Affine equation of state from quintessence and k-essence fields

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dc.creatorQuercellini, Claudia
dc.creatorBruni, Marco
dc.creatorBalbi, Amedeo
dc.date2007-06-25
dc.date2007-09-05
dc.date.accessioned2026-07-07T10:56:25Z
dc.date.available2026-07-07T10:56:25Z
dc.descriptionWe explore the possibility that a scalar field with appropriate Lagrangian can mimic a perfect fluid with an affine barotropic equation of state. The latter can be thought of as a generic cosmological dark component evolving as an effective cosmological constant plus a generalized dark matter. As such, it can be used as a simple, phenomenological model for either dark energy or unified dark matter. Furthermore, it can approximate (up to first order in the energy density) any barotropic dark fluid with arbitrary equation of state. We find that two kinds of Lagrangian for the scalar field can reproduce the desired behaviour: a quintessence-like with a hyperbolic potential, or a purely kinetic k-essence one. We discuss the behaviour of these two classes of models from the point of view of the cosmological background, and we give some hints on their possible clustering properties.
dc.description9 pages, 6 figures. Minor updates, accepted by CQG
dc.identifierhttps://arxiv.org/abs/0706.3667
dc.identifierhttp://arxiv.org/abs/0706.3667
dc.identifierClass.Quant.Grav.24:5413-5426,2007
dc.identifierdoi:10.1088/0264-9381/24/22/006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/186407
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleAffine equation of state from quintessence and k-essence fields
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