A Generalized Semi-Holographic Universe
LI Hui1** , ZHANG Hong-Sheng2,4 , ZHANG Yi3,4,5
1 Department of Physics, Yantai University, 30 Qingquan Road, Yantai 2640052 Shanghai United Center for Astrophysics (SUCA), Shanghai Normal University, 100 Guilin Road, Shanghai 2002343 College of Mathematics and Physics, Chongqing University of Posts and Telecommunications, Chongqing 4000654 State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 1001905 High Energy Physics Division, Argonne National Laboratory, Lemont, IL 60439, USA
Abstract ：We study the semi-holographic idea in the context of decaying dark components. The energy flow between dark energy and the compensating dark matter is thermodynamically generalized to involve a particle number variable dark component with non-zero chemical potential. It is found that, unlike the original semi-holographic model, no cosmological constant is needed for a dynamical evolution of the universe. A transient phantom phase appears while a non-trivial dark energy-dark matter scaling solution stays at a later time, which evades the big-rip and helps to resolve the coincidence problem. For reasonable parameters, the deceleration parameter is well consistent with current observations. The original semi-holographic model is extended and it also suggests that the concordance model may be reconstructed from the semi-holographic idea.
收稿日期: 2013-04-18
出版日期: 2013-11-21
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2013, Vol. 30 
