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Dark energy model with higher derivative of Hubble parameter

By Songbai Chen and Jiliang Jing


In this letter we consider a dark energy model in which the energy density is a function of the Hubble parameter $H$ and its derivative with respect to time $\rho_{de}=3\alpha \ddot{H}H^{-1}+3\beta\dot{H}+3\gamma H^2$. The behavior of the dark energy and the expansion history of the Universe depend heavily on the parameters of the model $\alpha$, $\beta$ and $\gamma$. It is very interesting that the age problem of the well-known three old objects can be alleviated in this models.Comment: 11 pages, 6 figures, the correct version accepted for publication in PL

Topics: General Relativity and Quantum Cosmology
Publisher: 'Elsevier BV'
Year: 2009
DOI identifier: 10.1016/j.physletb.2009.07.018
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