On the rigidity of a hard sphere glass near random close packing

Abstract

We study theoretically and numerically the microscopic cause of the mechanical stability of hard sphere glasses near their maximum packing. We show that, after coarse-graining over time, the hard sphere interaction can be described by an effective potential which is exactly logarithmic at the random close packing ${\varphi }_c$. This allows to define normal modes, and to apply recent results valid for elastic networks: mechanical stability is a non-local property of the packing geometry, and is characterized by some length scale $l^{\ast }$ which diverges at ${\varphi }_c$ [1, 2]. We compute the scaling of the bulk and shear moduli near ${\varphi }_c$, and speculate on the possible implications of these results for the glass transition.

arXiv comment7 pages, 4 figures. Figure 4 had a wrong unit in abscissa, which was corrected

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