Interacting cosmic fluids in power-law Friedmann-Robertson-Walker cosmological models

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dc.creatorCataldo, Mauricio
dc.creatorMella, Patricio
dc.creatorMinning, Paul
dc.creatorSaavedra, Joel
dc.date2008-03-07
dc.date.accessioned2026-07-07T11:33:04Z
dc.date.available2026-07-07T11:33:04Z
dc.descriptionWe provide a detailed description for power--law scaling Friedmann-Robertson-Walker cosmological scenarios dominated by two interacting perfect fluid components during the expansion. As a consequence of the mutual interaction between the two fluids, neither component is conserved separately and the energy densities are proportional to $1/t^{2}$. It is shown that in flat FRW cosmological models there can exist interacting superpositions of two perfect fluids (each of them having a positive energy density) which accelerate the expansion of the universe. In this family there also exist flat power law cosmological scenarios where one of the fluids may have a ``cosmological constant" or "vacuum energy" equation of state ($p =-ρ$) interacting with the other component; this scenario exactly mimics the behavior of the standard flat Friedmann solution for a single fluid with a barotropic equation of state. These possibilities of combining interacting perfect fluids do not exist for the non-interacting mixtures of two perfect cosmic fluids, where the general solution for the scale factor is not described by power--law expressions and has a more complicated behavior. In this study is considered also the associated single fluid model interpretation for the interaction between two fluids.
dc.description10 pages. Accepted for publication in Physics Letters B
dc.identifierhttps://arxiv.org/abs/0803.1086
dc.identifierhttp://arxiv.org/abs/0803.1086
dc.identifierPhys.Lett.B662:314-322,2008
dc.identifierdoi:10.1016/j.physletb.2008.03.022
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197767
dc.subjectHigh Energy Physics - Theory
dc.titleInteracting cosmic fluids in power-law Friedmann-Robertson-Walker cosmological models
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