Testing "microscopic" theories of glass-forming liquids

Details Testing "microscopic" theories of glass-forming liquids Testing "microscopic" theories of glass-forming liquids

2011-05-17

arxiv.org/abs/1105.3291v2

Eur. Phys. J. E 34, 96 (2011)

Physics

Condensed Matter

Statistical Mechanics

10 pages, 7 figs; Accepted to EPJE Special Issue on The Physics of Glasses. Arxiv version contains an addendum to the appendix

Scientific paper

10.1140/epje/i2011-11096-5

We assess the validity of "microscopic" approaches of glass-forming liquids based on the sole k nowledge of the static pair density correlations. To do so we apply them to a benchmark provided by two liquid models that share very similar static pair density correlation functions while disp laying distinct temperature evolutions of their relaxation times. We find that the approaches are unsuccessful in describing the difference in the dynamical behavior of the two models. Our study is not exhausti ve, and we have not tested the effect of adding corrections by including for instance three-body density correlations. Yet, our results appear strong enough to challenge the claim that the slowd own of relaxation in glass-forming liquids, for which it is well established that the changes of the static structure factor with temperature are small, can be explained by "microscopic" appr oaches only requiring the static pair density correlations as nontrivial input.

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