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Random ordering in modulus of consecutive Hecke eigenvalues of primitive forms

Part of: Discontinuous groups and automorphic forms Multiplicative number theory

Published online by Cambridge University Press:  18 October 2018

Yuri F. Bilu ,
Jean-Marc Deshouillers ,
Sanoli Gun  and
Florian Luca
Yuri F. Bilu
Affiliation:
Université de Bordeaux and CNRS, Institut de Mathématiques de Bordeaux UMR 5251, 33405 Talence, France email yuri@math.u-bordeaux.fr
Jean-Marc Deshouillers
Affiliation:
Université de Bordeaux, CNRS and Bordeaux INP, Institut de Mathématiques de Bordeaux UMR 5251, F-33405 Talence, France email jean-marc.deshouillers@math.u-bordeaux.fr
Sanoli Gun
Affiliation:
Institute of Mathematical Sciences, HBNI, C.I.T. Campus, Taramani, Chennai 600 113, India email sanoli@imsc.res.in
Florian Luca
Affiliation:
School of Mathematics, University of the Witwatersrand, Private Bag X3, Wits 2050, South Africa Department of Mathematics, Faculty of Sciences, University of Ostrava, 30. dubna 22, 701 03 Ostrava 1, Czech Republic email florian.luca@wits.ac.za
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Abstract

Let $\unicode[STIX]{x1D70F}(\cdot )$ be the classical Ramanujan $\unicode[STIX]{x1D70F}$-function and let $k$ be a positive integer such that $\unicode[STIX]{x1D70F}(n)\neq 0$ for $1\leqslant n\leqslant k/2$. (This is known to be true for $k<10^{23}$, and, conjecturally, for all $k$.) Further, let $\unicode[STIX]{x1D70E}$ be a permutation of the set $\{1,\ldots ,k\}$. We show that there exist infinitely many positive integers $m$ such that $|\unicode[STIX]{x1D70F}(m+\unicode[STIX]{x1D70E}(1))|<|\unicode[STIX]{x1D70F}(m+\unicode[STIX]{x1D70E}(2))|<\cdots <|\unicode[STIX]{x1D70F}(m+\unicode[STIX]{x1D70E}(k))|$. We also obtain a similar result for Hecke eigenvalues of primitive forms of square-free level.

Keywords

Fourier coefficients of modular formssieveSato–Tate

MSC classification

Primary: 11F30: Fourier coefficients of automorphic forms
Secondary: 11F11: Holomorphic modular forms of integral weight 11N36: Applications of sieve methods
Type
Research Article
Information
Compositio Mathematica , Volume 154 , Issue 11 , November 2018 , pp. 2441 - 2461
Copyright
© The Authors 2018 

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