Twisted second moments of Dirichlet $L$-functions with applications to weighted one-level density

Abstract

We give an asymptotic formula for the twisted second moment of a fixed Dirichlet $L$-function in the $t$-aspect. This is a generalization of Selberg's asymptotic formula for the twisted second moment of the Riemann zeta function. As an application, we observe the change and the stability of the weighted one-level density of zeros of a fixed Dirichlet $L$-function.