Self-diffusion in a binary critical fluid

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Abstract
The self−diffusion coefficient of a large tagged particle in a binary critical fluid ’’bath’’ is calculated. The validity of the Stokes−Einstein law in the critical system, and the possibility of determining the critical behavior of η, the shear viscosity, from measurements of D via the Stokes−Einstein law are discussed. It is concluded that η cannot be directly deduced from D if the critical correlation length exceeds the tagged particle radius.