Dark Energy and dark matter of the universe from one-loop renormalization of riccion

Details Dark Energy and dark matter of the universe from one-loop renormalization of riccion Dark Energy and dark matter of the universe from one-loop renormalization of riccion

2004-04-22

arxiv.org/abs/hep-th/0404170v5

Physics

High Energy Physics

High Energy Physics - Theory

55 pages

Scientific paper

Here, creation of the universe is obtained only from gravity sector. The dynamical 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 riccion. Solutions of renormalization group equations yield initial value of vaccum energy density $\rho_{\Lambda_{\rm ew}} = 10^6$ GeV^4 and show a phase transition at the electroweak scale $M_{\rm ew}$. As a result of phase transition,energy is released (in the form of background radiation) heating the universe upto temperature $T_{\rm ew} = 78.5$ GeV $= 9.1 \times 10^{14}$ K initially. 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 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. Moreover, particle creation, primordial nucleosynthesis and structure formation in the late universe is discussed for the proposed model.Investigations, here, present a fresh look to cosmology consistent with current observational evidences as well as provide solution to some important problems.

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