Can Gamma-ray Bursts Help Constrain Cosmological Parameters?

Details Can Gamma-ray Bursts Help Constrain Cosmological Parameters? Can Gamma-ray Bursts Help Constrain Cosmological Parameters?

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.0605a&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #06.05; Bulletin of the American Astronomical Society, Vol. 34, p.650

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Although Gamma-ray bursts (GRBs) are observed to have a wide range of apparent burst energies, recent studies suggest that beaming significantly affects the observed fluxes. Correcting for this effect, Frail et al. (2001) find that GRBs have a common burst energy with a 1 σ multiplicative spread of 2.0. This is small enough to provide interesting constraints on the cosmological parameters Ω { M} and Ω Λ when combined with available type 1a supernovae data. GRBs are currently detected to much higher redshifts than supernovae, allowing improved tests of dust/dark energy models to be made. If GRBs are conclusively shown to be monoenergetic, they will provide a useful probe of cosmology at moderately high redshifts.

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