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Explaining why simple liquids are quasi-universal

Author

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  • Andreas K. Bacher

    (DNRF Center ‘Glass and Time’, IMFUFA, Roskilde University)

  • Thomas B. Schrøder

    (DNRF Center ‘Glass and Time’, IMFUFA, Roskilde University)

  • Jeppe C. Dyre

    (DNRF Center ‘Glass and Time’, IMFUFA, Roskilde University)

Abstract

It has been known for a long time that many simple liquids have surprisingly similar structure as quantified, for example, by the radial distribution function. A much more recent realization is that the dynamics are also very similar for a number of systems with quite different pair potentials. Systems with such non-trivial similarities are generally referred to as ‘quasi-universal’. From the fact that the exponentially repulsive pair potential has strong virial potential-energy correlations in the low-temperature part of its thermodynamic phase diagram, we here show that a liquid is quasi-universal if its pair potential can be written approximately as a sum of exponential terms with numerically large prefactors. Based on evidence from the literature we moreover conjecture the converse, that is, that quasi-universality only applies for systems with this property.

Suggested Citation

  • Andreas K. Bacher & Thomas B. Schrøder & Jeppe C. Dyre, 2014. "Explaining why simple liquids are quasi-universal," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6424
    DOI: 10.1038/ncomms6424
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