http://arxiv.org/abs/2007.01123
The introduction of a kind of exponential damping in the correction to General Relativity gives promising results in the construction of viable dark energy model in the context of modified gravity. The model behaves as $R-2\Lambda$ at large curvature and tends to zero at $R\rightarrow 0$, containing flat spacetime solution and implying that the curvature effect that induces the accelerated expansion is unrelated to quantum vacuum energy in flat space-time. The cosmic evolution of the main density parameters in this model is consistent with current observations with an equation of state very close to $-1$ and the effective equation of state showing the transition deceleration-acceleration at $z\sim 0.5$. Apart from viable cosmology, satisfying cosmological and local gravity restrictions, the model may also show measurable differences with $\Lambda$CDM at recent times. Some features of the present model that highlight differences with the Hu-Sawicki model are discussed.
L. Granda
Fri, 3 Jul 20
57/57
Comments: 29 pages, 5 figures. arXiv admin note: text overlap with arXiv:2003.09006
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