2004/04/22 by S. K. Srivastava, Srivastava, S. K.
Computer Science · Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #Computational Physics and Python Applications #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th) #astro-ph #gr-qc #hep-th
paper · pdf · doi:10.48550/arxiv.hep-th/0404170
55 pages
openalex publication_date 2004/04/22 · arxiv created 2005/10/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 ρ_Λ\rm ew = 106 GeV4 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 × 1014 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 1087 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.