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Relaxation-time approximation for a Boltzmann gas in Robertson-Walker universe models. (English) Zbl 0828.53082

The relaxation-time approximation for a general relativistic Boltzmann equation is studied in the framework of Einstein’s theory of gravitation. Solutions of the full nonlinear equations for the metric and the distribution function are examined.

MSC:

53Z05 Applications of differential geometry to physics
83F05 Relativistic cosmology
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