University of Toronto's Symplectic Geometry Seminar

January 8, 2007, 3:10pm
BA 2165

Tomoo Matsumura

Boston University

Lehn-Sorger algebra, Fantechi-Gottsche ring and a wreath product orbifold

Abstract: We will start with the definition of orbifold chomology of a global quotient by a finite group, using Fantechi-Gottsche ring. The ring multiplication is given by a very simple formula due to Jarvis-Kaufmann-Kimura. We will explain the case of symmetric product orbifolds and show how it generalizes to wreath product orbifolds.