Inflationary Universe with a Viscous Fluid Avoiding Self-Reproduction
  We consider a universe with a bulk viscous cosmic fluid, in a flat Friedmann-Lemaitre-Robertson-Walker geometry. We derive the conditions for the existence of inflation, and those which at the same time prevent the occurrence of self-reproduction. Our theoretical model gives results which are in perfect agreement with the most recent data from the PLANCK surveyor. 
I. Brevik, E. Elizalde, V. V. Obukhov and A. V. Timoshkin
gr-qc