期刊
NATURE PHYSICS
卷 13, 期 9, 页码 848-+出版社
NATURE PORTFOLIO
DOI: 10.1038/NPHYS4168
关键词
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资金
- Gates Cambridge Scholarship
- Swiss National Science Foundation [P2EZP2-152188, P300P2-161078]
- EPSRC [EP/I001352/1, EP/I000844/1]
- NSF-DMR [1409093]
- W. M. Keck Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1409093] Funding Source: National Science Foundation
- Swiss National Science Foundation (SNF) [P300P2_161078, P2EZP2_152188] Funding Source: Swiss National Science Foundation (SNF)
- EPSRC [EP/I000844/1, EP/I001352/1] Funding Source: UKRI
In the late 1980s, Sam Edwards proposed a possible statistical-mechanical framework to describe the properties of disordered granular materials(1). A key assumption underlying the theory was that all jammed packings are equally likely. In the intervening years it has never been possible to test this bold hypothesis directly. Here we present simulations that provide direct evidence that at the unjamming point, all packings of soft repulsive particles are equally likely, even though generically, jammed packings are not. Typically, jammed granular systems are observed precisely at the unjamming point since grains are not very compressible. Our results therefore support Edwards' original conjecture. We also present evidence that at unjamming the configurational entropy of the system is maximal.
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