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=RCC and considering the parameterizations n2=2−λa, n2=2−3λa2/(1+3a2) and n2=2−λa2/(β+a2), we derive all the physical quantities of the non-saturated MHDE model analytically. We find that the non-saturated MHDE models with the parameterizations n2=2−λa and n2=2−3λa2/(1+3a2) 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.