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A model universe is proposed in the framework of 5-dimensional noncompactKaluza-Klein cosmology which is not Ricci flat. The 4D part as theRobertson-Walker metric is coupled to conventional perfect fluid, and itsextra-dimensional part is coupled to a dark pressure through a scalar field. Itis shown that neither early inflation nor current acceleration of the 4Duniverse would happen if the non-vacuum states of the scalar field wouldcontribute to 4D cosmology.

A 5D non compact and non Ricci flat Kaluza-Klein Cosmology