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Finite descent obstruction for Hilbert modular varieties

Part of: Arithmetic algebraic geometry Discontinuous groups and automorphic forms Arithmetic problems. Diophantine geometry

Published online by Cambridge University Press:  22 July 2020

Gregorio Baldi  and
Giada Grossi
Gregorio Baldi
Affiliation:
Department of Mathematics, University College London, 25, Gordon St., London, UK, WC1H 0AY e-mail: gregorio.baldi.16@ucl.ac.uk
Giada Grossi*
Affiliation:
Department of Mathematics, University College London, 25, Gordon St., London, UK, WC1H 0AY e-mail: gregorio.baldi.16@ucl.ac.uk
*
e-mail: giada.grossi.16@ucl.ac.uk
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Abstract

Let S be a finite set of primes. We prove that a form of finite Galois descent obstruction is the only obstruction to the existence of $\mathbb {Z}_{S}$ -points on integral models of Hilbert modular varieties, extending a result of D. Helm and F. Voloch about modular curves. Let L be a totally real field. Under (a special case of) the absolute Hodge conjecture and a weak Serre’s conjecture for mod $\ell $ representations of the absolute Galois group of L, we prove that the same holds also for the $\mathcal {O}_{L,S}$ -points.

Keywords

Hilbert modular varietiesdescent obstructionGalois representationsSerre’s conjectureAbelian varieties of GL2-typetotally real fields

MSC classification

Primary: 11F41: Automorphic forms on $(2)$; Hilbert and Hilbert-Siegel modular groups and their modular and automorphic forms; Hilbert modular surfaces 11G35: Varieties over global fields 14G35: Modular and Shimura varieties 11F80: Galois representations
Type
Article
Information
Canadian Mathematical Bulletin , Volume 64 , Issue 2 , June 2021 , pp. 452 - 473
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Copyright
© Canadian Mathematical Society 2020

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Footnotes

This work was supported by the Engineering and Physical Sciences Research Council [EP/ L015234/1], the EPSRC Centre for Doctoral Training in Geometry and Number Theory (The London School of Geometry and Number Theory), and University College London.

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