GRB Cosmography with THESEUS

TL;DR

This paper discusses how the upcoming THESEUS mission will enhance the use of Gamma-ray Bursts as cosmological probes, enabling better constraints on the universe's expansion and dark energy evolution at high redshift.

Contribution

It demonstrates the potential of THESEUS to significantly improve cosmological parameter measurements using GRBs and explore dark energy evolution.

Findings

Improved accuracy in cosmological parameters with 800 GRBs

Enhanced ability to constrain dark energy equation of state

GRBs as independent probes of universe expansion

Abstract

Gamma-ray Bursts can be used as distance indicators using the Combo relation. We show how the proposed THESEUS mission will allow us to investigate the evolution history of the Universe at high redshift with GRBs. Assuming that THESEUS will measure the redshift for 800 GRBs, we show that the accuracy on the cosmological parameters of the main cosmological models will greatly improve, so that we can use GRBs as additional and independent cosmological probes and also put strong constraints on the evolution of the dark energy equation of state parameter $w(z)$.