Cosmography by GRBs

TL;DR

This paper uses gamma-ray burst relations to estimate cosmographic parameters of the universe at medium-high redshifts, showing consistency with the standard Lambda-CDM model when calibrated with supernova data.

Contribution

It introduces a method to derive cosmographic parameters from GRB data and compares results with other cosmological approaches.

Findings

GRBs can serve as reliable distance indicators when calibrated with SNeIa.

Derived cosmographic parameters agree with the Lambda-CDM model.

The method extends cosmography to higher redshifts using GRBs.

Abstract

Relations connecting gamma ray burst quantities can be used to constrain cosmographic parameters of the Hubble law at medium-high redshifts. We consider a sample of 27 gamma ray bursts to construct the luminosity distance to redshift relation and derive the values of the parameters $q_0$, $j_0$, and $s_0$. The analysis is compared with other methods in the literature. gamma gay bursts, if calibrated by SNeIa, seem reliable as distance indicators and give cosmographic parameters in agreement with the $\Lambda$CDM model.