on the moduli spaces of pointed stable curves equipped with an admissible $G$-cover. To do this we are forced to introduce the notion of an operad colored not by a set but by the objects of a category. This construction interpolates in a sense between `framed' and `colored' versions of operads; we hope that it will be of independent interest. An algebra over this operad is the same thing as a $G$-equivariant CohFT, as defined by Jarvis, Kaufmann and Kimura. We prove that the (orbifold) Gromov--Witten invariants of global quotients $[X/G]$ give examples of $G$-CohFTs.

22 pages

References in corpus (2)

• Pointed Admissible G-Covers and G-equivariant Cohomological Field Theories
• The Drinfel'd Double and Twisting in Stringy Orbifold Theory

Cited by in corpus (5)

• A tale of three homotopies
• Modular operads and the nerve theorem
• Deformation theory of Cohomological Field Theories
• Stable homology of Lie algebras of derivations and homotopy invariants of wheeled operads
• Reconnectads