The physics of simple fluids in the hydrodynamic limit and notably the connection between the proper microscopic scales and the macroscopic hydrodynamical description are nowadays well understood. In particular, the three peak shape of the dynamical structure factor is a universal feature, as well as the k-dependence of the peak position () and width , the latter accounting for the sound attenuation rate. In this paper, we present a theoretical model of monodisperse fluid, whose interactions are defined via the Voronoi tessellations of the configurations [called the Voronoi liquid and first studied in Ruscher et al., Europhys. Lett. 112, 66003 (2015)], which displays at low temperatures a marked violation of the universal features of with a sound attenuation rate only . This anomalous behaviour, which apparently violates the basic symmetries of the liquid state, is traced back to the existence of a time scale which is both short enough for the viscoelastic features of the liquid to impact the relaxational dynamics and however long enough for the momentum diffusion to be substantially slower than the sound propagation on that characteristic time.
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14 April 2017
Research Article|
April 11 2017
Anomalous sound attenuation in Voronoi liquid
C. Ruscher;
C. Ruscher
Institut Charles Sadron, CNRS UPR 22,
Université de Strasbourg
, Strasbourg, France
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A. N. Semenov;
A. N. Semenov
Institut Charles Sadron, CNRS UPR 22,
Université de Strasbourg
, Strasbourg, France
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J. Baschnagel;
J. Baschnagel
Institut Charles Sadron, CNRS UPR 22,
Université de Strasbourg
, Strasbourg, France
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J. Chem. Phys. 146, 144502 (2017)
Article history
Received:
December 13 2016
Accepted:
March 23 2017
Citation
C. Ruscher, A. N. Semenov, J. Baschnagel, J. Farago; Anomalous sound attenuation in Voronoi liquid. J. Chem. Phys. 14 April 2017; 146 (14): 144502. https://doi.org/10.1063/1.4979720
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