On Periods and $L$-functions for $\mathbf{GL}_4 \times \mathbf{GL}_2$

TL;DR

This paper introduces a new integral representation for specific L-functions on GL(4)×GL(2), linking their central values to periods and providing evidence for related conjectures.

Contribution

It develops a novel integral formula for the $igwedge^2 imes ext{std}_2$ L-function and connects its central value to periods, advancing understanding of these special values.

Findings

Established a relation between the central L-value and the generalized Shalika period.

Linked the L-function's central value to periods via theta correspondence.

Provided new evidence for Wan-Zhang and Gan-Gross-Prasad conjectures.

Abstract

We give a new integral representation of the $\wedge^2 \otimes \mathrm{std}_2$ $L$-function of generic cusp forms on $\mathbf{GL}_4 \times \mathbf{GL}_2$ and $\mathbf{GU}_{2,2}\times \mathbf{GL}_2$. In the former case, we use it to prove a relation between its central $L$-value and the generalized Shalika period. Exploiting the theta correspondence for $(\mathbf{GL}_4,\mathbf{GL}_4)$, we further establish a relation between the central value of the $L$-function attached to the strongly tempered spherical pair $(\mathbf{GL}_4 \times \mathbf{GL}_2,\mathbf{GL}_2 \times \mathbf{GL}_2)$ and its corresponding period. In the case of cusp forms on $\mathbf{GL}_4 \times \mathbf{GL}_2$ that are unramified everywhere, our formulas give new evidence towards conjectures of Wan-Zhang and of Gan-Gross-Prasad for $\mathbf{GSpin}_6 \times \mathbf{GSpin}_3$.