Equivariant motivic integration on formal schemes and the motivic zeta function

Abstract

For a formal scheme over a complete discrete valuation ring with a good action of a finite group, we define equivariant motivic integration, and we prove a change of variable formula for that.To do so, we construct and examine an induced group action on the Greenberg scheme of such a formal scheme. Using this equivariant motivic integration, we define an equivariant volume Poincar\'e series, from which we deduce Denef and Loeser's motivic zeta function including the action of the profinite group of roots of unity.