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The Chow weight structure for geometric motives for quotient stacks

Dhyan Aranha and Chirantan Chowdhury

Vol. 11 (2026), No. 4, 555–592
Abstract

We construct the Chow weight structure on the derived category of geometric motives DM ⁡ gm ⁡ ([X∕G],Λ) for X a quasiprojective scheme over a field of characteristic 0, G an affine algebraic group, and Λ an arbitrary commutative ring. In particular, we also show that the heart of this weight structure recovers the category of Chow motives on [X∕G].

Keywords
weight structures, motives, quotient stacks
Mathematical Subject Classification
Primary: 14A30, 14C25, 18F20, 18N60
Milestones
Received: 3 May 2024
Revised: 27 March 2026
Accepted: 14 April 2026
Published: 21 October 2026
Authors
Dhyan Aranha
Laboratoire de Mathématiques J. A. Dieudonné
Université Côte d’Azur
NICE
France
Chirantan Chowdhury
Fachbereich Mathematik
Technische Universität Darmstadt
Darmstadt
Germany