ar X iv : h ep - t h / 04 04 17 0 v 2 1 2 A ug 2 00 4 Dark Energy and Dark Matter of the universe from One - loop renormalization of Riccion

Here, creation of the universe is obtained out of gravity only. The dy-namical universe begins with two basic ingredients (i)vacuum energy, also called dark energy (as vacuum energy is not observed) and (ii) background radiation. These two are obtained through one-loop renormalization of ric-cion. In the proposed cosmology, it is found that not only current universe expands with acceleration, but it undergoes accelerated expansion from the beginning itself. It is demonstrated that dark energy decays to dark matter and the ratio of dark matter density and dark energy density remains less than unity upto a long time in future universe also, providing a solution to cosmic coincidence problem. Future course of the universe is also discussed here. It is shown how entropy of the universe grows upto 10 87 in the present universe. Investigations, here, present a fresh look to cosmology consistent with current observational evidences as well as provide solution to some im-1 portant problems.dimensional higher-derivative gravity, Quantum Field Theory in curved spaces, One-loop renormalization. Experimental probes, like luminosity measurements of high redshift su-pernova [1], anisotropies in cosmic microwave background [2] and observational gravitational clustering [3], strongly indicate late time accelerated expansion of the universe. Theoretically, accelerated expansion of the universe can be obtained either by modifying left hand side of Einstein's equations, like introduction of C-field in steady− state theory adhered to the Perfect Cos