Global existence of solutions for the Einstein-Boltzmann system with   cosmological constant in the Robertson-Walker space-time for arbitrarily   large initial data
  We prove a global in time existence theorem for the initial value problem for the Einstein-Boltzmann system, with positive cosmological constant and arbitrarily large initial data, in the spatially homogeneous case, in a Robertson-Walker space-time. 
Etienne Takou and Norbert Noutchegueme