The boundary motive: definition and basic properties
Algebraic Geometry
2007-05-23 v3 K-Theory and Homology
Abstract
We introduce the notion of the boundary motive of a scheme X over a perfect field. By definition, it measures the difference between the motive X and the motive with compact support of X. We develop three tools to compute the boundary motive in terms of the geometry of a compactification of X: co-localization, invariance under abstract blow-up, and analytical invariance. We then prove auto-duality of the boundary motive of a smooth scheme X. As a formal consequence of this, and of co-localization, we obtain a fourth computational tool, namely localization for the boundary motive.
Keywords
Cite
@article{arxiv.math/0408295,
title = {The boundary motive: definition and basic properties},
author = {J. Wildeshaus},
journal= {arXiv preprint arXiv:math/0408295},
year = {2007}
}
Comments
33 pages; accepted for publication in Comp. Math. Following the request of the referee, a section on the case of normal crossings was added