##
Workshop on Quantum Cohomology of Stacks

Feb. 12 - 16, 2007

Schedule

All lectures will take place at the Amphithéâtre Hermite
(IHP, ground
floor).

All coffee
breaks will take place on the second floor of IHP.

### Mon, Feb. 12

9.00 Arrival

10.00 Coffee break

10.30 Angelo Vistoli, Essential
dimension and algebraic stacks

11.45 Tom Coates, Mirror symmetry and the
crepant resolution conjecture

15.00 Rebecca Goldin, Chen-Ruan cohomology
for abelian quotients of compact Lie groups

16.00 Coffee break

16.30 Tara Holm, Symplectic techniques for
computing the cohomology of orbifolds

### Tue, Feb. 13

9.00 Linda Chen, Enumerative
geometry and Gromov-Witten theory of stacks

10.00 Coffee break

10.30 Fabio Perroni, Chen-Ruan cohomology of
*ADE* singularities

11.45 Hsian-Hua Tseng, Twisted orbifold
Gromov-Witten invariants in genus zero

15.00 Hiroshi Iritani, Wall-crossing in
the quantum cohomology of toric orbifolds

16.00 Coffee break

16.30 Takashi Kimura, Stringy Algebraic Structures and Orbifolds

19.30 **Social dinner at restaurant Le pot de
terre**

### Wed, Feb. 14

15.00 Etienne Mann, Orbifold quantum
cohomology of weighted projective spaces

16.00 Coffee break

16.30 Yongbin Ruan, Quantum birational geometry

### Thu, Feb. 15

9.00 Dagan Karp,
Large *N* duality and orbifold quotients
of the resolved conifold

10.00 Coffee break

10.30 Alessio Corti,
Quantum orbifold cohomology of weak Fano
toric DM stacks

11.45 Weimin Chen, Pseudoholomorphic curves in the context of
orbifolds

15.00 Ralph Kaufmann, The global
orbifold approach to stringy geometry

16.00 Coffee break

16.30 Michael Rose, Arithmetic mirror symmetry and l-adic Chen-Ruan
cohomology

### Fri, Feb. 16

9.00 Megumi Harada, The *K*-theory of
symplectic quotients

10.00 Coffee break

10.30 Alessandro Chiodo, Mumford formula
generalized to *r*th roots: crepant and *r*-spin applications

Last updated Feb 6, 2007.