Gibbs cluster measures on configuration spaces

AbstractThe probability distribution gcl of a Gibbs cluster point process in X=Rd (with i.i.d. random clusters attached to points of a Gibbs configuration with distribution g) is studied via the projection of an auxiliary Gibbs measure gˆ in the space of configurations γˆ={(x,y¯)}⊂X×X, where x∈X indicates a cluster “center” and y¯∈X:=⊔nXn represents a corresponding cluster relative to x. We show that the measure gcl is quasi-invariant with respect to the group Diff0(X) of compactly supported diffeomorphisms of X, and prove an integration-by-parts formula for gcl. The associated equilibrium stochastic dynamics is then constructed using the method of Dirichlet forms