Cosmography by GRBs : Gamma Ray Bursts as possible distance indicators

TL;DR

This paper proposes a new method combining gamma-ray bursts and supernovae to better constrain dark energy models and identify the universe's transition from deceleration to acceleration.

Contribution

It introduces a novel approach using GRBs calibrated by SNeIa as distance indicators to distinguish cosmological models at high redshift.

Findings

GRBs can serve as effective high-redshift distance indicators

The method constrains the dark energy equation of state

Potential to discriminate between cosmological models

Abstract

A new method to constrain the cosmological equation of state is proposed by using combined samples of gamma-ray bursts (GRBs) and supernovae (SNeIa). The Chevallier-Polarski-Linder parameterization is adopted for the equation of state in order to find out a realistic approach to achieve the deceleration/acceleration transition phase of dark energy models. As results, we find that GRBs, calibrated by SNeIa, could be, at least, good distance indicators capable of discriminating cosmological models with respect to $\Lambda$CDM at high redshift.