STARS2017 - 4th Caribbean Symposium on Cosmology, Gravitation, Nuclear and Astroparticle Physics / SMFNS2017 - 5th International Symposium on Strong Electromagnetic Fields and Neutron Stars

Measuring $\Omega_M$ with gamma-ray bursts

11 May 2017, 16:00

30m

Talk STARS2017

Speaker

Massimo Della Valle (Capodimonte Astronomical Observatory - INAF, Naples, Italy)

Description

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 GRBs, coupled with the assumption that we live in a flat universe, can provide independent evidence, from Supernovae-Ia, that $\Omega_M \sim 0.3$. We show that current (e.g. Swift, Fermi/GBM, Konus-WIND) and forthcoming gamma ray burst (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 (SNe-Ia) and to study the properties of dark energy and their evolution with time.