Gamma-ray burst distances and the timescape cosmology

Authors

  • Peter R. Smale

    Corresponding author
    1. Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
      E-mail: peter.smale@pg.canterbury.ac.nz
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E-mail: peter.smale@pg.canterbury.ac.nz

ABSTRACT

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.

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