On special values of standard L-functions of Siegel cusp eigenforms of genus 3

Anh Tuan Do (1) , Kirill Vankov (1)

1 IF - Institut Fourier

We explicitly compute the special values of the standard $L$-function $L(s, F_{12}, \mathrm{St})$ at the critical points $s\in \lbrace -8, -6, -4, -2, 0, 1, 3, 5, 7, 9\rbrace $, where $F_{12}$ is the unique (up to a scalar) Siegel cusp form of degree $3$ and weight $12$, which was constructed by Miyawaki. These values are proportional to the product of the Petersson norms of symmetric square of Ramanujan’s $\Delta $ and the cusp form of weight $20$ for ${\rm SL}_2(\mathbb{Z})$ by a rational number and some power of $\pi $. We use the Rankin-Selberg method and apply the Holomorphic projection to compute these values. To our knowledge this is the first example of a standard $L$-function of Siegel cusp form of degree $3$, when the special values can be computed explicitly.

Mots clés: special values of L-functions; Siegel modular forms; Rankin-Selberg method

Domaines: Théorie des nombres [math.NT]

Anh Tuan Do, Kirill Vankov. On special values of standard L-functions of Siegel cusp eigenforms of genus 3. Journal de Théorie des Nombres de Bordeaux, 2015, 27 (3), pp.727 - 744. ⟨10.5802/jtnb.921⟩. ⟨hal-01571121⟩