# Large values of $L$-functions on $1$-line

## TL;DR

This paper establishes lower bounds for a broad class of $L$-functions on the 1-line, showing they can attain arbitrarily large values, generalizing previous results for the Riemann zeta-function.

## Contribution

It extends known lower bound results for the Riemann zeta-function to a wider family of $L$-functions, including Dedekind zeta and Rankin-Selberg $L$-functions.

## Key findings

- Existence of arbitrarily large values of $L$-functions on the 1-line.
- Generalization of previous bounds for the Riemann zeta-function.
- Lower bounds applicable to Dedekind zeta and Rankin-Selberg $L$-functions.

## Abstract

In this paper, we study lower bounds of a general family of $L$-functions on the $1$-line. More precisely, we show that for any $F(s)$ in this family, there exists arbitrary large $t$ such that $F(1+it)\geq e^{\gamma_F} (\log_2 t + \log_3 t)^m + O(1)$, where $m$ is the order of the pole of $F(s)$ at $s=1$. This is a generalization of the same result of Aistleitner, Munsch and the second author for the Riemann zeta-function. As a consequence, we get lower bounds for large values of Dedekind zeta-functions and Rankin-Selberg $L$-functions of the type $L(s,f\times f)$ on the $1$-line.