Comparing Hecke coefficients of automorphic representations

Chiriac, Liubomir; Jorza, Andrei

doi:10.1090/tran/7903

Comparing Hecke coefficients of automorphic representations
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by Liubomir Chiriac and Andrei Jorza PDF

Trans. Amer. Math. Soc. 372 (2019), 8871-8896 Request permission

Abstract:

We prove a number of unconditional statistical results of the Hecke coefficients for unitary cuspidal representations of $\text {GL}(2)$ over number fields. Using partial bounds on the size of the Hecke coefficients, instances of Langlands functoriality, and properties of Rankin–Selberg $L$-functions, we obtain bounds on the set of places where linear combinations of Hecke coefficients are negative. Under a mild functoriality assumption we extend these methods to $\text {GL}(n)$. As an application, we obtain a result related to a question of Serre about the occurrence of large Hecke eigenvalues of Maass forms. Furthermore, in the cases where the Ramanujan conjecture is satisfied, we obtain distributional results of the Hecke coefficients at places varying in certain congruence or Galois classes.

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