Additive Chow groups with higher modulus and the generalized de Rham-Witt complex

摘要

Bloch and Esnault defined additive higher Chow groups with modulus (m+1) onthe level of zero cycles over a field k, denoted by TH^n(k,n;m), n,m >0. Theyprove that TH^n(k,n;1) is isomorphic to the group of absolute Kaehlerdifferentials of degree n-1 over k. In this paper we generalize their resultand show that TH^n(k,n;m) is isomorphic to W_m\Omega^{n-1}_k, the group ofdegree n-1 elements in the generalized de Rham-Witt of length m over k. Thiscomplex was defined by Hesselholt and Madsen and generalizes the p-typical deRham-Witt complex of Bloch-Deligne-Illusie. Before we can prove this theorem wehave to generalize some classical results to the de Rham-Witt complex. We givea construction of the generalized de Rham-Witt complex for\bbmath{Z}_(p)-algebras analogous to the construction in the p-typical case. Weconstruct a trace for finite field extensions L / k and if K is the functionfield of a smooth projective curve C over k and P in C is a point we define aresidue map Res_P: W_m\Omega^1_K --> W_m(k), which satisfies a"sum-of-residues-equal-zero" theorem.