Sound-propagation gap in fluid mixtures

Supurna Sinha, M. Cristina Marchetti

Research output: Contribution to journalArticlepeer-review


We discuss the behavior of the extended sound modes of a dense binary hard-sphere mixture. In a dense simple hard-sphere fluid the Enskog theory predicts a gap in the sound propagation at large wave vectors. In a binary mixture the gap is only present for low concentrations of one of the two species. At intermediate concentrations sound modes are always propagating. This behavior is not affected by the mass difference of the two species, but it only depends on the packing fractions. The gap is absent when the packing fractions are comparable and the mixture structurally resembles a metallic glass.

Original languageEnglish (US)
Pages (from-to)5015-5018
Number of pages4
JournalPhysical Review A
Issue number8
StatePublished - 1990

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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