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Article	S. Hess, M. Kröger, D.J. Evans Crossover between short- and long-time behavior of stress fluctuations and viscoelasticity of liquids Phys. Rev. E 67 (2003) 042201 (4 pages)
An effective viscosity coefficient is introduced based on definite time averages of equilibrium stress fluctuations rather than stress correlations. Analysis of this quantity via molecular dynamics of a simple model liquid reveals a crossover between the expected short-time elastic and the long-time viscous behavior with increasing averaging time. The procedure allows us to extract the zero-rate shear viscosity when the averaging time becomes one order of magnitude larger than the relevant relaxation time. A relationship between this effective viscosity and the dynamic viscosities is established. for LaTeX users @article{SHess2003-67,  author = {S. Hess and M. Kr\"oger and D. J. Evans},  title = {Crossover between short- and long-time behavior of stress fluctuations and viscoelasticity of liquids},  journal = {Phys. Rev. E},  volume = {67},  pages = {042201},  year = {2003} } \bibitem{SHess2003-67} S. Hess, M. Kr\"oger, D.J. Evans, Crossover between short- and long-time behavior of stress fluctuations and viscoelasticity of liquids, Phys. Rev. E {\bf 67} (2003) 042201 (4 pages). SHess2003-67 S. Hess, M. Kr\"oger, D.J. Evans Crossover between short- and long-time behavior of stress fluctuations and viscoelasticity of liquids Phys. Rev. E,67,2003,042201 (4 pages)