Origin of FRW cosmology in slow-roll inflation from noncompact   Kaluza-Klein theory
  Using a recently introduced formalism we discuss slow-roll inflaton from Kaluza-Klein theory without the cylinder condition. In particular, some examples corresponding to polynomic and hyperbolic $\phi$-potentials are studied. We find that the evolution of the fifth coordinate should be determinant for both, the evolution of the early inflationary universe and the quantum fluctuations. 
Edgar Madriz Aguilar (IFM, Michoacana University) and Mauricio Bellini   (Mar del Plata University)