Gamma ray burst distances and the timescape cosmology

Details Gamma ray burst distances and the timescape cosmology Gamma ray burst distances and the timescape cosmology

2011-07-27

arxiv.org/abs/1107.5596v2

Mon. Not. R. Astron. Soc. 418 (2011) 2779-2784

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 7 figures, revised version accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2011.19678.x

Gamma ray bursts can potentially be used as distance indicators, providing the possibility of extending the Hubble diagram to redshifts ~7. Here we follow the analysis of Schaefer (2007), with the aim of distinguishing the timescape cosmological model from the \LambdaCDM model by means of the additional leverage provided by GRBs in the range 2 < z < 7. We find that the timescape model fits the GRB sample slightly better than the \LambdaCDM model, but that the systematic uncertainties are still too little understood to distinguish the models.

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