Everpresent Lambda

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dc.creatorAhmed, Maqbool
dc.creatorDodelson, Scott
dc.creatorGreene, Patrick B.
dc.creatorSorkin, Rafael
dc.date2002-09-13
dc.date.accessioned2026-07-07T10:31:23Z
dc.date.available2026-07-07T10:31:23Z
dc.descriptionA variety of observations indicate that the universe is dominated by dark energy with negative pressure, one possibility for which is a cosmological constant. If the dark energy is a cosmological constant, a fundamental question is: Why has it become relevant at so late an epoch, making today the only time in the history of the universe at which the cosmological constant is of order the ambient density. We explore an answer to this question drawing on ideas from unimodular gravity, which predicts fluctuations in the cosmological constant, and causal set theory, which predicts the magnitude of these fluctuations. The resulting ansatz yields a fluctuating cosmological ``constant'' which is always of order the ambient density.
dc.description10 pages, 4 figures, LaTeX
dc.identifierhttps://arxiv.org/abs/astro-ph/0209274
dc.identifierhttp://arxiv.org/abs/astro-ph/0209274
dc.identifierPhys.Rev.D69:103523,2004
dc.identifierdoi:10.1103/PhysRevD.69.103523
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178394
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleEverpresent Lambda
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