Gibbs states over the cone of discrete measures

Abstract

Hagedorn D, Kondratiev Y, Pasurek T, Röckner M. Gibbs states over the cone of discrete measures. Journal Of Functional Analysis. 2013;264(11):2550-2583.We construct Gibbs perturbations of the Gamma process on R-d, which may be used in applications to model systems of densely distributed particles. First we propose a definition of Gibbs measures over the cone of discrete Radon measures on R-d and then analyze conditions for their existence. Our approach works also for general Levy processes instead of Gamma measures. To this end, we need only the assumption that the first two moments of the involved Levy intensity measures are finite. Also uniform moment estimates for the Gibbs distributions are obtained, which are essential for the construction of related diffusions. Moreover, we prove a Mecke type characterization for the Gamma measures on the cone and an FKG inequality for them. (C) 2013 Elsevier Inc. All rights reserved