Holographic dark energy linearly interacting with dark matter

Abstract

We investigate a spatially flat Friedmann-Robertson-Walker (FRW) cosmological model with cold dark matter coupled to a modified holographic Ricci dark energy through a general interaction term linear in the energy densities of dark matter and dark energy, the total energy density and its derivative. Using the statistical method of ${\chi }^2$-function for the Hubble data, we obtain $H_0=73.6$km/sMpc, ${\omega }_s=-0.842$ for the asymptotic equation of state and $z_{acc}=0.89$. The estimated values of ${\Omega }_{c0}$ which fulfill the current observational bounds corresponds to a dark energy density varying in the range $0.25R < \ro_x < 0.27R$.

March 2012. 6 pp., 6 figures. Note: To appear in the proceedings of the CosmoSul conference, held in Rio de Janeiro, Brazil, 01-05 august of 2011

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