Prospects of high redshift constraints on dark energy models with the Ep, i − Eiso correlation in long gamma ray bursts
Date Issued
2021
Author(s)
Description
LA acknowledges support by the Italian Ministry for Education, University, and Research through PRIN MIUR 2009 project on ‘Gamma ray bursts: from progenitors to the physics of the prompt emission process.’ (Prot. 2009 ERC3HT).
Abstract
So far large and different data sets revealed the accelerated expansion rate of the Universe, which is usually explained in terms of dark energy. The nature of dark energy is not yet known, and several models have been introduced: a non-zero cosmological constant, a potential energy of some scalar field, effects related to the non-homogeneous distribution of matter, or effects due to alternative theories of gravity. Recently, a tension with the flat ΛCDM model has been discovered using a high-redshift Hubble diagram of supernovae, quasars, and gamma-ray bursts (GRB). Here we use the Union2 type Ia supernovae and GRB Hubble diagram, and a set of direct measurements of the Hubble parameter to explore different dark energy models. We use the Chevallier–Polarski–Linder parametrization of the dark energy equation of state, a minimally coupled quintessence scalar field, and, finally, we consider models with dark energy at early times. We perform a statistical analysis based on the Markov chain Monte Carlo method, and explore the probability distributions of the cosmological parameters for each of the competing models. We apply the Akaike Information Criterion to compare these models: our analysis indicates that an evolving dark energy, described by a scalar field with exponential potential seems to be favoured by observational data.
Volume
506
Issue
1
Start page
903
Issn Identifier
0035-8711
Ads BibCode
2021MNRAS.506..903D
Rights
open.access
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