Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/30660
Title: | Addressing the circularity problem in the Ep-Eiso correlation of gamma-ray bursts | Authors: | AMATI, LORENZO D'Agostino, Rocco Luongo, Orlando Muccino, Marco TANTALO, MARIA |
Issue Date: | 2019 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. LETTERS | Number: | 486 | Issue: | 1 | First Page: | L46 | Abstract: | We here propose a new model-independent technique to overcome the circularity problem affecting the use of gamma-ray bursts (GRBs) as distance indicators through the use of Ep-Eiso correlation. We calibrate the Ep-Eiso correlation and find the GRB distance moduli that can be used to constrain dark energy models. We use observational Hubble data to approximate the cosmic evolution through Bézier parametric curve obtained through the linear combination of Bernstein basis polynomials. In doing so, we build up a new data set consisting of 193 GRB distance moduli. We combine this sample with the supernova JLA data set to test the standard ΛCDM model and its wCDM extension. We place observational constraints on the cosmological parameters through Markov Chain Monte Carlo numerical technique. Moreover, we compare the theoretical scenarios by performing the Akaike and Deviance Information statistical criteria.the 2σ level, while for the wCDM model we obtain Ω _m=0.34^{+0.13}_{-0.15} and w=-0.86^{+0.36}_{-0.38} at the 2σ level. Our analysis suggests that ΛCDM model is statistically favoured over the wCDM scenario. No evidence for extension of the ΛCDM model is found. | Acknowledgments: | L.A. acknowledges financial contribution from the agreement ASI-INAF n.2017-14-H.O. | URI: | http://hdl.handle.net/20.500.12386/30660 | URL: | https://arxiv.org/pdf/1811.08934.pdf https://academic.oup.com/mnrasl/article-abstract/486/1/L46/5481031?redirectedFrom=fulltext |
ISSN: | 1745-3925 | DOI: | 10.1093/mnrasl/slz056 | Bibcode ADS: | 2019MNRAS.486L..46A | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
1811.08934(1).pdf | preprint | 467.65 kB | Adobe PDF | View/Open |
slz056.pdf | PDF editoriale | 521.72 kB | Adobe PDF | View/Open |
Page view(s)
77
checked on Mar 29, 2024
Download(s)
77
checked on Mar 29, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.