Eur. Phys. J. C (2007) 52: 693-699
https://doi.org/10.1140/epjc/s10052-007-0408-2

Regular Article - Theoretical Physics

Holographic dark energy in a cyclic universe

¹ School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024, P.R. China
² Kavli Institute for Theoretical Physics China, Institute of Theoretical Physics, Chinese Academy of Sciences (KITPC/ITP-CAS), P.O. Box 2735, Beijing, 100080, P.R. China

^* e-mail: jfzhang@student.dlut.edu.cn

Received: 28 July 2007
Revised: 11 August 2007
Published online: 13 September 2007

Abstract

In this paper we study the cosmological evolution of the holographic dark energy in a cyclic universe, generalizing the model of holographic dark energy proposed by Li. The holographic dark energy with c<1 can realize a quintom behavior; namely, it evolves from a quintessence-like component to a phantom-like one. The holographic phantom energy density grows rapidly and dominates the late-time expanding phase, helping to realize a cyclic universe scenario in which the high energy regime is modified by the effects of quantum gravity, causing a turn-around (and a bounce) of the universe. The dynamical evolution of holographic dark energy in the regimes of low energy and high energy is governed by two differential equations, respectively. It is of importance to link the two regimes for this scenario. We propose a link condition giving rise to a complete picture of holographic evolution of a cyclic universe.