Are dark energy models with variable EoS parameter w compatible with the late inhomogeneous Universe?

Özgür Akarsu, Mariam Bouhmadi-López, Maxim Brilenkov, Ruslan Brilenkov, Maxim Eingorn, Alexander Zhuk

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We study the late-time evolution of the Universe where dark energy (DE) is presented by a barotropic fluid on top of cold dark matter (CDM) . We also take into account the radiation content of the Universe. Here by the late stage of the evolution we refer to the epoch where CDM is already clustered into inhomogeneously distributed discrete structures (galaxies, groups and clusters of galaxies). Under this condition the mechanical approach is an adequate tool to study the Universe deep inside the cell of uniformity. More precisely, we study scalar perturbations of the FLRW metric due to inhomogeneities of CDM as well as fluctuations of radiation and DE. For an arbitrary equation of state for DE we obtain a system of equations for the scalar perturbations within the mechanical approach. First, in the case of a constant DE equation of state parameter w, we demonstrate that our method singles out the cosmological constant as the only viable dark energy candidate. Then, we apply our approach to variable equation of state parameters in the form of three different linear parametrizations of w, e.g., the Chevallier-Polarski-Linder perfect fluid model. We conclude that all these models are incompatible with the theory of scalar perturbations in the late Universe.

Original languageEnglish
Article number038
JournalJournal of Cosmology and Astroparticle Physics
Volume2015
Issue number7
DOIs
Publication statusPublished - 1 Jul 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 IOP Publishing Ltd and Sissa Medialab srl .

Funding

FundersFunder number
National Aeronautics and Space AdministrationNNX09AV07A
National Science Foundation
Directorate for Education and Human Resources1345219

    Keywords

    • cosmological perturbation theory
    • dark energy theory

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