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Looking Beyond Lambda with the Union Supernova Compilation
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2009 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 695, 391-403 p.Article in journal (Refereed) Published
Abstract [en]

The recent robust and homogeneous analysis of the world's supernova distance-redshift data, together with cosmic microwave background and baryon acoustic oscillation data—provides a powerful tool for constraining cosmological models. Here we examine particular classes of scalar field, modified gravity, and phenomenological models to assess whether they are consistent with observations even when their behavior deviates from the cosmological constant Λ. Some models have tension with the data, while others survive only by approaching the cosmological constant, and a couple are statistically favored over Λ cold dark matter. Dark energy described by two equation-of-state parameters has considerable phase space to avoid Λ and next-generation data will be required to constrain such physics, with the level of complementarity between probes varying with cosmology.

Place, publisher, year, edition, pages
2009. Vol. 695, 391-403 p.
Keyword [en]
cosmology: observations, cosmology: theory, supernovae: general
National Category
Astronomy, Astrophysics and Cosmology
Research subject
URN: urn:nbn:se:su:diva-48740DOI: 10.1088/0004-637X/695/1/391ISI: 000264779500033OAI: diva2:375836
Available from: 2010-12-09 Created: 2010-12-09 Last updated: 2011-03-29Bibliographically approved

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Goobar, ArielNobili, Serena
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