Dynamical Dark Energy or Simply Cosmic Curvature?

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dc.creatorClarkson, Chris
dc.creatorCortes, Marina
dc.creatorBassett, Bruce A.
dc.date2007-02-26
dc.date2007-07-27
dc.date.accessioned2026-07-07T11:00:56Z
dc.date.available2026-07-07T11:00:56Z
dc.descriptionWe show that the assumption of a flat universe induces critically large errors in reconstructing the dark energy equation of state at z>~0.9 even if the true cosmic curvature is very small, O(1%) or less. The spuriously reconstructed w(z) shows a range of unusual behaviour, including crossing of the phantom divide and mimicking of standard tracking quintessence models. For 1% curvature and LCDM, the error in w grows rapidly above z~0.9 reaching (50%,100%) by redshifts of (2.5,2.9) respectively, due to the long cosmological lever arm. Interestingly, the w(z) reconstructed from distance data and Hubble rate measurements have opposite trends due to the asymmetric influence of the curved geodesics. These results show that including curvature as a free parameter is imperative in any future analyses attempting to pin down the dynamics of dark energy, especially at moderate or high redshifts.
dc.description5 pages, 2 figures. To appear in JCAP
dc.identifierhttps://arxiv.org/abs/astro-ph/0702670
dc.identifierhttp://arxiv.org/abs/astro-ph/0702670
dc.identifierJCAP0708:011,2007
dc.identifierdoi:10.1088/1475-7516/2007/08/011
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187810
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleDynamical Dark Energy or Simply Cosmic Curvature?
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