| GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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A Generalized Semi-Holographic Universe |
| LI Hui1**, ZHANG Hong-Sheng2,4, ZHANG Yi3,4,5 |
1Department of Physics, Yantai University, 30 Qingquan Road, Yantai 264005
2Shanghai United Center for Astrophysics (SUCA), Shanghai Normal University, 100 Guilin Road, Shanghai 200234
3College of Mathematics and Physics, Chongqing University of Posts and Telecommunications, Chongqing 400065
4State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190
5High Energy Physics Division, Argonne National Laboratory, Lemont, IL 60439, USA
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| Cite this article: |
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LI Hui, ZHANG Hong-Sheng, ZHANG Yi 2013 Chin. Phys. Lett. 30 089801 |
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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.
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Received: 18 April 2013
Published: 21 November 2013
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