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On Siegel Zeros of Symmetric Power L-functions (2301.07869v2)

Published 19 Jan 2023 in math.NT

Abstract: Let $f$ be a holomorphic cusp form of even weight $k$ for the modular group $SL(2,\mathbb{Z})$, which is assumed to be a common eigenfunction for all Hecke operators. For positive integer $n$, let $\text{Sym}n(f)$ be the symmetric nth power lifting of $f$ , which was shown by Newton and Thorne to be automorphic and cuspidal. In this paper, we construct certain auxiliary $L$-functions to show that Siegel zeros of $\text{Sym}n(f)$ do not exist, for each given $n$, utilizing the above functoriality result. As an application, we give a lower bound of those symmetric power $L$-functions at $s=1$ of logarithm power type.

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