Bessel Potentials, Hitting Distributions and Green Functions

Details Bessel Potentials, Hitting Distributions and Green Functions Bessel Potentials, Hitting Distributions and Green Functions

2006-12-07

arxiv.org/abs/math/0612176v1

Mathematics

Probability

Scientific paper

The purpose of this paper is to find explicit formulas for basic objects pertaining the local potential theory of the operator $(I-\Delta)^{\alpha/2}$, $0<\alpha<2$. The potential theory of this operator is based on Bessel potentials $J_{\alpha}=(I-\Delta)^{-\alpha/2}$. We compute the {\it harmonic measure} of the half-space and write a concise form of the corresponding {\it Green function} for the operator $(I-\Delta)^{\alpha/2}$. To achieve this we analyze the so-called {\it relativistic $\alpha$-stable process} on $\R^d$ space, killed when exiting the half-space. In terms of this process we are dealing here with the 1-{\it potential theory} or, equivalently, potential theory of Schr{\"o}dinger operator based on the generator of the process with Kato's potential $q=-1$.

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