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abstract: 'Let $F$ be a number field and $D$ a quaternion algebra over $F$. Take a cuspidal automorphic representation $\pi$ of $D_\A^\times$ with trivial central cahracter. We study the zeta functions with period integrals on $\pi$ for the perhomogeneous vector space $(D^\times\times D^\times\times\GL_2, D\oplus D)$. We show their meromorphic continuation and functional equation, determine the location and orders of possible poles and compute the residue. Arguing along the theory of Saito and computing unramified local factors, the explicit formula of the zeta functions is obtained. Counting the order of possible poles of this explicit formula, we show that if $L(1/2, \pi)\neq0$, there are infinitely many quadratic extension $E$ of $F$ which embeds in $D$, such that $\pi$ has nonvanishing toric period with respect to $E$.'
address:
- |
    Miyu Suzuki\
    Faculty of Mathematics and Physics, Institute of Science and Engineering\
    Kanazawa University\
    Kakumamachi, Kanazawa, Ishikawa, 920-1192, JAPAN
- |
    Satoshi Wakatsuki\
    Faculty of Mathematics and Physics, Institute of Science and Engineering\
    Kanazawa University\
    Kakumamachi, Kanazawa, Ishikawa, 920-1192, JAPAN
author:
- Miyu Suzuki and Satoshi Wakatsuki
title: 'Zeta functions and nonvanishing theorems for toric periods on $\GL_2$'
---

Introduction
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Background and Main result
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In a series of papers 