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arXiv · 2508.12078

A Multi-Body Dobrushin-Sokal Criterion -- Part I

Jan Philipp Neumann
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Abstract

We derive a sufficient condition for zero-freeness of partition functions applicable to lattice gases with possibly complex-valued multi-body interactions. This includes the case of hard-core interactions and, in particular, generalises recent results by Galvin et al.\ (2024) and Bencs-Buys (2025) on zero-free polydiscs of hypergraph independence polynomials. We provide two proofs: the first generalises the inductive approach of Bencs and Buys; the second employs the Kirkwood-Salsburg hierarchy. Notably, the central argument of the second proof uses of a certain partition scheme for coverings and, as a by-product, we obtain a direct improvement of Gallavotti and Miracle-Sol\'e's (1968) bounds for the Kirkwood-Salsburg operator.

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Jan Philipp Neumann. 2025-08-16. A Multi-Body Dobrushin-Sokal Criterion -- Part I. https://arxiv.org/abs/2508.12078

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