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最大随机堵塞颗粒堆积中的超均匀性、准长程相关性和空隙空间约束。I. 多分散球体

Hyperuniformity, quasi-long-range correlations, and void-space constraints in maximally random jammed particle packings. I. Polydisperse spheres.

作者信息

Zachary Chase E, Jiao Yang, Torquato Salvatore

机构信息

Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.

出版信息

Phys Rev E Stat Nonlin Soft Matter Phys. 2011 May;83(5 Pt 1):051308. doi: 10.1103/PhysRevE.83.051308. Epub 2011 May 31.

Abstract

Hyperuniform many-particle distributions possess a local number variance that grows more slowly than the volume of an observation window, implying that the local density is effectively homogeneous beyond a few characteristic length scales. Previous work on maximally random strictly jammed sphere packings in three dimensions has shown that these systems are hyperuniform and possess unusual quasi-long-range pair correlations decaying as r(-4), resulting in anomalous logarithmic growth in the number variance. However, recent work on maximally random jammed sphere packings with a size distribution has suggested that such quasi-long-range correlations and hyperuniformity are not universal among jammed hard-particle systems. In this paper, we show that such systems are indeed hyperuniform with signature quasi-long-range correlations by characterizing the more general local-volume-fraction fluctuations. We argue that the regularity of the void space induced by the constraints of saturation and strict jamming overcomes the local inhomogeneity of the disk centers to induce hyperuniformity in the medium with a linear small-wave-number nonanalytic behavior in the spectral density, resulting in quasi-long-range spatial correlations scaling with r(-(d+1)) in d Euclidean space dimensions. A numerical and analytical analysis of the pore-size distribution for a binary maximally random jammed system in addition to a local characterization of the n-particle loops governing the void space surrounding the inclusions is presented in support of our argument. This paper is the first part of a series of two papers considering the relationships among hyperuniformity, jamming, and regularity of the void space in hard-particle packings.

摘要

超均匀多粒子分布具有局部数方差,其增长速度比观测窗口的体积慢,这意味着在几个特征长度尺度之外,局部密度实际上是均匀的。先前关于三维最大随机紧密堆积球体的研究表明,这些系统是超均匀的,并且具有不寻常的准长程对关联,其衰减形式为r(-4),导致数方差呈反常的对数增长。然而,最近关于具有尺寸分布的最大随机紧密堆积球体的研究表明,这种准长程关联和超均匀性在紧密硬粒子系统中并非普遍存在。在本文中,我们通过表征更一般的局部体积分数涨落,表明此类系统确实具有标志性的准长程关联且是超均匀的。我们认为,由饱和和严格堵塞的约束所诱导的空隙空间的规则性克服了圆盘中心的局部不均匀性,从而在介质中诱导出超均匀性,其频谱密度具有线性小波数非解析行为,在d维欧几里得空间中导致准长程空间关联按r(-(d + 1))缩放。此外,还给出了二元最大随机紧密堆积系统的孔径分布的数值和解析分析,以及对控制夹杂物周围空隙空间的n粒子环的局部表征,以支持我们的论点。本文是关于硬粒子堆积中超均匀性、堵塞和空隙空间规则性之间关系的两篇系列论文的第一篇。

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