期刊
PHYSICS LETTERS B
卷 687, 期 2-3, 页码 103-109出版社
ELSEVIER
DOI: 10.1016/j.physletb.2010.03.028
关键词
Big bounce; Rainbow universe; Einstein's equation
资金
- NSFC [10663001, 10875057]
- JiangXi SF [0612036, 0612038]
- Chinese Ministry of Education [208072]
- Fok Ying Tung Education Foundation [111008]
- Nanchang University
- JiangXi Young Scientists (JingGang Star) Program
The usual Einstein's equations is modified as a one parameter family of equations in the framework of rainbow gravity. In this Letter we derive the modified Friedmann-Robertson-Walker (FRW) equations when the cosmological evolution of radiation particles is taken into account. In particular, given some specific dispersion relations, the big bounce solutions to the modified FRW equations can be derived. Notably, to obtain a well defined rainbow metric at the moment of the big bounce, we find it seems necessary to introduce a cosmological constant which depends on the energy of probes as well, implying that a universe with a positive cosmological constant more likely undergoes a big bounce at least at this phenomenological level. (C) 2010 Elsevier B.V. All rights reserved.
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