Measuring cosmological parameters with Gamma-Ray Bursts
Abstract
In a few dozen seconds gamma ray bursts (GRBs) emit up to 10^54 erg in terms of an equivalent isotropically radiated energy Eiso, so they can be observed up to z ~10. Thus, these phenomena appear to be very promising tools to describe the expansion rate history of the universe. Here we review the use of the Ep,i - Eiso correlation of GRBs to measure the cosmological density parameter Omega_M. We show that the present data set of Gamma-Ray Bursts, coupled with the assumption that we live in a flat universe, can provide independent evidence, from other probes, that Omega_M ~0.3. We show that current (e.g., Swift, Fermi/GBM, Konus-WIND) and forthcoming GRB experiments (e.g., CALET/GBM, SVOM, Lomonosov/UFFO, LOFT/WFM) will allow us to constrain Omega_M with an accuracy comparable to that currently exhibited by Type Ia supernovae and to study the properties of dark energy and their evolution with time.
Cite
@article{arxiv.1310.3141,
title = {Measuring cosmological parameters with Gamma-Ray Bursts},
author = {Lorenzo Amati and Massimo Della Valle},
journal= {arXiv preprint arXiv:1310.3141},
year = {2013}
}
Comments
13 pages, 7 figures, International Journal of Modern Physics D, in press