Factorization of periods, construction of automorphic motives and Deligne's conjecture over CM-fields

Fuente: arXiv
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Main Authors: Grobner, Harald, Harris, Michael, Jie, Lin
Format: Preprint
Published: 2025
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author Grobner, Harald
Harris, Michael
Jie, Lin
author_facet Grobner, Harald
Harris, Michael
Jie, Lin
contents The present paper is devoted to the relations between Deligne's conjecture on critical values of motivic $L$-functions and the multiplicative relations between periods of arithmetically normalized automorphic forms on unitary groups. As an application of our main result, we establish Deligne's conjecture for a class of CM-automorphic motives, which we construct in this paper. Our proof uses the results of our recent joint work with Raghuram in combination with the Ichino--Ikeda--Neal-Harris (IINH) formula for unitary groups -- which is now a theorem -- and an analysis of cup products of coherent cohomological automorphic forms on Shimura varieties to establish relations between certain automorphic periods and critical values of Rankin-Selberg and Asai $L$-functions of $\GL(n)\times\GL(m)$ over CM fields. By reinterpreting these critical values in terms of automorphic periods of holomorphic automorphic forms on unitary groups, we show that the automorphic periods of holomorphic forms can be factored as products of coherent cohomological forms, compatibly with a motivic factorization predicted by the Tate conjecture. All of these results are stated under a certain regularity condition and an hypothesis of rationality on archimedean zeta-integrals.
format Preprint
id arxiv_https___arxiv_org_abs_2509_02303
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Factorization of periods, construction of automorphic motives and Deligne's conjecture over CM-fields
Grobner, Harald
Harris, Michael
Jie, Lin
Number Theory
Representation Theory
11F67 (primary), 11F70, 11G18, 11R39, 22E55
The present paper is devoted to the relations between Deligne's conjecture on critical values of motivic $L$-functions and the multiplicative relations between periods of arithmetically normalized automorphic forms on unitary groups. As an application of our main result, we establish Deligne's conjecture for a class of CM-automorphic motives, which we construct in this paper. Our proof uses the results of our recent joint work with Raghuram in combination with the Ichino--Ikeda--Neal-Harris (IINH) formula for unitary groups -- which is now a theorem -- and an analysis of cup products of coherent cohomological automorphic forms on Shimura varieties to establish relations between certain automorphic periods and critical values of Rankin-Selberg and Asai $L$-functions of $\GL(n)\times\GL(m)$ over CM fields. By reinterpreting these critical values in terms of automorphic periods of holomorphic automorphic forms on unitary groups, we show that the automorphic periods of holomorphic forms can be factored as products of coherent cohomological forms, compatibly with a motivic factorization predicted by the Tate conjecture. All of these results are stated under a certain regularity condition and an hypothesis of rationality on archimedean zeta-integrals.
title Factorization of periods, construction of automorphic motives and Deligne's conjecture over CM-fields
topic Number Theory
Representation Theory
11F67 (primary), 11F70, 11G18, 11R39, 22E55
url https://arxiv.org/abs/2509.02303