Dan Petersen: Admissible covers, modular operads and modular forms
Time: Thu 2011-12-01 14.00
Location: Room 3721, Lindstedtsvägen 25, 7th floor, Department of Mathematics, KTH
Subject area: Algebraic geometry
Doctoral student: Dan Petersen
Opponent: Alessandro Chiodo, Institut Fourier, Université Grenoble
Supervisor: Carel Faber, KTH
This thesis contains three articles related to operads and moduli spaces of admissible covers of curves. In Paper A we isolate cohomology classes coming from modular forms inside a certain space of admissible covers, thereby showing that this moduli space can be used as a substitute for a Kuga–Sato variety. Paper B contains a combinatorial proof of Ezra Getzler’s semiclassical approximation for modular operads, and a proof of a formula needed in Paper A. In Paper C we explain in what sense spaces of admissible covers form a modular operad, by introducing the notion of an operad colored by a groupoid.