Phantom Dark Energy Models with a Nearly Flat Potential

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dc.creatorScherrer, Robert J.
dc.creatorSen, A. A.
dc.date2008-08-13
dc.date2008-09-11
dc.date.accessioned2026-07-07T11:45:30Z
dc.date.available2026-07-07T11:45:30Z
dc.descriptionWe examine phantom dark energy models produced by a field with a negative kinetic term and a potential that satisfies the slow roll conditions: [(1/V)(dV/dphi)]^2 << 1 and (1/V)(d^2 V/dphi^2) << 1. Such models provide a natural mechanism to produce an equation of state parameter, w, slightly less than -1 at present. Using techniques previously applied to quintessence, we show that in this limit, all such phantom models converge to a single expression for w(a), which is a function only of the present-day values of Omega_phi and w. This expression is identical to the corresponding behavior of w(a) for quintessence models in the same limit. At redshifts z < 1, this limiting behavior is well fit by the linear parametrization, w=w_0 + w_a(1-a), with w_a \approx -1.5(1+w_0).
dc.description4 pages, 2 figures, discussion added, to appear in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0808.1880
dc.identifierhttp://arxiv.org/abs/0808.1880
dc.identifierPhys.Rev.D78:067303,2008
dc.identifierdoi:10.1103/PhysRevD.78.067303
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/201898
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titlePhantom Dark Energy Models with a Nearly Flat Potential
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