Quintessence and tachyon dark energy models with a constant equation of state parameter

Avelino, P. P.; Losano, L.; Rodrigues, J. J.

doi:10.1016/j.physletb.2011.03.048

Cited by 27 publications

(26 citation statements)

References 33 publications

(28 reference statements)

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“…For simplicity, we start by assuming that the DE is characterized by a time-independent w (see Refs. [32,33] for a discussion of quintessence and tachyon DE models with a constant equation-of-state parameter). In this case…”

Section: B Inhomogeneous Dark Energymentioning

confidence: 99%

Generalized Layzer-Irvine equation: The role of dark energy perturbations in cosmic structure formation

Avelino

Gomes

2013

Phys. Rev. D

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We derive, using the spherical collapse model, a generalized Layzer-Irvine equation which can be used to describe the gravitational collapse of cold dark matter in a dark energy background. We show that the usual Layzer-Irvine equation is valid if the dark matter and the dark energy are minimally coupled to each other and the dark energy distribution is homogeneous, independently of its equation of state. We compute the corrections to the standard Layzer-Irvine equation which arise in the presence of dark energy inhomogeneities assuming a minimal coupling between dark matter and dark energy. We show that, in the case of a dark energy component with a constant equation-of-state parameter consistent with the latest observational constraints, these corrections are expected to be small, even if the dark energy has a negligible sound speed. However, we find that, in more general models, the impact of dark energy perturbations on the dynamics of clusters of galaxies, which will be constrained by ESA's Euclid mission with unprecedented precision, might be significant.

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Section: B Inhomogeneous Dark Energymentioning

confidence: 99%

Generalized Layzer-Irvine equation: The role of dark energy perturbations in cosmic structure formation

Avelino

Gomes

2013

Phys. Rev. D

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“…The Chaplygin gas type equation of state is frequently studied in the literature and used to describe standard matter and dark energy as a single fluid [8,9,10,11,12,13,14]. Such equations of state can be generated by a standard scalar field with a specific potential [8,15] or a tachyon scalar field [16], which can be also applied in various other contexts [17,18,19].…”

Section: Introductionmentioning

confidence: 99%

The van der Waals fluid and its role in cosmology

Jantsch

Christmann

Kremer

2016

Int. J. Mod. Phys. D

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We analyze the properties of a generic cosmological fluid described by the van der Waals equation of state. Exact solutions for the energy density evolution are found as implicit functions of the scale factor for a flat Friedmann-Robertson-Walker space-time. The possible values of the free parameter in the van der Waals equation are selected a posteriori, in accordance with asymptotic behaviors that are physically relevant. The stability of the model against small perturbations is studied through the hydrodynamic perturbations of the fluid for the relevant cases. It is found that a van der Waals fluid seems appropriate to describe non-eternal inflationary scenarios.

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“…Hence, the ΛCDM scenario can be regarded as the simplest example of a UDE realization where the role of DM and DE are played by the same dark fluid [10]. Various other interesting candidates for the unification of DM and DE have been proposed in the literature, including the Chaplygin gas and its variations [11][12][13], tachyon field models [14][15][16][17][18][19][20], and a large variety of interacting dark energy (IDE) models [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Chaplygin gas cosmologies

2014

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We study the nonlinear regime of unified dark energy models, using generalized Chaplygin gas cosmologies as a representative example, and introduce a new parameter characterizing the level of small scale clustering in these scenarios. We show that viable generalized Chaplygin gas cosmologies, consistent with the most recent observational constraints, may be constructed for any value of the generalized Chaplygin gas parameter by considering models with a sufficiently high level of nonlinear clustering.

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Quintessence and tachyon dark energy models with a constant equation of state parameter

Cited by 27 publications

References 33 publications

Generalized Layzer-Irvine equation: The role of dark energy perturbations in cosmic structure formation

Generalized Layzer-Irvine equation: The role of dark energy perturbations in cosmic structure formation

The van der Waals fluid and its role in cosmology

Nonlinear Chaplygin gas cosmologies

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