Simple zeros of primitive Dirichlet $L$-functions and the asymptotic large sieve

Vorrapan Chandee, Yoonbok Lee, Sheng-chi Liu, Maksym Radziwiłł

Published 2012-11-28, updated 2013-02-14Version 2

Assuming the Generalized Riemann Hypothesis (GRH), we show using the asymptotic large sieve that 91% of the zeros of primitive Dirichlet $L$-functions are simple. This improves on earlier work of \"{O}zl\"{u}k which gives a proportion of at most 86%. We further compute an $q$-analogue of the Pair Correlation Function $F(\alpha)$ averaged over all primitive Dirichlet $L$-functions in the range $|\alpha| < 2$ . Previously such a result was available only when the average included all the characters $\chi$.