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On a filtration of $\mathit{CH}_{0}$ for an abelian variety

Part of: Cycles and subschemes

Published online by Cambridge University Press:  22 December 2014

Evangelia Gazaki
Evangelia Gazaki*
Affiliation:
Department of Mathematics, University of Chicago, 5734 University Avenue, Chicago, IL 60637, USA email [email protected]
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Abstract

Let $A$ be an abelian variety defined over a field $k$. In this paper we define a descending filtration $\{F^{r}\}_{r\geqslant 0}$ of the group $\mathit{CH}_{0}(A)$ and prove that the successive quotients $F^{r}/F^{r+1}\otimes \mathbb{Z}[1/r!]$ are isomorphic to the group $(K(k;A,\dots ,A)/Sym)\otimes \mathbb{Z}[1/r!]$, where $K(k;A,\dots ,A)$ is the Somekawa $K$-group attached to $r$-copies of the abelian variety $A$. In the special case when $k$ is a finite extension of $\mathbb{Q}_{p}$ and $A$ has split multiplicative reduction, we compute the kernel of the map $\mathit{CH}_{0}(A)\otimes \mathbb{Z}[\frac{1}{2}]\rightarrow \text{Hom}(Br(A),\mathbb{Q}/\mathbb{Z})\otimes \mathbb{Z}[\frac{1}{2}]$, induced by the pairing $\mathit{CH}_{0}(A)\times Br(A)\rightarrow \mathbb{Q}/\mathbb{Z}$.

Keywords

zero cyclesabelian varietiesSomekawa K-groupBrauer group

MSC classification

Primary: 14C25: Algebraic cycles
Type
Research Article
Information
Compositio Mathematica , Volume 151 , Issue 3 , March 2015 , pp. 435 - 460
Copyright
© The Author 2014 

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