A note on p-harmonic measure

Abstract

Let $1 < p < \infty$. We identify the optimal decay exponent of the $p$-harmonic measure $ω_p ( B( ξ, t) \cap \partial \mathbb{B}, 0, \mathbb{B}) $ for small $t$, where $\mathbb{B}$ is the unit ball in $\mathbb{R}^n$, $ξ\in \partial \mathbb{B}$ and $B(ξ, t)$ denotes the euclidean ball centered at $ξ$ of radius $t$. As a consequence and, under suitable geometrical restrictions on a domain $Ω\subset \mathbb{R}^n $, we identify the optimal decay exponent of $ω_p ( B( ξ, t) \cap \partial Ω, a, Ω)$ for small $t$, where $a \in Ω$ and $ξ\in \partial Ω$. When restricted to the range $1 < p < n$ we provide new estimates complementing previous results of different authors in the unit ball, the unit disc or the upper half-space.