Density scaling as a property of strongly correlating viscous liquids

We address a recent conjecture according to which the relaxation time $τ$ of a viscous liquid obeys density scaling ($τ=F(ρ^γ/T)$ where $ρ$ is density) if the liquid is ``strongly correlating,'' i.e., has almost 100% correlation between equilibrium virial and potential-energy fluctuations [Pedersen {\it et al.}, PRL {\bf 100}, 011201 (2008)]. Computer simulations of two model liquids - an asymmetric dumbbell model and the Lewis-Wahnström OTP model - confirm the conjecture and demonstrate that the scaling exponent $γ$ can be accurately predicted from equilibrium fluctuations.

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