Decaying Dark Energy in Higher-Dimensional Gravity

Details Decaying Dark Energy in Higher-Dimensional Gravity Decaying Dark Energy in Higher-Dimensional Gravity

2007-07-20

arxiv.org/abs/0707.3148v1

Astronomy & Astrophysics 473 (2007) 727-731

Astronomy and Astrophysics

Astrophysics

11 pages, 5 figures, submitted to A&A

Scientific paper

10.1051/0004-6361:20077670

We use data from observational cosmology to put constraints on higher-dimensional extensions of general relativity in which the effective four-dimensional dark-energy density (or cosmological "constant") decays with time. In particular we study the implications of this decaying dark energy for the age of the universe, large-scale structure formation, big-bang nucleosynthesis and the magnitude-redshift relation for Type Ia supernovae. Two of these tests (age and the magnitude-redshift relation) place modest lower limits on the free parameter of the theory, a cosmological length scale L akin to the de Sitter radius. These limits will improve if experimental uncertainties on supernova magnitudes can be reduced around z=1.

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