The dynamics of scalar-tensor cosmology from RS two-brane model

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dc.creatorJarv, Laur
dc.creatorKuusk, Piret
dc.creatorSaal, Margus
dc.date2006-08-24
dc.date.accessioned2026-07-07T10:24:27Z
dc.date.available2026-07-07T10:24:27Z
dc.descriptionWe consider a Randall-Sundrum two-brane cosmological model in the low energy gradient expansion approximation by Kanno and Soda. It is a scalar-tensor theory with a specific coupling function and a specific potential. Upon introducing the FLRW metric and perfect fluid matter on both branes in the Jordan frame, the effective dynamical equation for the the A-brane (our Universe) scale factor decouples from the scalar field and B-brane matter leaving only a non-vanishing integration constant (the dark radiation term). We find exact solutions for the A-brane scale factor for four types of matter: cosmological constant, radiation, dust, and cosmological constant plus radiation. We perform a complementary analysis of the dynamics of the scalar field (radion) using phase space methods and examine convergence towards the limit of general relativity. In particular, we find that radion stabilizes at a certain finite value for suitable negative matter densities on the B-brane. Observational constraints from Solar system experiments (PPN) and primordial nucleosynthesis (BBN) are also briefly discussed.
dc.description25 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/gr-qc/0608109
dc.identifierhttp://arxiv.org/abs/gr-qc/0608109
dc.identifierPhys.Rev.D75:023505,2007
dc.identifierdoi:10.1103/PhysRevD.75.023505
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176193
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleThe dynamics of scalar-tensor cosmology from RS two-brane model
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