Modified mode-coupling theory for the collective dynamics of simple liquids

Recently it has been shown that mode-coupling theory, which accounts for the salient features of glassy relaxation near the liquid-glass transition, is also capable of describing the collective excitations of simple liquids away from the glass transition. In order to further improve the agreement between theory and computer simulations on Lennard-Jones argon we modify MCT by taking binary collisions into account. This, in fact, improves the agreement. We also show that multiplying the memory function of the original theory with a reduction factor leads to similar results.