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Galaxies, Volume 1, Issue 2 (September 2013) – 3 articles , Pages 83-113

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206 KiB  
Review
Rip Cosmology via Inhomogeneous Fluid
by Valerii V. Obukhov, Alexander V. Timoshkin and Evgenii V. Savushkin
Galaxies 2013, 1(2), 107-113; https://doi.org/10.3390/galaxies1020107 - 15 Aug 2013
Cited by 2 | Viewed by 4503
Abstract
The conditions for the appearance of the Little Rip, Pseudo Rip and Quasi Rip universes in the terms of the parameters in the equation of state of some dark fluid are investigated. Several examples of the Rip cosmologies are investigated. Full article
(This article belongs to the Special Issue Cosmology with Fluid Components)
194 KiB  
Article
Conformally Coupled Inflation
by Valerio Faraoni
Galaxies 2013, 1(2), 96-106; https://doi.org/10.3390/galaxies1020096 - 30 Jul 2013
Cited by 15 | Viewed by 4164
Abstract
A massive scalar field in a curved spacetime can propagate along the light cone, a causal pathology, which can, in principle, be eliminated only if the scalar couples conformally to the Ricci curvature of spacetime. This property mandates conformal coupling for the field [...] Read more.
A massive scalar field in a curved spacetime can propagate along the light cone, a causal pathology, which can, in principle, be eliminated only if the scalar couples conformally to the Ricci curvature of spacetime. This property mandates conformal coupling for the field driving inflation in the early universe. During slow-roll inflation, this coupling can cause super-acceleration and, as a signature, a blue spectrum of primordial gravitational waves. Full article
(This article belongs to the Special Issue Cosmology with Fluid Components)
253 KiB  
Article
Inhomogeneous Viscous Fluids in a Friedmann-Robertson-Walker (FRW) Universe
by Ratbay Myrzakulov, Lorenzo Sebastiani and Sergio Zerbini
Galaxies 2013, 1(2), 83-95; https://doi.org/10.3390/galaxies1020083 - 09 Jul 2013
Cited by 15 | Viewed by 4476
Abstract
We give a brief review of some aspects of inhomogeneous viscous fluids in a flat Friedmann-Robertson-Walker Universe. In general, it is pointed out that several fluid models may bring the future Universe evolution to become singular, with the appearance of the so-called Big [...] Read more.
We give a brief review of some aspects of inhomogeneous viscous fluids in a flat Friedmann-Robertson-Walker Universe. In general, it is pointed out that several fluid models may bring the future Universe evolution to become singular, with the appearance of the so-called Big Rip scenario. We investigate the effects of fluids coupled with dark matter in a de Sitter Universe, by considering several cases. Due to this coupling, the coincidence problem may be solved, and if the de Sitter solution is stable, the model is also protected against the Big Rip singularity. Full article
(This article belongs to the Special Issue Cosmology with Fluid Components)
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