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Waldspurger formula over function fields

Research paper by Chih-Yun Chuang, Fu-Tsun Wei

Indexed on: 08 Nov '16Published on: 08 Nov '16Published in: arXiv - Mathematics - Number Theory



Abstract

In this paper, we derive a function field version of the Waldspurger formula for the central critical values of the Rankin-Selberg L-functions. This formula states that the central critical L-values in question can be expressed as the "ratio" of the global toric period integral to the product of the local toric period integrals. Consequently, this result provides a necessary and sufficient criterion for the non-vanishing of these central critical L-values, and supports the Gross-Prasad conjecture for $SO(3)$ over function fields.