Abstract
We report a numerical study of the shear viscosity and the frequency dependent elasticmoduli close to dynamical arrest for a model of short range attractive colloids,both for the repulsive and the attractive glass transition. Calculating the stressautocorrelation functions, we find that density fluctuations of wavevectors close to thefirst peak in the structure factor control the viscosity rise on approaching therepulsive glass, while fluctuations of larger wavevectors control the viscosity close tothe attractive glass. On approaching the glass transition, the viscosity divergeswith a power law with the same exponent as the density autocorrelation time.
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