A Large Sieve Inequality of Elliott–Montgomery–Vaughan Type for Automorphic Forms and Two Applications
1 Department of Mathematics, The University of Hong Kong, Pokfulam Road, Hong Kong
2 Institut Elie Cartan Nancy (IECN), Nancy-Université, CNRS, INRIA, Boulevard des Aiguillettes, B.P. 239, 54506, Vandœuvre-lès-Nancy, France
3 School of Mathematical Sciences, Shandong, Normal University, Jinan, Shandong 250014, China
Correspondence: Correspondence to be sent to: yklau{at}maths.hku.hk
In this paper, we establish a large sieve inequality of Elliott–Montgomery–Vaughan type for Fourier coefficients of newforms. As applications, we give a significant improvement on the principal result of Duke and Kowalski on Linnik's problem for modular forms and prove the upper part of the first conjecture of Montgomery–Vaughan in the context of automorphic L-functions.