de Gennes slowing of density fluctuations in ordinary and supercooled liquids

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Abstract
We discuss the slowing mechanisms of the intermediate scattering function for wave vectors near the position of the main peak of the structure factor. Simulation data in ordinary and supercooled liquid rubidium show that the decay rate at long times is much slower than that predicted by the usual viscoelastic theories, particularly in the quenched system. This feature is accounted for by a simple mode-coupling calculation.