Modified holographic dark energy

In this work, motivated by the energy bound suggested by Cohen et al., we propose the modified holographic dark energy (MHDE) model. Choosing the IR cut-off L = R-CC and considering the parameterizations n(2) = 2 - lambda a, n(2) = 2 - 3 lambda a(2)/(1 + 3a(2)) and n(2) = 2 - lambda a(2)/(beta + a(2)), we derive all the physical quantities of the non-saturated MHDE model analytically. We find that the non-saturated MHDE models with the parameterizations n(2) = 2 - lambda a and n(2) = 2 - 3 lambda a(2)/(1 + 3a(2)) are single-parameter models in practice. Also, we consider the cosmological constraints on the non-saturated MHDE, and find that it is well consistent with the observational data. (C) 2009 Elsevier B.V. All rights reserved.