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arXiv 1010.1772cond-mat.soft
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粘性硬球流体的基本测度理论

A fundamental measure theory for the sticky hard sphere fluid

Hendrik Hansen-Goos, J. S. Wettlaufer

摘要:

我们构造了一个适用于粘性硬球(SHS)流体的密度泛函理论(DFT),它类似于Rosenfeld的硬球流体的基本测度理论(FMT)[Phys.Rev.Lett.1999]。{ \bf 63},980(1989)]基于一组加权密度和来自标度粒子理论(SPT)的精确结果。证明了非均匀SHS流体$Φ_{\text{SHS}}$的过剩自由能量密度是唯一定义的,当(a)它仅仅是Kierlik和Rosinberg版本FMT [Phys.Rev.A { \bf 42},3382(1990)]的加权密度的函数,(b)它满足SPT微分方程,以及(c)它从Gazzillo和Giacometti [J. Chem. Phys. { \bf 120},4742(2004)]引入的广义Percus-Yevick闭包类中产生任何给定的直接关联函数(DCF)。所得到的DFT被证明是在非常好的协议与模拟数据。特别是,该FMT产生正确的接触值的密度分布,没有可调的参数。而不是需要更高阶的DCF,如微扰DFT,我们的SHS FMT产生它们。有趣的是,虽然等价于Kierlik和Rosinberg的FMT在硬球的情况下,Rosenfeld的原始FMT使用的加权密度集是不足以构建一个DFT产生SHS DCF。

英文摘要:

We construct a density functional theory (DFT) for the sticky hard sphere (SHS) fluid which, like Rosenfeld's fundamental measure theory (FMT) for the hard sphere fluid [Phys. Rev. Lett. {\bf 63}, 980 (1989)], is based on a set of weighted densities and an exact result from scaled particle theory (SPT). It is demonstrated that the excess free energy density of the inhomogeneous SHS fluid $Φ_{\text{SHS}}$ is uniquely defined when (a) it is solely a function of the weighted densities from Kierlik and Rosinberg's version of FMT [Phys. Rev. A {\bf 42}, 3382 (1990)], (b) it satisfies the SPT differential equation, and (c) it yields any given direct correlation function (DCF) from the class of generalized Percus-Yevick closures introduced by Gazzillo and Giacometti [J. Chem. Phys. {\bf 120}, 4742 (2004)]. The resulting DFT is shown to be in very good agreement with simulation data. In particular, this FMT yields the correct contact value of the density profiles with no adjustable parameters. Rather than requiring higher order DCFs, such as perturbative DFTs, our SHS FMT produces them. Interestingly, although equivalent to Kierlik and Rosinberg's FMT in the case of hard spheres, the set of weighted densities used for Rosenfeld's original FMT is insufficient for constructing a DFT which yields the SHS DCF.

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