Probing cosmological parameters with GRBs
Abstract
In light of the recent finding of the narrow clustering of the geometrically-corrected gamma-ray energies emitted by Gamma Ray Bursts (GRBs), we investigate the possibility to use these sources as standard candles to probe cosmological parameters such as the matter density Omegam and the cosmological constant energy density OmegaLambda. By simulating different samples of gamma-ray bursts, based on recent observational results, we find that Omegam (with the prior Omegam + OmegaLambda = 1) can be determined with accuracy ~7% with data from 300 GRBs, provided a local calibration of the standard candles be achieved.
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