A mesoscopic coarse-graining framework is used to construct a perturbation expansion for the free energy that recovers the van der Waals equation at first order and structure-factor results at second order while adding mutual-information terms for non-extensivity.
Osano, Entropy Additivity from exponential decay of correlations: a coarse-grained operator approachsubmit/7606660.(2026)
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Perturbation Theory of the Free Energy via the Mesoscopic Combined Partition Function
A mesoscopic coarse-graining framework is used to construct a perturbation expansion for the free energy that recovers the van der Waals equation at first order and structure-factor results at second order while adding mutual-information terms for non-extensivity.