Friedmann Robertson Walker models with Conformally Coupled Massive   Scalar Fields are Non-integrable
  In this work we use a recently developed nonintegrability theorem of Morales and Ramis to prove that the Friedmann Robertson Walker cosmological model with a conformally coupled massive scalar field is nonintegrable. 
L. A. A. Coelho, J. E. F. Skea and T. J. Stuchi