On the Hecke fields of Galois representations

Dohoon Choi, Yuichiro Taguchi

Research output: Contribution to journalArticlepeer-review


It is known that, in many cases, the field (known as the Hecke field) generated by all Hecke eigenvalues of an elliptic modular newform f is in fact generated by the pth Hecke eigenvalue ap of f for a single prime number p. In this paper, we study the density of such primes in a more general situation in terms of Galois representations. This is applied to the study of the fields of rationality of certain automorphic representations.

Original languageEnglish
Pages (from-to)813-821
Number of pages9
JournalBulletin of the London Mathematical Society
Issue number5
Publication statusPublished - 2016 Oct 1
Externally publishedYes

Bibliographical note

Funding Information:
The first author was partially supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (ASARC, NRF-2007-0056093). The second author was partially supported by JSPS KAKENHI 25400016.

Publisher Copyright:
© 2016 London Mathematical Society.

ASJC Scopus subject areas

  • General Mathematics


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