Derived Fundamental Groups for Tate Motives

Details Derived Fundamental Groups for Tate Motives Derived Fundamental Groups for Tate Motives

2010-05-15

arxiv.org/abs/1005.2670v2

Mathematics

Algebraic Geometry

32 pages, corrected mistake (Lemma 6.10 was incorrect), generalized main statement

Scientific paper

We construct derived fundamental group schemes for Tate motives over connected smooth schemes over fields. We show that there exists a pro affine derived group scheme over the rationals such that its category of perfect representations models the triangulated category of rational mixed Tate motives. Under a hypothesis which is weaker than an integral version of the Beilinson-Soule vanishing conjecture we show that there is an affine derived group scheme over the integers such that its perfect representations model Tate motives with integral coefficients. The hypothesis is for example fulfilled for number fields. This generalizes previous non-derived constructions of fundamental group schemes for Tate motives with rational coefficients.

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