Can we be tricked into thinking that w is less than -1?

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dc.creatorCarroll, Sean M.
dc.creatorDe Felice, Antonio
dc.creatorTrodden, Mark
dc.date2004-08-04
dc.date2004-09-28
dc.date.accessioned2026-07-07T11:29:25Z
dc.date.available2026-07-07T11:29:25Z
dc.descriptionDark energy candidates for which the equation-of-state parameter w is less than -1 violate the dominant energy condition, and are typically unstable. In scalar-tensor theories of gravity, however, the expansion of the universe can mimic the behavior of general relativity with w<-1 dark energy, without violating any energy conditions. We examine whether this possibility is phenomenologically viable by studying Brans-Dicke models and characterizing both the naturalness of the models themselves, and additional observational constraints from limits on the time-dependence of Newton's constant. We find that only highly contrived models would lead observers to measure w<-1.
dc.description20 pages, 4 figures, uses RevTeX
dc.identifierhttps://arxiv.org/abs/astro-ph/0408081
dc.identifierhttp://arxiv.org/abs/astro-ph/0408081
dc.identifierPhys.Rev.D71:023525,2005
dc.identifierdoi:10.1103/PhysRevD.71.023525
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196709
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleCan we be tricked into thinking that w is less than -1?
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