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Gravitational energy as dark energy: Towards concordance cosmologywithout Lambda

Published online by Cambridge University Press:  30 May 2009

E. Pécontal ,
T. Buchert ,
Ph. Di Stefano ,
Y. Copin  and
D.L. Wiltshire
D.L. Wiltshire*
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
*
David.Wiltshire@canterbury.ac.nz
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Abstract

I briefly outline a new physical interpretation to the average cosmological parameters for an inhomogeneous universe with backreaction. The variance in local geometry and gravitational energy between ideal isotropic observers in bound structures and isotropic observers at the volume average location in voids plays a crucial role. Fits of a model universe to observational data suggest the possibility of a new concordance cosmology, in which dark energy is revealed as a mis-identification of gravitational energy gradients that become important when voids grow at late epochs.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 36: Dark Energy and Dark Matter: Observations, Experiments and Theories , 2009 , pp. 91 - 98
Copyright
© EAS, EDP Sciences, 2009

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