Observational constraints to a unified cosmological model

We propose a phenomenological unified model (UM) for dark matter and dark energy based on an equation of state parameter w that scales with the of the redshift. The free parameters of the model are three constants: Ωb0, α and β. Parameter α dictates the transition rate between the matter dominated...

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Principais autores: Medeiros, Léo Gouvêa, Cuzinatto, R.R., Morais, Eduardo Messias de
Formato: article
Idioma:English
Publicado em: Elsevier
Assuntos:
Unified dark components
Primordial nucleosynthesis
SNIa
GRB
BAO
Endereço do item:https://repositorio.ufrn.br/jspui/handle/123456789/29905
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spelling ri-123456789-299052022-12-15T21:48:31Z Observational constraints to a unified cosmological model Medeiros, Léo Gouvêa Cuzinatto, R.R. Morais, Eduardo Messias de Unified dark components Primordial nucleosynthesis SNIa GRB BAO We propose a phenomenological unified model (UM) for dark matter and dark energy based on an equation of state parameter w that scales with the of the redshift. The free parameters of the model are three constants: Ωb0, α and β. Parameter α dictates the transition rate between the matter dominated era and the accelerated expansion period. The ratio β/α gives the redshift of the equivalence between both regimes. Cosmological parameters are fixed by observational data from primordial nucleosynthesis (PN), supernovae of the type Ia (SNIa), gamma-ray bursts (GRBs) and baryon acoustic oscillations (BAOs). The calibration of the 138 GRB events is performed using the 580 SNIa of the Union2.1 data set and a new set of 79 high-redshift GRB is obtained. The various sets of data are used in different combinations to constraint the parameters through statistical analysis. The UM is compared to the ΛCDM model and their differences are emphasized 2020-08-28T14:46:17Z 2020-08-28T14:46:17Z 2016-01-15 article CUZINATTO, Rodrigo R.; MORAIS, Eduardo M. de; MEDEIROS, Leo G.. Observational constraints to a unified cosmological model. Astroparticle Physics, [S.L.], v. 73, p. 52-61, jan. 2016. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0927650515001279?via%3Dihub. Acesso em: 12 ago. 2020. http://dx.doi.org/10.1016/j.astropartphys.2015.08.002. 0927-6505 https://repositorio.ufrn.br/jspui/handle/123456789/29905 10.1016/j.astropartphys.2015.08.002 en Elsevier
institution Repositório Institucional
collection RI - UFRN
language English
topic Unified dark components
Primordial nucleosynthesis
SNIa
GRB
BAO
spellingShingle Unified dark components
Primordial nucleosynthesis
SNIa
GRB
BAO
Medeiros, Léo Gouvêa
Cuzinatto, R.R.
Morais, Eduardo Messias de
Observational constraints to a unified cosmological model
description We propose a phenomenological unified model (UM) for dark matter and dark energy based on an equation of state parameter w that scales with the of the redshift. The free parameters of the model are three constants: Ωb0, α and β. Parameter α dictates the transition rate between the matter dominated era and the accelerated expansion period. The ratio β/α gives the redshift of the equivalence between both regimes. Cosmological parameters are fixed by observational data from primordial nucleosynthesis (PN), supernovae of the type Ia (SNIa), gamma-ray bursts (GRBs) and baryon acoustic oscillations (BAOs). The calibration of the 138 GRB events is performed using the 580 SNIa of the Union2.1 data set and a new set of 79 high-redshift GRB is obtained. The various sets of data are used in different combinations to constraint the parameters through statistical analysis. The UM is compared to the ΛCDM model and their differences are emphasized
format article
author Medeiros, Léo Gouvêa
Cuzinatto, R.R.
Morais, Eduardo Messias de
author_facet Medeiros, Léo Gouvêa
Cuzinatto, R.R.
Morais, Eduardo Messias de
author_sort Medeiros, Léo Gouvêa
title Observational constraints to a unified cosmological model
title_short Observational constraints to a unified cosmological model
title_full Observational constraints to a unified cosmological model
title_fullStr Observational constraints to a unified cosmological model
title_full_unstemmed Observational constraints to a unified cosmological model
title_sort observational constraints to a unified cosmological model
publisher Elsevier
publishDate 2020
url https://repositorio.ufrn.br/jspui/handle/123456789/29905
work_keys_str_mv AT medeirosleogouvea observationalconstraintstoaunifiedcosmologicalmodel
AT cuzinattorr observationalconstraintstoaunifiedcosmologicalmodel
AT moraiseduardomessiasde observationalconstraintstoaunifiedcosmologicalmodel
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