Explaining why simple liquids are quasi-universal

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Resumé

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
OriginalsprogEngelsk
Artikelnummer5424
TidsskriftNature Communications
Vol/bind5
ISSN2041-1723
DOI
StatusUdgivet - 2014

Citer dette

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Explaining why simple liquids are quasi-universal. / Bacher, Andreas Kvist; Schrøder, Thomas; Dyre, J. C.

I: Nature Communications, Bind 5, 5424, 2014.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Explaining why simple liquids are quasi-universal

AU - Bacher, Andreas Kvist

AU - Schrøder, Thomas

AU - Dyre, J. C.

PY - 2014

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N2 - 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

AB - 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

U2 - 10.1038/ncomms6424

DO - 10.1038/ncomms6424

M3 - Journal article

VL - 5

JO - Nature Communications

JF - Nature Communications

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