Standard approximation schemes in kinetic theory are compared with the effective medium approximation (EMA), that was developed earlier for the stochastic Lorentz gas on cubic lattices. In models with reflecting collisions the low-density results are in strong disagreement with molecular chaos and in excellent agreement with the simulation data. The analysis identifies the diagrams that are taken into account in the different approximations. The EMA accounts in a self-consistent way for all nested ring diagrams.
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G A van Velzen (1990) studied this question.
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