On the future of Gamma-Ray Burst Cosmology

Details On the future of Gamma-Ray Burst Cosmology On the future of Gamma-Ray Burst Cosmology

2005-04-11

arxiv.org/abs/astro-ph/0504245v3

JCAP 0506:009,2005

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, matches version accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2005/06/009

With the understanding that the enigmatic Gamma-Ray Burts (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 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.

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