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Density scaling in viscous liquids: From relaxation times to four-point susceptibilities
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, T. B. Schrøder
, U. R. Pedersen
, N. P. Bailey
, and J. C. Dyre
, e-print arXiv:0905.3497
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We present numerical calculations of a four-point dynamic susceptibility, , for the Kob–Andersen Lennard-Jones mixture as a function of temperature and density . Over a relevant range of and , the full -dependence of and thus the maximum in , which is proportional to the dynamic correlation volume, are invariant for state points for which the scaling variable is constant. The value of the material constant is the same as that which superposes the relaxation time of the system versus . Thus, the dynamic correlation volume is a unique function of for any thermodynamic condition in the regime where density scaling holds. Finally, we examine the conditions under which the density scaling properties are related to the existence of strong correlations between pressure and energy fluctuations.
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