A support property for infinite dimensional interacting diffusion processes

The Dirichlet form associated with the intrinsic gradient on Poisson space is known to be quasi-regular on the complete metric space $\ddotΓ=$ $\{Z_+$-valued Radon measures on $\IR^d\}$. We show that under mild conditions, the set $\ddotΓ\setminusΓ$ is $\e$-exceptional, where $Γ$ is the space of locally finite configurations in $\IR^d$, that is, measures $γ\in\ddotΓ$ satisfying $\sup_{x\in\IR^d}γ(\{x\})\leq 1$. Thus, the associated diffusion lives on the smaller space $Γ$. This result also holds for Gibbs measures with superstable interactions.

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