Uniqueness without a hard-core assumption for repulsive Gibbs point processes

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Let ϕ\phi be a pair potential satisfying assumptions (A2) and (A3), with activity zz and inverse temperature β\beta. A Gibbs measure is a probability measure describing the equilibrium distribution of the point process under the potential ϕ\phi. Uniqueness conjecture. Under assumptions (A2) and (A3), there is uniqueness of the Gibbs measure when

z supxRd Rd(1eβϕ(x,y))dy<1.z\ \sup_{x \in \mathbb{R}^d} \ \int_{\mathbb{R}^d} \left(1-e^{-\beta \phi(x,y)}\right)\,dy<1.

This would extend the paper's explicit Dobrushin uniqueness region beyond potentials with a hard-core part, including interactions such as the Strauss model. The conjecture is motivated by the fact that, as the discretisation cubes shrink, boundary conditions with more than one point in a cube become increasingly unlikely; deriving the corresponding explicit criterion without the hard-core assumption remains open.

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Primary source

Pierre Houdebert and Alexander Zass, “An explicit Dobrushin uniqueness region for Gibbs point processes with repulsive interactions”, arXiv:2009.06352 (2021).

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