Journal Article

Gamma-ray burst distances and the timescape cosmology

Peter R. Smale

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 418, issue 4, pages 2779-2784
Published in print December 2011 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI:
Gamma-ray burst distances and the timescape cosmology

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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 GRB analysis of Schaefer, with the aim of distinguishing the timescape cosmological model from the Λ cold dark matter (ΛCDM) model by means of the additional leverage provided by Gamma-ray bursts (GRBs) in the range 2 ≲z≲ 7. We find that the timescape model fits the GRB sample slightly better than the ΛCDM model, but that the systematic uncertainties are still too little understood to distinguish the models.

Keywords: cosmological parameters; cosmology: observations; cosmology: theory

Journal Article.  4505 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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