A panorama of viable F(R) gravity dark energy models

被引:22
|
作者
Oikonomou, V. K. [1 ,2 ]
Giannakoudi, Ifigeneia [1 ]
机构
[1] Aristotle Univ Thessaloniki, Dept Phys, Thessaloniki 54124, Greece
[2] Tomsk State Univ Control Syst & Radioelect TUSUR, Int Ctr Grav & Cosmos, Lab Theoret Cosmol, Tomsk 634050, Russia
来源
关键词
Modified gravity; dark energy; late-time acceleration; f (R) gravity; INFLATION;
D O I
10.1142/S0218271822500754
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
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页数:21
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