Özet:
In the thesis we calculated Boltzmann Equation in RW metric. After that in the at space-like slices we showed that for RW metric it is not possible to nd any equilibrium solutions. However we looked for the equilibrium solutions in the two limits when mass goes to zero and when mass goes to in nity. Then we applied these result to the Bose-Einstein and to the Fermi-Dirac statistics for nding the equilibrium solution in the limits. Finally in the Bose-Einstein Condensation we calculated critical temperature.
