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Dynamics and cosmological constraints on Brans-Dicke cosmology


Dynamics and cosmological constraints on Brans-Dicke cosmology

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dc.contributor.author Hrycyna, Orest pl
dc.contributor.author Szydłowski, Marek [SAP11012138] pl
dc.contributor.author Kamionka, Michał pl
dc.date.accessioned 2015-04-25T10:49:52Z
dc.date.available 2015-04-25T10:49:52Z
dc.date.issued 2014 pl
dc.identifier.issn 1550-7998 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/5749
dc.language eng pl
dc.title Dynamics and cosmological constraints on Brans-Dicke cosmology pl
dc.type JournalArticle pl
dc.abstract.en We investigate observational constraints on the Brans-Dicke cosmological model using observational data coming from distant supernovae type Ia, the Hubble function H(z) measurements, information coming from the Alcock-Paczyński test, and baryon acoustic oscillations. Our analysis is based on the modified Friedmann function resulting form dynamical investigations of Brans-Dicke cosmology in the vicinity of a de Sitter state. The qualitative theory of dynamical systems enables us to obtain three different behaviors in the vicinity of this state. We find for a linear approach to the de Sitter state $\omega _{BD} = -0.8606_{-0.1341}^{+0.8281}$, for an oscillatory approach to the de Sitter state $\omega _{BD} = -1.1103_{-0.1729}^{+0.1872}$, and for the transient de Sitter state represented by a saddle-type critical point $\omega _{BD} = -2.3837_{-4.5459}^{+0.4588}$. We obtain the mass of the Brans-Dicke scalar field at the present epoch as $m_{\phi}\sim H_{0}$. The Bayesian methods of model comparison are used to discriminate between obtained models. We show that observational data point toward vales of the $\omega _{BD}$ parameter close to the value suggested by the low-energy limit of the bosonic string theory. pl
dc.description.volume 90 pl
dc.description.number 12 pl
dc.identifier.doi 10.1103/PhysRevD.90.124040 pl
dc.identifier.eissn 1550-2368 pl
dc.title.journal Physical Review. D, Particles, Fields, Gravitation, and Cosmology pl
dc.language.container eng pl
dc.affiliation Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne pl
dc.subtype Article pl
dc.identifier.articleid 124040 pl
dc.rights.original bez licencji pl
.pointsMNiSW [2014 A]: 35

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