Revisiting holographic dark energy in cyclic cosmology

摘要

Considering the holographic dark energy (HDE) with two different infrared (IR) cutoffs, we study the evolution of a cyclic universe, which avoids the Big-Rip singularity. Our results show that, even in the absence of a mutual interaction between the cosmos sectors, the HDE model with the Hubble radius as IR cutoff can mimic a cosmological constant in the framework of a cyclic cosmology. In addition, we find that both the interacting and non-interacting universes may enter into a cycle of sequential contraction and expansion, if the Granda-Oliveros cutoff is chosen as the IR cutoff in the energy density of the HDE. We also investigate the instability of the model against perturbations and find the ranges of the parameters in which the model is stable.