A Cosmology-Independent Gamma-Ray Burst Hubble Diagram

Details A Cosmology-Independent Gamma-Ray Burst Hubble Diagram A Cosmology-Independent Gamma-Ray Burst Hubble Diagram

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21011506s&link_type=abstract

American Astronomical Society Meeting 210, #115.06; Bulletin of the American Astronomical Society, Vol. 39, p.241

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Scientific paper

The current Gamma-Ray Burst (GRB) Hubble Diagram (HD) has 69 bursts with 0.17 < z < 6.6. The 1-sigma scatter of these 69 GRB about the model HD for the concordance cosmology is 0.6 mag in the distance modulus, with this only being a factor of two worse than that for the gold sample of Type Ia supernovae. The 18 bursts from 31.7 bursts. Thus, the GRB HD can be presented in a model independent form. I also combine the model-independent GRB HD with the 182 Type Ia supernovae in the latest gold sample. I find that the reduced chi-square for the concordance cosmology (a flat Universe with Omega=0.27 and the unchanging cosmological constant) is near unity and not significantly worse than the best fit model.

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