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题名: A new model of agegraphic dark energy
作者: Wei, Hao ;  蔡荣根
刊名: PHYSICS LETTERS B
出版日期: 2008
卷号: 660, 期号:3, 页码:113-117
关键词: KAROLYHAZY UNCERTAINTY RELATION ;  SPACE-TIME
学科分类: Physics
通讯作者: Wei, H , Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
部门归属: [Wei, H] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China; [Wei, H] Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China; [Cai, RG] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要: In this note, we propose a new model of agegraphic dark energy based on the Karolyhazy relation, where the time scale is chosen to be the conformal time eta of the Friedmann-Robertson-Walker (FRW) universe. We find that in the radiation-dominated epoch, the equation-of-state parameter of the new agegraphic dark energy omega(q) = - 1/3 whereas Omega(q) = n(2)a(2); in the matter-dominated epoch, omega(q) = -2/3 whereas Omega(q) = n(2)a(2)/4; eventually, the new agegraphic dark energy dominates; in the late time omega(q) --> -1 when a --> infinity, and the new agegraphic dark energy mimics a cosmological constant. In every stage, all things are consistent. The confusion in the original agegraphic dark energy model proposed in [R.G. Cai, Phys. Lett. B 657 (2007) 228, arXiv: 0707.4049 [hep-th]] disappears in this new model. Furthermore, Omega(q) << 1 is naturally satisfied in both radiation-dominated and matter-dominated epochs where a << 1. In addition, we further extend the new agegraphic dark energy model by including the interaction between the new agegraphic dark energy and background matter. In this case, we find that Wq can cross the phantom divide. (C) 2008 Elsevier B.V. All rights reserved.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000253739800006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5577
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Wei, Hao,Cai, Rong-Gen. A new model of agegraphic dark energy[J]. PHYSICS LETTERS B,2008,660(3):113-117.
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