Positivity of quadratic base change $L$-functions

Real zeros of quadratic Dirichlet L - functions

A small part of the Generalized Riemann Hypothesis asserts that L-functions do not have zeros on the line segment ( 2 , 1]. The question of vanishing at s = 2 often has deep arithmetical significance, and has been investigated extensively. A persuasive view is that L-functions vanish at 2 either for trivial reasons (the sign of the functional equation being negative), or for deep arithmetical r...

Distinguished Representations and Quadratic Base Change for Gl(3)

Let E/F be a quadratic extension of number fields. Suppose that every real place of F splits in E and let H be the unitary group in 3 variables. Suppose that Π is an automorphic cuspidal representation of GL(3, EA). We prove that there is a form φ in the space of Π such that the integral of φ over H(F )\H(FA) is non zero. Our proof is based on earlier results and the notion, discussed in this p...

The Second Moment of Quadratic Twists of Modular L-functions

The family of quadratic twists of a modular form has received much attention in recent years. Motivated by the Birch-Swinnerton-Dyer conjectures, we seek an understanding of the central values of the associated L-functions, and while this question has been investigated extensively, much remains unknown. One important theme in this area concerns the moments of these central L-values. Thanks to t...

Non-vanishing of Quadratic Twists of Modular L-functions

The First Moment of Quadratic Dirichlet L-functions

We obtain an asymptotic formula for the smoothly weighted first moment of primitive quadratic Dirichlet L-functions at the central point, with an error term that is “square-root” of the main term. Our approach uses a recursive technique that feeds the result back into itself, successively improving the error term.