Fourier Spectral Reciprocity and Canonical Hecke $L$-Functions

Abstract

We prove a Fourier-type toric spectral reciprocity formula over number fields, relating Tate integrals over a quadratic extension to a dual family of Hecke periods over the base field. The formula keeps the spectral parameter free and allows test functions adapted to arithmetic applications. We apply this reciprocity formula to canonical Hecke $L$-functions over CM fields and obtain explicit first moment formulas, including both central values and central derivatives. These formulas are uniform in the weight and the twisting conductor, and require no Heegner-type splitting hypothesis. Together with subconvexity bounds, they yield quantitative nonvanishing results for canonical Hecke $L$-functions and their derivatives. In weight one, this gives a rank-one analogue of the arithmetic applications of Masri--Yang, yielding quantitative Mordell--Weil rank-one results for quadratic twists of the associated CM abelian varieties.