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Title: Gravitational energy as dark energy: concordance of cosmological tests
Authors: Leith, B.M.
Cindy Ng, S.C. 
Wiltshire, D.L.
Keywords: Cosmological parameters
Cosmology: Observations
Cosmology: Theory
Dark matter large-scale structure of universe
Issue Date: 2008
Citation: Leith, B.M., Cindy Ng, S.C., Wiltshire, D.L. (2008). Gravitational energy as dark energy: concordance of cosmological tests. Astrophysical Journal 672 (2 PART 2) : L91-L94. ScholarBank@NUS Repository.
Abstract: We provide preliminary quantitative evidence that a new solution to averaging the observed inhomogeneous structure of matter in the universe may lead to an observationally viable cosmology without exotic dark energy. We find parameters which simultaneously satisfy three independent tests: the match to the angular scale of the sound horizon detected in the cosmic microwave background anisotropy spectrum; the effective comoving baryon acoustic oscillation scale detected in galaxy clustering statistics; and Type Ia supernova luminosity distances. Independently of the supernova data, concordance is obtained for a value of the Hubble constant which agrees with the measurement of the Hubble Key team of Sandage and coworkers. Best-fit parameters include a global average Hubble constant Ho = 61.7 +1.2 -1.1 km s-1 Mpc-1, a present epoch void volume fraction of fvo = 0.76+0.12 -0.09, and an age of the universe of 14.7+0.7 -0.5 billion years as measured by observers in galaxies. The mass ratio of nonbaryonic dark matter to baryonic matter is 3.1+2.3 -2.4, computed with a baryon-to-photon ratio that is in concordance with primordial lithium abundances. © 2008. The American Astronomical Society. All rights reserved. Printed in U.S.A.
Source Title: Astrophysical Journal
ISSN: 0004637
DOI: 10.1086/527034
Appears in Collections:Staff Publications

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