The effective interactions between two hard spheres mediated by a square-well fluid is studied within the framework of classical density functional theory. The main focus of this study is the behavior of the effective interactions in the supercritical regime close to the Fisher–Widom line, where the decay of the bulk correlations of the solvent changes from monotonic to oscillatory, and close to the Widom line, which is the locus of (local) maxima in the bulk correlation length. The effective interactions are calculated by employing the potential distribution theorem.

中文翻译：

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溶剂介导的相互作用接近费舍尔-维多姆线

在经典密度泛函理论的框架内研究了由方阱流体介导的两个硬球之间的有效相互作用。这项研究的主要重点是在接近Fisher-Widom线的超临界状态下有效相互作用的行为，其中溶剂的整体相关性的衰减从单调变为振荡，并接近Widom线，即本体相关长度中（局部）最大值的轨迹。通过使用势分布定理计算有效相互作用。