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Simple cosmological model with inflation and late times acceleration


Simple cosmological model with inflation and late times acceleration

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dc.contributor.author Szydłowski, Marek [SAP11012138] pl
dc.contributor.author Stachowski, Aleksander [USOS63483] pl
dc.date.accessioned 2018-08-14T11:35:53Z
dc.date.available 2018-08-14T11:35:53Z
dc.date.issued 2018 pl
dc.identifier.issn 1434-6044 pl
dc.identifier.uri https://ruj.uj.edu.pl/xmlui/handle/item/56189
dc.language eng pl
dc.rights Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa *
dc.rights.uri https://creativecommons.org/licenses/by/4.0/deed.pl *
dc.title Simple cosmological model with inflation and late times acceleration pl
dc.type JournalArticle pl
dc.abstract.en In the framework of polynomial Palatini cosmology, we investigate a simple cosmological homogeneous and isotropic model with matter in the Einstein frame. We show that in this model during cosmic evolution, early inflation appears and the accelerating phase of the expansion for the late times. In this frame we obtain the Friedmann equation with matter and dark energy in the form of a scalar field with a potential whose form is determined in a covariant way by the Ricci scalar of the FRW metric. The energy density of matter and dark energy are also parameterized through the Ricci scalar. Early inflation is obtained only for an infinitesimally small fraction of energy density of matter. Between the matter and dark energy, there exists an interaction because the dark energy is decaying. For the characterization of inflation we calculate the slow roll parameters and the constant roll parameter in terms of the Ricci scalar. We have found a characteristic behavior of the time dependence of density of dark energy on the cosmic time following the logistic-like curve which interpolates two almost constant value phases. From the required numbers of N-folds we have found a bound on the model parameter. pl
dc.description.volume 78 pl
dc.description.number 3 pl
dc.identifier.doi 10.1140/epjc/s10052-018-5722-3 pl
dc.identifier.eissn 1434-6052 pl
dc.title.journal The European Physical Journal. C, Particles and Fields 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 249 pl
dc.rights.original CC-BY; otwarte czasopismo; ostateczna wersja wydawcy; w momencie opublikowania; 0 pl
dc.identifier.project ROD UJ / OP pl
.pointsMNiSW [2018 A]: 40

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Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa Except where otherwise noted, this item's license is described as Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa