Global Existence of Solutions for the Einstein-Boltzmann System with   Cosmological Constant in the Robertson-Walker Space-time
  We prove a global in time existence theorem for the initial values problem for the Einstein-Boltzmann system with cosmological constant and arbitrarily large initial data, in the spatially homogeneous case, in a Robertson-Walker space-time. 
Etienne Takou and Norbert Noutchegueme