Vol. 4, No. 4, 2019

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On the intersection motive of certain Shimura varieties: the case of Siegel threefolds

Jörg Wildeshaus

Vol. 4 (2019), No. 4, 525–559

We construct a Hecke-equivariant Chow motive whose realizations equal intersection cohomology of Siegel threefolds with regular algebraic coefficients. As a consequence, we are able to define Grothendieck motives for Siegel modular forms.

Siegel threefolds, weight structures, intersection motive, motives for Siegel modular forms
Mathematical Subject Classification 2010
Primary: 14G35
Secondary: 11F32, 11F46, 14C25, 14F20, 14F25
Received: 5 October 2017
Revised: 22 March 2019
Accepted: 16 April 2019
Published: 10 January 2020
Jörg Wildeshaus
Laboratoire Analyse, Géométrie et Applications
Université Paris 13, Sorbonne Paris Cité