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ADJOINT FUNCTORS ON THE DERIVED CATEGORYOF MOTIVES

Part of: (Co)homology theory Cycles and subschemes Abelian categories

Published online by Cambridge University Press:  22 March 2016

Burt Totaro
Burt Totaro*
Affiliation:
UCLA Mathematics Department, Box 951555, Los Angeles, CA 90095-1555, USA (totaro@math.ucla.edu)
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Abstract

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We show that the subcategory of mixed Tate motives in Voevodsky’s derived category of motives is not closed under infinite products. In fact, the infinite product $\prod _{n=1}^{\infty }\mathbf{Q}(0)$ is not mixed Tate. More generally, the inclusions of several subcategories of motives do not have left or right adjoints. The proofs use the failure of finite generation for Chow groups in various contexts. In the positive direction, we show that for any scheme of finite type over a field whose motive is mixed Tate, the Chow groups are finitely generated.

Keywords

derived category of motivesChow groupmotivic cohomologymixed Tate motiveadjoint functor

MSC classification

Primary: 14F42: Motivic cohomology; motivic homotopy theory 14C15: (Equivariant) Chow groups and rings; motives 18E30: Derived categories, triangulated categories

Information

Type
Research Article
Information
Journal of the Institute of Mathematics of Jussieu , Volume 17 , Issue 3 , June 2018 , pp. 489 - 507
Copyright
© Cambridge University Press 2016 

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