On the generation of the coefficient field of a newform by a single Hecke eigenvalue

Details On the generation of the coefficient field of a newform by a single Hecke eigenvalue On the generation of the coefficient field of a newform by a single Hecke eigenvalue

2007-11-21

arxiv.org/abs/0711.3405v2

Mathematics

Number Theory

13 pages, more complete result, some corollaries added

Scientific paper

Let f be a non-CM newform of weight k > 1. Let L be a subfield of the coefficient field of f. We completely settle the question of the density of the set of primes p such that the p-th coefficient of f generates the field L. This density is determined by the inner twists of f. As a particular case, we obtain that in the absence of non-trivial inner twists, the density is 1 for L equal to the whole coefficient field. We also present some new data on reducibility of Hecke polynomials, which suggest questions for further investigation.

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