A Panorama of Viable \(F(R)\) Gravity Dark Energy Models

In this work we shall study the late-time dynamics of several \(F(R)\) gravity models. By appropriately expressing the field equations in terms of the redshift and of a statefinder function, we shall solve numerically the field equations using appropriate physical motivated initial conditions. We co...

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Bibliographic Details
Published in:arXiv.org 2022-05
Main Authors: Oikonomou, V K, Giannakoudi, Ifigeneia
Format: Article
Language:English
Subjects:
Constraint modelling
Dark energy
Gravity
Initial conditions
Red shift
Scalars
Online Access:Get full text
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Summary:In this work we shall study the late-time dynamics of several \(F(R)\) gravity models. By appropriately expressing the field equations in terms of the redshift and of a statefinder function, we shall solve numerically the field equations using appropriate physical motivated initial conditions. We consider models which, by construction, are described by a nearly \(R^2\)-model at early epochs and we fine tune the parameters to achieve viability and compatibility with the latest Planck constraints at late times. Such models provide a unified description of inflation and dark energy era and notably a common feature of all the models is the presence of dark energy oscillations. Furthermore, we show that, in contrast to general relativistic fluids and scalar field descriptions, a large spectrum of different dark energy physics is generated by simple \(F(R)\) gravity models, varying from phantom, to nearly de Sitter and to quintessential dark energy eras.
ISSN:2331-8422
DOI:10.48550/arxiv.2205.08599