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Linked cluster expansion of the many-body path integral

机译:LINKED集群扩展的多体路径积分

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摘要

We develop an approach of calculating the many-body path integral based on the linked cluster expansion method. First, we derive a linked cluster expansion and we give the diagrammatic rules for calculating the free energy and the pair distribution function g(r) as a systematic power-series expansion in the particle density. We also present a structured Pade approximation scheme in the momentum space to determine g(r). The calculated g(r) for distinguishable particles interacting with Lennard-Jones and hard-sphere potential in various attempted schemes of approximation of the diagrammatic series compares very well with the results of path-integral Monte Carlo simulation. Our method is applicable to a wide range of problems of current general interest and may be extended to the case of identical particles and, in particular, to the case of the many-fermion problem.
机译:我们开发了一种基于链接集群扩展方法计算多体路径积分的方法。首先,我们推出了链接的群集扩展,我们提供了用于计算自由能量和对分布函数G(R)作为粒子密度的系统电源串联扩展的图形规则。我们还在动量空间中提出了一种结构化梯度近似方案,以确定G(R)。计算的用于与leennard-jones的可区分颗粒的可区分颗粒和近似示例系列的近似方案的硬球电位相互作用,与路径整体蒙特卡罗模拟的结果非常好。我们的方法适用于当前一般兴趣的广泛问题,并且可以延伸到相同粒子的情况,特别是对许多费偶问题的情况。

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  • 来源
    《Physical review》 |2019年第17期|174203.1-174203.17|共17页
  • 作者单位

    Florida State Univ Dept Phys Tallahassee FL 32306 USA|Florida State Univ Natl High Magnet Field Lab Tallahassee FL 32306 USA;

    Florida State Univ Dept Phys Tallahassee FL 32306 USA|Florida State Univ Natl High Magnet Field Lab Tallahassee FL 32306 USA|Univ Athens Dept Phys Athens 15784 Greece;

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