On the future of gamma-ray burst cosmology
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.
- Publication:
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Journal of Cosmology and Astroparticle Physics
- Pub Date:
- June 2005
- DOI:
- 10.1088/1475-7516/2005/06/009
- arXiv:
- arXiv:astro-ph/0504245
- Bibcode:
- 2005JCAP...06..009M
- Keywords:
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- Astrophysics
- E-Print:
- 5 pages, 2 figures, matches version accepted for publication in JCAP