Observational constraints on a phenomenological f (R,∂ R)-model

Medeiros, Léo Gouvêa; Melo, C.A.M.; Cuzinatto, R.R.; Pompeia, P.J.

Observational constraints on a phenomenological f (R,∂ R)-model

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dc.contributor.author	Medeiros, Léo Gouvêa
dc.contributor.author	Melo, C.A.M.
dc.contributor.author	Cuzinatto, R.R.
dc.contributor.author	Pompeia, P.J.
dc.date.accessioned	2020-08-31T23:55:34Z
dc.date.available	2020-08-31T23:55:34Z
dc.date.issued	2015-02-24
dc.description.resumo	This paper analyses the cosmological consequences of a modified theory of gravity whose action integral is built from a linear combination of the Ricci scalar R and a quadratic term in the covariant derivative of R. The resulting Friedmann equations are of the fifth-order in the Hubble function. These equations are solved numerically for a flat space section geometry and pressureless matter. The cosmological parameters of the higher-order model are fit using SN Ia data and X-ray gas mass fraction in galaxy clusters. The best-fit present-day t0 values for the deceleration parameter, jerk and snap are given. The coupling constant β of the model is not univocally determined by the data fit, but partially constrained by it. Density parameter Ωm0 is also determined and shows weak correlation with the other parameters. The model allows for two possible future scenarios: there may be either an eternal expansion or a Rebouncing event depending on the set of values in the space of parameters. The analysis towards the past performed with the best-fit parameters shows that the model is not able to accommodate a matter-dominated stage required to the formation of structure	pt_BR
dc.identifier.citation	CUZINATTO, R. R.; MELO, C. A. M.; MEDEIROS, L. G.; POMPEIA, P. J.. Observational constraints on a phenomenological $$f\left( R,\partial R\right) $$ f R , ∂ R -model. General Relativity And Gravitation, [s.l.], v. 47, n. 3, p. 29, 24 fev. 2015. Disponível em: https://link.springer.com/article/10.1007/s10714-015-1862-z. Acesso em: 12 ago. 2020. http://dx.doi.org/10.1007/s10714-015-1862-z.	pt_BR
dc.identifier.doi	10.1007/s10714-015-1862-z
dc.identifier.issn	0001-7701
dc.identifier.issn	1572-9532
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29910
dc.language	en	pt_BR
dc.publisher	General Relativity And Gravitation	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Observational constraints	pt_BR
dc.subject	Phenomenological	pt_BR
dc.subject	f(R,∂ R)-model	pt_BR
dc.title	Observational constraints on a phenomenological f (R,∂ R)-model	pt_BR
dc.type	article	pt_BR