Thawing quintessence with a nearly flat potential

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dc.creatorScherrer, Robert J.
dc.creatorSen, A. A.
dc.date2007-12-20
dc.date2008-04-02
dc.date.accessioned2026-07-07T11:39:35Z
dc.date.available2026-07-07T11:39:35Z
dc.descriptionThe thawing quintessence model with a nearly flat potential provides a natural mechanism to produce an equation of state parameter, w, close to -1 today. We examine the behavior of such models for the case in which the potential satisfies the slow roll conditions: [(1/V)(dV/dphi)]^2 << 1 and (1/V)(d^2 V/dphi^2) << 1, and we derive the analog of the slow-roll approximation for the case in which both matter and a scalar field contribute to the density. We show that in this limit, all such models converge to a unique relation between 1+w, Omega_phi, and the initial value of (1/V)(dV/dphi). We derive this relation, and use it to determine the corresponding expression for w(a), which depends only on the present-day values for w and Omega_phi. For a variety of potentials, our limiting expression for w(a) is typically accurate to within delta w < 0.005 for w<-0.9. For redshift z < 1, w(a) is well-fit by the Chevallier-Polarski-Linder parametrization, in which w(a) is a linear function of a.
dc.description8 pages, 5 figures, discussion added, references updated, typos corrected, to appear in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0712.3450
dc.identifierhttp://arxiv.org/abs/0712.3450
dc.identifierPhys.Rev.D77:083515,2008
dc.identifierdoi:10.1103/PhysRevD.77.083515
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199968
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleThawing quintessence with a nearly flat potential
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