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    Decaying dark energy in higher-dimensional gravity

    Overduin, James M.
    Wesson, Paul S.
    Mashhoon, Bahram
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    [PDF] DecayingDarkEnergyHigher.pdf (160.8Kb)
    Date
    2007
    Format
    Article
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    Abstract
    Aims. 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. Methods. 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. Results. 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.
    URI
    http://hdl.handle.net/10355/8253
    Citation
    A&A 473, 727-731 (2007)
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    • Physics and Astronomy publications (MU)

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