Tracing Dark Energy History with Gamma-Ray Bursts
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Observations of gamma-ray bursts up to z similar to 9 are best suited to study the possible evolution of the universe equation of state at intermediate redshifts. We apply the Combo relation to a sample of 174 gamma-ray bursts to investigate possible evidence of evolving dark energy parameter w(z). We first build a gamma-ray burst Hubble's diagram and then we estimate the set (omega(m), omega(?)) in the framework of flat and non-flat ?CDM paradigm. We then get bounds over the wCDM model, where w is thought to evolve with redshift, adopting two priors over the Hubble constant in tension at 4.4 sigma, i.e., H-0 = (67.4 0.5) km s(-1) Mpc(-1) and H-0 = (74.03 1.42) km s(-1) Mpc(-1). We show our new sample provides tighter constraints on omega(m) since at z = 1.2 the case w <-1 cannot be fully excluded, indicating that dark energy's influence is not negligible at larger z. We confirm the Combo relation as a powerful tool to investigate cosmological evolution of dark energy. Future space missions will significantly enrich the gamma-ray burst database even at smaller redshifts, improving de facto the results discussed in this paper.
Originalsprog | Engelsk |
---|---|
Artikelnummer | 181 |
Tidsskrift | Astrophysical Journal |
Vol/bind | 908 |
Udgave nummer | 2 |
Antal sider | 11 |
ISSN | 0004-637X |
DOI | |
Status | Udgivet - feb. 2021 |
Links
- https://arxiv.org/pdf/2012.03392.pdf
Indsendt manuskript
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