Measuring Ω_M and Ω_Λ with long-duration gamma-ray bursts

Details Measuring Ω_M and Ω_Λ with long-duration gamma-ray bursts Measuring Ω_M and Ω_Λ with long-duration gamma-ray bursts

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010an....331..837b&link_type=abstract

Astronomische Nachrichten, Vol.331, Issue 8, p.837

Mathematics

Logic

Cosmological Parameters, Gamma-Rays: Bursts

Scientific paper

Gamma-ray bursts (GRBs) are one of the most luminous events in the Universe. In addition, the Universe itself is almost transparent to γ-rays, making GRBs detectable up to very high redshifts. As a result, GRBs are very suitable to probe the cosmological parameters. This work shows the potential of long-duration GRBs for measuring the cosmological parameters Ω_M and Ω_Λ by comparing the observed log N-log P distribution with the theoretical one. Provided that the GRBs rate and luminosity function are well determined, the best values and 1σ confidence intervals obtained are Ω_M=0.22+0.05-0.03 and Ω_Λ=1.06+0.05-0.10. Finally, a set of simulations show the ability of the method to measure Ω_M and Ω_Λ.

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