Cosmological Constraints on the Modified Entropic Force Model

Details Cosmological Constraints on the Modified Entropic Force Model Cosmological Constraints on the Modified Entropic Force Model

2010-05-10

arxiv.org/abs/1005.1445v3

Phys.Lett.B692:167-175,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages, 7 figures, revtex4; v2: discussions added, Phys. Lett. B in press; v3: published version

Scientific paper

10.1016/j.physletb.2010.07.036

Very recently, Verlinde considered a theory in which space is emergent through a holographic scenario, and proposed that gravity can be explained as an entropic force caused by changes in the information associated with the positions of material bodies. Then, motivated by the Debye model in thermodynamics which is very successful in very low temperatures, Gao modified the entropic force scenario. The modified entropic force (MEF) model is in fact a modified gravity model, and the universe can be accelerated without dark energy. In the present work, we consider the cosmological constraints on the MEF model, and successfully constrain the model parameters to a narrow range. We also discuss many other issues of the MEF model. In particular, we clearly reveal the implicit root to accelerate the universe in the MEF model.

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