High-temperature exponential clustering conjecture for short-range interactions

From papers

Let Cint>0C_\mathrm{int}>0, b>0b>0, and νN\nu\in\mathbb{N}. For an interaction Ψ\varPsi on Zν\mathbb{Z}^\nu, assume

\normΨexp(b)<Cint.\norm{\varPsi}_{\exp(-b\,\cdot)}<C_\mathrm{int}.

High-temperature exponential clustering conjecture. There exist β\beta^*, CCovC_\mathrm{Cov}, cCov>0c_\mathrm{Cov}>0, and nNn\in\mathbb{N} such that, for every β<β\beta<\beta^* and every finite ΛZν\varLambda\Subset\mathbb{Z}^\nu, the Gibbs state ρβΛ\rho^\varLambda_\beta satisfies decay of correlations, with

CovρβΛ(X;Y)CCov\absXn\absYnecCov\distX,Y\operatorname{Cov}_{\rho^\varLambda_\beta}(X;Y) \leq C_\mathrm{Cov}\,\abs{X}^n\,\abs{Y}^n\,\mathrm{e}^{-c_\mathrm{Cov}\dist{X,Y}}

for all X,YΛX,Y\subset\varLambda. This is the expected extension of the known high-temperature exponential decay for finite-range systems to short-range interactions in arbitrary dimension; the conjectural point is the uniform bound for interactions with exponentially decaying tails.

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Sources & referencesView supporting material

Primary source

Ángela Capel, Massimo Moscolari, Stefan Teufel and Tom Wessel, “From decay of correlations to locality and stability of the Gibbs state”, arXiv:2310.09182 (2025).

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