On the motive of a commutative algebraic group
Stephen Enright-Ward
Mathematisches Institut, Albert-Ludwigs-Universität Freiburg, Eckerstraße 1, 79104 Freiburg im Breisgau, GermanyGiuseppe Ancona
Universität Duisburg-Essen, Thea-Leymann-Straße 9, 45127 Essen, GermanyAnnette Huber
Mathematisches Institut, Albert-Ludwigs-Universität Freiburg, Eckerstraße 1, 79104 Freiburg im Breisgau, Germany

Abstract
We prove a canonical Künneth decomposition for the motive of a commutative group scheme over a field. Moreover, we show that this decomposition behaves under the group law just as in cohomology. We also deduce applications of the decomposition to the existence of a weight filtration, computation of any Weil cohomology theory and study of 1-motives.
Cite this article
Stephen Enright-Ward, Giuseppe Ancona, Annette Huber, On the motive of a commutative algebraic group. Doc. Math. 20 (2015), pp. 807–858
DOI 10.4171/DM/506