Coupled fluids model in FRW space-time
  In this paper, we analyze a two coupled fluids model by investigating several solutions for accelerated universe in flat FRW space-time. One of the fluids can be identified with the matter and the model possesses the standard matter solution also. Beyond the removal of the coincidence problem, we will see how the coupling may change the description of the energy contents of the universe and which features can be aquired with respect to the standard decoupled cases. 
Shynaray Myrzakul, Ratbay Myrzakulov, Lorenzo Sebastiani
gr-qc