Abstract
This paper analyzes molecular dynamicssimulation results on the small-molecule glass formerortho-terphenyl (OTP). The data can be describedwell using the coupling model of relaxation. Thedynamic susceptibility calculated from thedensity-density time correlation function is shown toapproximately conform to the scaling laws of modecoupling theory. Since the dynamic singularities ofmode coupling theory are absent in the coupling model,both approaches to high frequency structuralrelaxation can not be correct; the conformance to modecoupling theory indicates the non-uniqueness of modecoupling theory interpretation of data from fragileliquids. The non-cooperative relaxation time fordensity fluctuations in OTP is found to have the sameactivation energy as the shear viscosity in the hightemperature limit. This illustrates the relationshipbetween microscopic dynamic variables and the shorttime behavior of macroscopic properties, when theformer are analyzed according to the coupling model.
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