A linearly Expanding Universe With Variable G and Lambda

Simple item page
dc.creatorArbab, Arbab I.
dc.date1999-09-14
dc.date1999-10-21
dc.date.accessioned2026-07-07T03:33:34Z
dc.date.available2026-07-07T03:33:34Z
dc.descriptionWe have studied a cosmological model with a cosmological term of the form $Λ=3α\fr{\dot R^2}{R^2}+\bt\fr{\ddot R}{R}+\fr{3γ}{R^2} α, \ \bt γ$ are constants. The scale factor (R) is found to vary linearly with time for both radiation and matter dominated epochs. The cosmological constant is found to decrease as $t^{-2}$ and the rate of particle creation is smaller than the Steady State value. The model gives $Ω^Λ=\fr{1}{3}$ and $Ω^m=\fr{2}{3}$ in the present era, $Ω^Λ=Ω^m=\fr{1}{2}$ in the radiation era. The present age of the universe $(\rm t_p$) is found to be $\rm t_p=H_p^{-1}$ , where $\rm H_p$ is the Hubble constant. The model is free from the main problems of the Standard Model. Since the scale factor $\rm R\propto t$ during the entire evolution of the universe the ratio of the cosmological constant at the Planck and present time is $\rm\fr{Λ_{Pl}}{Λ_p}=10^{120}$. This decay law justifies why, today, the cosmological constant is exceedingly small.
dc.descriptionA revised version
dc.identifierhttps://arxiv.org/abs/gr-qc/9909044
dc.identifierhttp://arxiv.org/abs/gr-qc/9909044
dc.identifierSpacetime & Substance 1(6) (2001) 39
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/36616
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleA linearly Expanding Universe With Variable G and Lambda
dc.typetext

Files

Collections

arXiv