Gravitational energy as dark energy: Towards concordance cosmology without Lambda

Details Gravitational energy as dark energy: Towards concordance cosmology without Lambda Gravitational energy as dark energy: Towards concordance cosmology without Lambda

2009-12-29

arxiv.org/abs/0912.5234v1

EAS Publ.Ser.36:91-98,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 1 figure; in E. Pecontal, T. Buchert, Ph. Di Stefano and Y. Copin (eds), "Dark Energy and Dark Matter: Observations,

Scientific paper

10.1051/eas/0936011

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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