期刊
EUROPEAN PHYSICAL JOURNAL C
卷 77, 期 9, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-017-5181-2
关键词
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We consider FRW cosmology in f (R) = R + gamma R-2 + delta R-3 modified framework. The Palatini approach reduces its dynamics to the simple generalization of Friedmann equation. Thus we study the dynamics in two-dimensional phase space with some details. After reformulation of the model in the Einstein frame, it reduces to the FRW cosmological model with a homogeneous scalar field and vanishing kinetic energy term. This potential determines the running cosmological constant term as a function of the Ricci scalar. As a result we obtain the emergent dark energy parametrization from the covariant theory. We study also singularities of the model and demonstrate that in the Einstein frame some undesirable singularities disappear.
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