A Poisson–Jensen Type Representation Formula for Subharmonic Functions on Stratified Lie Groups

Author: Bonfiglioli Andrea   Cinti Chiara  

Publisher: Springer Publishing Company

ISSN: 0926-2601

Source: Potential Analysis, Vol.22, Iss.2, 2005-03, pp. : 151-169

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Abstract

The aim of this paper is to prove a representation formula of Poisson–Jensen type on bounded domains Ω for subharmonic functions related to sub-Laplacians ∆G on stratified Lie groups G. Our result gives a complete answer to a question arisen in Math. Ann. 325 (2003), 97–122, where the additional hypothesis that Ω is regular for the Dirichlet problem related to ∆G was made: here we treat the case of arbitrary bounded domains Ω, omitting the hypothesis of regularity. In order to prove our representation formula, an ad-hoc theory of polar sets and capacity with respect to ∆G is also provided.