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The coupled diffusion equations recently proposed for concentrated hard-sphere suspensions are numerically solved to investigate the dynamics of density fluctuations around time-dependent nonequilibrium ͑spatially inhomogeneous͒ states. As the volume fraction of spheres approaches the critical value g from below, the self-intermediate scattering function F S (k,t) is shown to obey two different slow relaxations whose time scales t ␤ and t ␣ diverge as the separation parameter ϭ(Ϫ g )/ gdoi:10.1103/physreve.55.r29 fatcat:twoiaktwzzhcrbpus6c2mv2nvi