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Universe 2017, 3(1), 22;

Cosmological Perturbations in Phantom Dark Energy Models

Departamento de Física, Universidade da Beira Interior, Rua Marquês D’Ávila e Bolama, 6200-001 Covilhã, Portugal
Centro de Matemática e Aplicações da, Universidade da Beira Interior, Rua Marquês D’Ávila e Bolama, 6200-001 Covilhã, Portugal
Department of Theoretical Physics, University of the Basque Country, UPV/EHU, P.O. Box 644, 48080 Bilbao, Spain
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)
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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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Albarran, I.; Bouhmadi-López, M.; Morais, J. Cosmological Perturbations in Phantom Dark Energy Models. Universe 2017, 3, 22.

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