Solving the Flatness and Quasi-flatness Problems in Brans-Dicke Cosmologies with a Varying Light Speed

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dc.creatorBarrow, John D.
dc.creatorMagueijo, Joao
dc.date1999-01-05
dc.date.accessioned2026-07-07T11:34:09Z
dc.date.available2026-07-07T11:34:09Z
dc.descriptionWe define the flatness and quasi-flatness problems in cosmological models. We seek solutions to both problems in homogeneous and isotropic Brans-Dicke cosmologies with varying speed of light. We formulate this theory and find perturbative, non-perturbative, and asymptotic solutions using both numerical and analytical methods. For a particular range of variations of the speed of light the flatness problem can be solved. Under other conditions there exists a late-time attractor with a constant value of Ωthat is smaller than, but of order, unity. Thus these theories may solve the quasi-flatness problem, a considerably more challenging problem than the flatness problem. We also discuss the related Λand quasi-Λproblem in these theories. We conclude with an appraisal of the difficulties these theories may face.
dc.description21 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/9901049
dc.identifierhttp://arxiv.org/abs/astro-ph/9901049
dc.identifierClass.Quant.Grav.16:1435-1454,1999
dc.identifierdoi:10.1088/0264-9381/16/4/030
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/198145
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleSolving the Flatness and Quasi-flatness Problems in Brans-Dicke Cosmologies with a Varying Light Speed
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