On the future of gamma-ray burst cosmology
E Mörtsell et al 2005 J. Cosmol. Astropart. Phys. JCAP06(2005)009
doi:10.1088/1475-7516/2005/06/009

E Mörtsell and J Sollerman
Department of Astronomy, Stockholm University, AlbaNova, 106 91 Stockholm, Sweden
E-mail: edvard@astro.su.se and jesper@astro.su.se

Abstract. With the understanding that the enigmatic gamma-ray bursts (GRBs) are beamed explosions, and with the recently discovered 'Ghirlanda relation', the dream of using GRBs as cosmological yardsticks may have come a few steps closer to reality. Assuming that the Ghirlanda relation is real, we have investigated possible constraints on cosmological parameters using a simulated future sample of a large number of GRBs inspired by the ongoing SWIFT mission. Comparing with constraints from a future sample of Type Ia supernovae, we find that GRBs are not efficient in constraining the amount of dark energy or its equation of state. The main reason for this is that very few bursts are available at low redshifts.

Controlled keywords: cosmological constant experiments, classical tests of cosmology

E-print number: astro-ph/0504245
Cited: by
Refers: to

Received 15 April 2005, accepted for publication 13 June 2005 Published 24 June 2005

http://www.iop.org/EJ/abstract/1475-7516/2005/06/009