Constraining Lambda CDM and Brane-based Cosmologies using Gamma Ray Burst

Details Constraining Lambda CDM and Brane-based Cosmologies using Gamma Ray Burst Constraining Lambda CDM and Brane-based Cosmologies using Gamma Ray Burst

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9101b&link_type=abstract

American Astronomical Society, AAS Meeting #211, #91.01; Bulletin of the American Astronomical Society, Vol. 39, p.883

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It has recently become possible to use gamma ray bursts as cosmological tracers, exploiting correlations between their spectral peak, light curve break time, and apparent isotropic energy (the Ghirlanda and Amati relations). We are using these correlations to compare a standard Lambda CDM cosmology to a cosmology motivated by brane models, where the cosmic acceleration is a purely geometric effect and not a consequence of dark energy. Deffayet et al (2002) have examined this comparison using supernova Ia data, which are compatible with both models. The larger redshift range spanned by GRBs provides additional leverage, allowing us to constrain either model better and potentially also to distinguish between them. We discuss both the results from the currently available sample of 15 GRBs and the prospects for improved constraints from much larger samples in future.

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