Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2007-11-22
Gen.Rel.Grav.40:1653-1662,2008
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
10 pages, no figures, accepted for publication in General Relativity and Gravitation
Scientific paper
10.1007/s10714-007-0565-5
Cosmological models with two interacting fluids, each satisfying the strong energy condition, are studied in the framework of classical General Relativity. If the interactions are phenomenologically described by a power law in the scale factor, the two initial interacting fluids can be equivalently substituted by two non interacting effective fluids, where one of them may violate the strong energy condition and/or have negative energy density. Analytical solutions of the Friedmann equations of this general setting are obtained and studied. One may have, depending on the scale where the interaction becomes important, non singular universes with early accelerated phase, or singular models with transition from decelerated to accelerated expansion at large scales. Among the first, there are bouncing models where contraction is stopped by the interaction. In the second case, one obtains dark energy expansion rates without dark energy, like $\Lambda$CDM or phantomic accelerated expansions without cosmological constant or phantoms, respectively.
Fraga Bernardo M. O.
Pinto-Neto Nelson
No associations
LandOfFree
Cosmic acceleration from interaction of ordinary fluids does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cosmic acceleration from interaction of ordinary fluids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic acceleration from interaction of ordinary fluids will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-311077