Gamma-ray burst distances and the timescape cosmology

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 o...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2011-12, Vol.418 (4), p.2779-2784
Main Author: Smale, Peter R.
Format: Article
Language:English
Subjects:
Astronomy
Cold dark matter
cosmological parameters
Cosmology
cosmology: observations
cosmology: theory
Dark matter
Earth, ocean, space
Exact sciences and technology
Gamma ray bursts
Gamma rays
Hubble diagram
Indicators
Red shift
Uncertainty
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Summary: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.
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2011.19678.x