Entropy of jammed matter

Details Entropy of jammed matter Entropy of jammed matter

2008-08-15

arxiv.org/abs/0808.2190v2

Phys. Rev. Lett. 101, 188001 (2008)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 1 figure

Scientific paper

We investigate the nature of randomness in disordered packings of frictional spheres. We calculate the entropy of 3D packings through the force and volume ensemble of jammed matter, a mesoscopic ensemble and numerical simulations using volume fluctuation analysis and graph theoretical methods. Equations of state are obtained relating entropy, volume fraction and compactivity characterizing the different states of jammed matter. At the mesoscopic level the entropy vanishes at random close packing. The entropy of the jammed system reveals that the random loose packings are more disordered than random close packings, allowing for an unambiguous interpretation of both limits.

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