Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-09-08
Mon. Not. Royal Astr. Soc. (2010) 405, 2231
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
12 pages, 14 figures, typos corrected, matches the version published in MNRAS. DOI added
Scientific paper
10.1111/j.1365-2966.2010.16627.x
Dark energy observations may be explained within general relativity using an inhomogeneous Hubble-scale depression in the matter density and accompanying curvature, which evolves naturally out of an Einstein-de Sitter (EdS) model. We present a simple parameterization of a void which can reproduce concordance model distances to arbitrary accuracy, but can parameterize away from this to give a smooth density profile everywhere. We show how the Hubble constant is not just a nuisance parameter in inhomogeneous models because it affects the shape of the distance-redshift relation. Independent Hubble-rate data from age estimates can in principle serve to break the degeneracy between concordance and void models, but the data is not yet able to achieve this. Using the latest Constitution supernova dataset we show that robust limits can be placed on the size of a void which is roughly independent of its shape. However, the sharpness of the profile at the origin cannot be well constrained due to supernova being dominated by peculiar velocities in the local Universe. We illustrate our results using some recently proposed diagnostics for the Friedmann models.
Clarkson Chris
February Sean
Larena Julien
Smith Mathew
No associations
LandOfFree
Rendering Dark Energy Void does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Rendering Dark Energy Void, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rendering Dark Energy Void will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-108415