Constraints on cosmological parameters from gamma-ray burst peak photon energy and bolometric fluence measurements and other data

TL;DR

This study uses gamma-ray burst measurements across a wide redshift range to constrain cosmological parameters and validate the Amati relation's consistency across different models, though with less precision than other methods.

Contribution

It demonstrates the robustness of the Amati relation across multiple cosmological models and provides independent constraints on cosmological parameters using GRB data.

Findings

Amati relation parameters are consistent across six cosmological models.

GRB data constraints are compatible with other cosmological measurements.

GRB data provide less restrictive but independent cosmological constraints.

Abstract

We use measurements of the peak photon energy and bolometric fluence of 119 gamma-ray bursts (GRBs) extending over the redshift range of $0.3399 \leq z \leq 8.2$ to simultaneously determine cosmological and Amati relation parameters in six different cosmological models. The resulting Amati relation parameters are almost identical in all six cosmological models, thus validating the use of the Amati relation in standardizing these GRBs. The GRB data cosmological parameter constraints are consistent with, but significantly less restrictive than, those obtained from a joint analysis of baryon acoustic oscillation and Hubble parameter measurements.