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arXiv 2607.03032cond-mat.softcond-mat.stat-mech
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熵密度泛函普遍性:关联、响应和熵奥恩斯坦 - 泽尔尼克结构

Entropy functional universality: Correlation, response, many-body interaction, multi-component, quantum, hyperfunctional, and Ornstein-Zernike structure

Universität Bayreuth(拜罗伊特大学)

Matthias Schmidt

AI总结:

介绍经典多体系统平衡统计力学的熵密度泛函理论,基于联合巨势最小化,通过泛函微分得熵直接关联泛函,给出元密度泛函映射存在唯一性证明,还描述了相关积分并推广理论。

摘要:

我们全面阐述了最近用于经典多体系统平衡统计力学的熵密度泛函理论(arXiv:2606.28240)。该方法形式上是精确的,基于一体密度和全局对距离分布的联合巨势最小化原理。这些变分场分别依赖于位置和标量距离,保留了标准密度泛函理论的低计算复杂度。关联效应包含在一个独特的过剩熵泛函中,该泛函在所有具有成对粒子间势的系统中是通用的。泛函微分产生熵直接关联泛函,通过耦合的奥恩斯坦 - 泽尔尼克方程生成熵响应和涨落关联函数。基于列维约束搜索方法或默明 - 埃文斯反证法的推广,给出了基础元密度泛函映射存在性和唯一性的两种替代证明。简单的过剩熵近似产生标准平均场和第二维里过剩自由能密度泛函。我们描述了精确的熵泛函线积分,与最近的一体涨落分布建立联系,并将熵方法推广到成对粒子间势之外。

英文摘要:

We give a comprehensive account of the recent entropy functional theory for the equilibrium statistical mechanics of classical many-body systems (arXiv:2606.28240). The approach is formally exact and based on a joint grand potential minimization principle for the one-body density and the global pair distance distribution. These variational fields depend respectively on position and on scalar distance, which retains the low computational complexity of standard density functional theory. Correlation effects are contained in a unique excess entropy functional, which is universal across all systems with pairwise interparticle potentials. Functional differentiation yields entropic direct correlation functionals that generate entropic response and fluctuation correlation functions via coupled Ornstein-Zernike equations. Two alternative proofs are given for the existence and uniqueness of the underlying metadensity functional map, based on generalizations of either Levy's constrained search method or Mermin-Evans proof by contradiction. Simple excess entropy approximations yield the standard mean-field and second-virial excess free energy density functionals. We describe exact entropic functional line integrals, make connections to the recent one-body fluctuation profiles, and generalize the entropy approach beyond pairwise interparticle potentials via parametric dependence or reduction operators. We also lay out the formulation for multi-component systems, the hyperfunctional for general observables, and the quantum entropy functional.

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