Continuum Approximations to Systems of Correlated Interacting Particles

Continuum Approximations to Systems of Correlated Interacting Particles
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相关相互作用粒子系统的连续近似

DOI:
10.1007/s10955-018-2205-8
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发表时间:
2019
影响因子:
1.6
通讯作者:
Potomkin, Mykhailo
Potomkin, Mykhailo
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Berlyand, Leonid;Creese, Robert;Jabin, Pierre-Emmanuel;Potomkin, Mykhailo

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我们考虑一个具有随机初始条件的相互作用粒子系统。基于BBGKY层次结构的截断,描述并模拟了系统的连续统近似,用于各种初始分布和相互作用类型。具体来说,我们比较了平均场近似(MFA)、Kirkwood叠加近似(KSA)和最近开发的BBGKY层次结构的截断(截断近似- ta)。我们表明,在捕获从蒙特卡罗模拟获得的近似分布(直方图)方面,KSA和TA比MFA更准确。此外,与KSA相比,TA在数值上更稳定,计算成本更低。
We consider a system of interacting particles with random initial conditions. Continuum approximations of the system, based on truncations of the BBGKY hierarchy, are described and simulated for various initial distributions and types of interaction. Specifically, we compare the mean field approximation (MFA), the Kirkwood superposition approximation (KSA), and a recently developed truncation of the BBGKY hierarchy (the truncation approximation—TA). We show that KSA and TA perform more accurately than MFA in capturing approximate distributions (histograms) obtained from Monte Carlo simulations. Furthermore, TA is more numerically stable and less computationally expensive than KSA.
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