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 Omega_m and the cosmological constant energy density Omega_Lambda. By simulating different samples of gamma-ray bursts, based on recent observational results, we find that Omega_m (with the prior Omega_m + Omega_Lambda = 1) can be determined with accuracy ~7% with data from 300 GRBs, provided a local calibration of the standard candles be achieved.
Keywords
Cite
@article{arxiv.astro-ph/0401244,
title = {Probing cosmological parameters with GRBs},
author = {T. Di Girolamo and M. Vietri and G. Di Sciascio},
journal= {arXiv preprint arXiv:astro-ph/0401244},
year = {2009}
}
Comments
4 pages, 2 figures, to appear in the Proceedings of the Conference "30 Years of GRB Discovery", Santa Fe, New Mexico, USA, September 8-12, 2003