Cosmic acceleration and extra dimensions: constraints on modifications of the Friedmann equation |
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Authors: | Øystein Elgarøy Tuomas Multamäki |
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Institution: | Institute of theoretical astrophysics, University of Oslo, Box 1029, 0315 Oslo, Norway;NORDITA, Blegdamsvej 17, DK-2100 Copenhagen, Denmark |
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Abstract: | An alternative to dark energy as an explanation for the present phase of accelerated expansion of the Universe is that the Friedmann equation is modified, e.g. by extra dimensional gravity, on large scales. We explore a natural parametrization of a general modified Friedmann equation, and find that the present supernova Type Ia and cosmic microwave background data prefer a correction of the form 1/ H to the Friedmann equation over a cosmological constant. |
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Keywords: | cosmological parameters cosmology: observations cosmology: theory |
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