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Cosmic Acceleration With A Positive Cosmological Constant | | Arbab I. Arbab
; | | Rating: | Visitors: 5/5 (1 visitor) | | Date: |
19 May 1999 | | Journal: | Class.Quant.Grav. 20 (2003) 93-100 | | Subject: | gr-qc astro-ph | | Abstract: | We have considered a cosmological model with a phenomenological model for the cosmological constant of the form $Lambda=tfr{ddot R}{R}$, $ t$ is a constant. For age parameter consistent with observational data the Universe must be accelerating in the presence of a positive cosmological constant. The minimum age of the Universe is $H_0^{-1}$, where $H_0$ is the present Hubble constant. The cosmological constant is found to decrease as $t^{-2}$. Allowing the gravitational constant to change with time leads to an ever increasing gravitational constant at the present epoch. In the presence of a viscous fluid this decay law for $Lambda$ is equivalent to the one with $Lambda=3alpha H^2$ ($alpha=
m const.$) provided $alpha=fr{t}{3(t-2)}$. The inflationary solution obtained from this model is that of the de-Sitter type. | | Source: | arXiv, gr-qc/9905066 | | Services: | Forum | Review | PDF | Favorites | |
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