An estimate for the Steklov zeta function of a planar domain derived from a first variation formula

Abstract

We consider the Steklov zeta function $ζ$ $Ω$ of a smooth bounded simply connected planar domain $Ω$ $\subset$ R 2 of perimeter 2$π$. We provide a first variation formula for $ζ$ $Ω$ under a smooth deformation of the domain. On the base of the formula, we prove that, for every s $\in$ (--1, 0) $\cup$ (0, 1), the difference $ζ$ $Ω$ (s) -- 2$ζ$ R (s) is non-negative and is equal to zero if and only if $Ω$ is a round disk ($ζ$ R is the classical Riemann zeta function). Our approach gives also an alternative proof of the inequality $ζ$ $Ω$ (s) -- 2$ζ$ R (s) $\ge$ 0 for s $\in$ (--$\infty$, --1] $\cup$ (1, $\infty$); the latter fact was proved in our previous paper [2018] in a different way. We also provide an alternative proof of the equality $ζ$ $Ω$ (0) = 2$ζ$ R (0) obtained by Edward and Wu [1991].