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AN ACCELERATING UNIVERSE IN A 5D NON-COMPACT AND NON-RICCI-FLAT KALUZA{KLEIN COSMOLOGY

The recent distance measurements from the light-curves of several hundred type Ia supernovae suggest that our universe is currently undergoing a period of acceleration. The question of dark energy has been therefore the focus of a large amount of activities in recent years within Quintessence, Phantom and K-essence models. In this paper, based on the idea of higher dimension, a 5D cosmological model is introduced which is not Ricci flat and is coupled to a higher dimensional energy momentum tensor. It is shown that the higher dimensional sector of this model may induce a dark pressure in four dimensional universe so that for a flat universe under specific conditions one may have early inflation, subsequent deceleration and current acceleration.