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题名: Holography, the cosmological constant and the upper limit of the number of e-foldings
作者: 蔡荣根
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2004
期号: 2, 页码:-
关键词: PROBE WMAP OBSERVATIONS ;  INFLATIONARY UNIVERSE ;  PARAMETERS ;  SUPERNOVAE
学科分类: Physics
通讯作者: Cai, RG , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
部门归属: Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要: If the source of the current accelerating expansion of the universe is a positive cosmological constant, Banks and Fischler argued that there exists an upper limit of the total number of e-foldings of inflation. We further elaborate on the upper limit in the sense of viewing the cosmological horizon as the boundary of a cavity and of the holographic D-bound in a de Sitter space. Assuming a simple evolution model of inflation, we obtain an expression of the upper limit in terms of the cosmological constant, the energy density of the inflaton when the inflation starts, the energy density as the inflation ends and reheating temperature. We discuss how the upper limit is modified in the different evolution models of the universe. The holographic D-bound gives a higher upper limit than the entropy threshold in the cavity. For the most extreme case where the initial energy density of inflation is as high as the Planck energy, and the reheating temperature is as low as the energy scale of nucleosynthesis, the D-bound gives the upper limit as 146 and the entropy threshold as 122. For a reasonable assumption in the simplest cosmology, the holographic D-bound leads to a value of about 85, while the cavity model gives a value of around 65 for the upper limit, which is close to the value needed to solve the flatness problem and the horizon problem in the hot big bang cosmology.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000189361800007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14133
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Cai, RG. Holography, the cosmological constant and the upper limit of the number of e-foldings[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2004(2):-.
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