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FRW-Type Universe With Vacuum Energy Density | | Arbab I. Arbab
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15 Jun 1999 | | Journal: | Grav.Cosmol. 8 (2002) 227-231 | | Subject: | gr-qc | | Abstract: | We have considered a cosmological model with a cosmological constant of the form $Lambda=3alphafrac{dot R^2}{R^2}+tfrac{ddot R}{R} alpha, t=
m const.$ The cosmological constant is found to decrease as $t^{-2}$ and the rate of particle creation is smaller than the Steady State value. We have found that this behavior gives $frac{Lambda_{Pl}}{Lambda_p}=10^{120}$ where $Lambda_{Pl}$ is the value of $Lambda$ at Planck time. Solutions with $t=3alpha$ in the radiation dominated era and $t=6alpha$ in the matter dominated era are equivalent to the FRW results. We have found an inflationary solution of the de-Sitter type with $t=3-3alpha$. Some problems of the Standard Model may be resolved with the presence of the above cosmological constant in the Einstein’s equation. Since observations suggest a contribution of the vacuum energy density in the range $0.40 | | Source: | arXiv, gr-qc/9906045 | | Services: | Forum | Review | PDF | Favorites | |
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