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Universe 2017, 3(1), 22; doi:10.3390/universe3010022

Cosmological Perturbations in Phantom Dark Energy Models

1
Departamento de Física, Universidade da Beira Interior, Rua Marquês D’Ávila e Bolama, 6200-001 Covilhã, Portugal
2
Centro de Matemática e Aplicações da, Universidade da Beira Interior, Rua Marquês D’Ávila e Bolama, 6200-001 Covilhã, Portugal
3
Department of Theoretical Physics, University of the Basque Country, UPV/EHU, P.O. Box 644, 48080 Bilbao, Spain
4
Ikerbasque, Basque Foundation for Science, 48011 Bilbao, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Mariusz P. Dąbrowski, Manuel Krämer and Vincenzo Salzano
Received: 27 January 2017 / Revised: 24 February 2017 / Accepted: 26 February 2017 / Published: 6 March 2017
(This article belongs to the Special Issue Varying Constants and Fundamental Cosmology)
View Full-Text   |   Download PDF [1066 KB, uploaded 6 March 2017]   |  

Abstract

The ΛCDM paradigm, characterised by a constant equation of state w = 1 for dark energy, is the model that better fits observations. However, the same observations strongly support the possibility of a dark energy content where the corresponding equation of state is close to but slightly smaller than 1 . In this regard, we focus on three different models where the dark energy content is described by a perfect fluid with an equation of state w 1 which can evolve or not. The three proposals show very similar behaviour at present, while the asymptotic evolution of each model drives the Universe to different abrupt events known as (i) Big Rip; (ii) Little Rip (LR); and (iii) Little Sibling of the Big Rip. With the aim of comparing these models and finding possible imprints in their predicted matter distribution, we compute the matter power spectrum and the growth rate f σ 8 . We conclude that the model which induces a LR seems to be favoured by observations. View Full-Text
Keywords: dark energy; cosmological perturbations; cosmic singularities dark energy; cosmological perturbations; cosmic singularities
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Albarran, I.; Bouhmadi-López, M.; Morais, J. Cosmological Perturbations in Phantom Dark Energy Models. Universe 2017, 3, 22.

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