Communications in Number Theory and Physics
Volume 1 (2007)
Frobenius action on ℓ-adic Chen–Ruan cohomology
Pages: 513 – 537
We extend the definition of the Chen–Ruan cohomology ring to smooth, proper, tame, Deligne–Mumford stacks over fields of positive characteristic and prove that a modified version of the Frobenius action preserves the product.