Perturbation Theory of the Free Energy via the Mesoscopic Combined Partition Function

Abstract

We develop a systematic perturbation theory for the Helmholtz free energy of a classical $N$-body system within the mesoscopic framework of~\cite{OsanoMeso,OsanoExtensivity}. The combined coarse-graining operator $\mathcal{C}=\mathcal{C}_x\circ\mathcal{C}_p$ acting on single-particle phase space partitions it into product cells $C_{i,α}=V_i\timesΠ_α$ and generates a mesoscopic partition function $\mathcal{Z}_{\rm meso}(λ)$ whose reference level factorises by the multinomial theorem: $\mathcal{Z}_{\rm meso}^{(0)}=(Z_1^{(0)})^N$. Perturbation theory for $\mathcal{F}_{\rm meso}(λ)=-k_BT\ln\mathcal{Z}_{\rm meso}(λ)$ in the inter-cell perturbation $\mathcal{V}_{\rm meso}$ yields the mesoscopic Gibbs--Bogoliubov inequality and an exact coupling-parameter integration formula. The full free energy satisfies \begin{equation*} F(λ)=\mathcal{F}_{\rm meso}(λ)-k_BT\!\sum_{i<j}I(i,j;λ)+O\!\left(|Λ|\ell^{-d}e^{-2\ell/ξ}\right), \end{equation*} where the inter-cell mutual informations $I(i,j;λ)$ are the corrections identified in the extensivity analysis. The first-order theory recovers the van der Waals equation and the Barker--Henderson result; the second-order term converges to the structure-factor formula in the fine-cell limit. For long-range interactions, factorisation fails, and the mutual-information corrections quantify the resulting non-extensivity.