Next Issue
Previous Issue

Table of Contents

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

  • Issues are regarded as officially published after their release is announced to the table of contents alert mailing list.
  • You may sign up for e-mail alerts to receive table of contents of newly released issues.
  • PDF is the official format for papers published in both, html and pdf forms. To view the papers in pdf format, click on the "PDF Full-text" link, and use the free Adobe Readerexternal link to open them.
View options order results:
result details:
Displaying articles 1-3
Export citation of selected articles as:

Research

Jump to: Review

Open AccessArticle Inhomogeneous Viscous Fluids in a Friedmann-Robertson-Walker (FRW) Universe
Galaxies 2013, 1(2), 83-95; doi:10.3390/galaxies1020083
Received: 20 May 2013 / Revised: 26 June 2013 / Accepted: 27 June 2013 / Published: 9 July 2013
Cited by 6 | PDF Full-text (253 KB) | HTML Full-text | XML Full-text
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)
Open AccessArticle Conformally Coupled Inflation
Galaxies 2013, 1(2), 96-106; doi:10.3390/galaxies1020096
Received: 29 June 2013 / Revised: 19 July 2013 / Accepted: 19 July 2013 / Published: 30 July 2013
Cited by 1 | PDF Full-text (194 KB) | HTML Full-text | XML Full-text
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)

Review

Jump to: Research

Open AccessReview Rip Cosmology via Inhomogeneous Fluid
Galaxies 2013, 1(2), 107-113; doi:10.3390/galaxies1020107
Received: 31 July 2013 / Revised: 10 August 2013 / Accepted: 12 August 2013 / Published: 15 August 2013
Cited by 1 | PDF Full-text (206 KB) | HTML Full-text | XML Full-text
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)

Journal Contact

MDPI AG
Galaxies Editorial Office
St. Alban-Anlage 66, 4052 Basel, Switzerland
galaxies@mdpi.com
Tel. +41 61 683 77 34
Fax: +41 61 302 89 18
Editorial Board
Contact Details Submit to Galaxies
Back to Top