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We introduce a semi-schematic mode-coupling model to describe the slowdynamics in molecular liquids, retaining explicitly only the description of thecenter of mass degrees of freedom. Angular degrees of freedom are condensed ina q-vector independent coupling parameter. We compare the time and q-dependenceof the density fluctuation correlators with numerical data from a 250 ns longmolecular dynamics simulation. Notwithstanding the choice of a network-formingliquid as a model for comparing theory and simulation, the model describes themain static and dynamic features of the relaxation in a broad q-vector range.Comment: Revtex, 2 figure

Semischematic model for the center-of-mass dynamics in supercooled molecular liquids