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arXiv 1507.08528cond-mat.stat-mechcond-mat.soft
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非均匀流体随机相近似的密度泛函公式:高斯核和库仑粒子的应用

Density functional formulation of the Random Phase Approximation for inhomogeneous fluids: application to the Gaussian core and Coulomb particles

Derek Frydel, Manman Ma

摘要:

使用绝热连接,我们制定了一个虚构的系统,$h_λ({\bf r},{\bf r}')$,其中$λ$决定的相互作用强度的关联函数的自由能。为了获得$h_λ({\bf r},{\bf r}')$,我们使用Ornstein-Zernike方程,这两个方程构成了一个通用的液态框架,用于处理非均匀流体。由于这两个方程不形成闭集,因此需要近似闭合关系,并且它决定了近似的类型。在目前的工作中,我们研究的随机相位近似(RPA)封闭。我们确定,这种近似是相同的变分高斯近似的框架内得出的场理论。然后,我们将我们的广义RPA近似高斯核心模型和库仑电荷。

英文摘要:

Using the adiabatic connection, we formulate the free energy in terms of the correlation function of a fictitious system, $h_λ({\bf r},{\bf r}')$, where $λ$ determines the interaction strength. To obtain $h_λ({\bf r},{\bf r}')$ we use the Ornstein-Zernike equation, and the two equations constitute a general liquid-state framework for treating inhomogeneous fluids. As the two equations do not form a closed set, an approximate closure relation is required and it determines a type of an approximation. In the present work we investigate the random phase approximation (RPA) closure. We determine that this approximation is identical to the variational Gaussian approximation derived within the framework of the field-theory. We then apply our generalized RPA approximation to the Gaussian core model and Coulomb charges.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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