Gravitational energy as dark energy: Towards concordance cosmology without Lambda

Issue		EAS Publications Series Volume 36, 2009 Dark Energy and Dark Matter: Observations, Experiments and Theories


Page(s)		91 - 98
DOI		10.1051/eas/0936011
Published online		30 May 2009

Dark Energy and Dark Matter: Observations, Experiments and Theories
E. Pécontal, T. Buchert, Ph. Di Stefano and Y. Copin (eds)
EAS Publications Series, 36 (2009) 91-98
DOI: 10.1051/eas/0936011

Gravitational energy as dark energy: Towards concordance cosmology without Lambda

D.L. Wiltshire

Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand;

David.Wiltshire@canterbury.ac.nz

Published online: 30 May 2009

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.

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