Advances on GRB as cosmological tools

TL;DR

This paper reviews recent correlations in Gamma Ray Bursts (GRBs) and discusses their potential as standard candles for cosmology, highlighting the updated E_peak-E_gamma correlation and challenges in standardization.

Contribution

It presents an updated E_peak-E_gamma correlation and discusses the limitations of current methods for standardizing GRB energetics for cosmological use.

Findings

Updated E_peak-E_gamma correlation presented

Less scattered correlations are more useful for cosmology

Challenges remain due to unexplained nature of many correlations

Abstract

Several interesting correlations among Gamma Ray Bursts (GRB) prompt and afterglow properties have been found in the recent years. Some of these correlations have been proposed also to standardize GRB energetics to use them as standard candles in constraining the expansion history of the universe up to z>6. However, given the still unexplained nature of most of these correlations, only the less scattered correlations can be used for constraining the cosmological parameters. The updated E_peak-E_gamma correlation is presented. Caveats of alternative methods of standardizing GRB energetics are discussed.