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arXiv 1202.0259cond-mat.stat-mechcond-mat.dis-nncond-mat.mtrl-sci
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随机紧密堆积时的稳定性

Stability at Random Close Packing

Matthieu Wyart

摘要:

硬颗粒的包装,可以说是最简单的结构玻璃,不能通过重新排列它们的接触网络被压缩的要求,产生了一个新的约束,其微观结构。该约束的形式为接触力分布P(f)和对分布函数g(r)之间的界限:如果P(f)\sim f^θ和g(r)\sim(r-σ)^(-γ),其中σ是颗粒直径,则发现γ \geq 1/(2+θ)。这种束缚所起的作用类似于在一些具有长程相互作用的玻璃材料中发现的作用,例如安德森绝缘体中的库仑隙或平均场自旋玻璃中的局部场分布。有理由相信,这个约束是饱和的,提供了一个解释雪崩的重排与幂律统计观察包装的存在。

英文摘要:

The requirement that packings of hard particles, arguably the simplest structural glass, cannot be compressed by rearranging their network of contacts is shown to yield a new constraint on their microscopic structure. This constraint takes the form a bound between the distribution of contact forces P(f) and the pair distribution function g(r): if P(f) \sim f^θ and g(r) \sim (r-σ)^(-γ), where σ is the particle diameter, one finds that γ \geq 1/(2+θ). This bound plays a role similar to those found in some glassy materials with long-range interactions, such as the Coulomb gap in Anderson insulators or the distribution of local fields in mean-field spin glasses. There is ground to believe that this bound is saturated, offering an explanation for the presence of avalanches of rearrangements with power-law statistics observed in packings.

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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