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Convergence of Density Expansions of Correlation Functions and the Ornstein-Zernike Equation

机译:相关函数和奥恩斯坦 - Zernike方程密度扩展的收敛性

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We prove absolute convergence of the multi-body correlation functions as a power series in the density uniformly in their arguments. This is done by working in the context of the cluster expansion in the canonical ensemble and by expressing the correlation functions as the derivative of the logarithm of an appropriately extended partition function. In the thermodynamic limit, due to combinatorial cancellations, we show that the coefficients of the above series are expressed by sums over some class of two-connected graphs. Furthermore, we prove the convergence of the density expansion of the "direct correlation function" which is based on a completely different approach and it is valid only for some integral norm. Precisely, this integral norm is suitable to derive the Ornstein-Zernike equation. As a further outcome, we obtain a rigorous quantification of the error in the Percus-Yevick approximation.
机译:我们证明了多体相关功能的绝对收敛,作为均匀密度的功率系列在其参数中。 这是通过在规范集合中的集群扩展的上下文中工作来完成的,并且通过表达相关函数作为适当扩展的分区功能的对数的衍生作用。 在热力学限制中,由于组合取消,我们表明上述系列的系数由某些类别的双连接图中的总和表示。 此外,我们证明了基于完全不同的方法的“直接相关函数”的密度膨胀的收敛性,并且仅针对某种积分标准有效。 精确地,这种积分标准适合于导出Ornstein-Zernike方程。 作为进一步的结果,我们在PERCUS-YEVICK近似值中获得了严格的误差量化。

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