Holography, the cosmological constant and the upper limit of the number of e-foldings

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	Holography, the cosmological constant and the upper limit of the number of e-foldings
	Cai, RG; Cai, RG , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
刊名	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
	2004
期号	2 页码:-
关键词	Probe Wmap Observations Inflationary Universe Parameters Supernovae
ISSN号	1475-7516
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.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000189361800007
公开日期	2012-08-30
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/14133]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Cai, RG , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Cai, RG,Cai, RG , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.. Holography, the cosmological constant and the upper limit of the number of e-foldings[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2004(2):-.
APA	Cai, RG,&Cai, RG , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China..(2004).Holography, the cosmological constant and the upper limit of the number of e-foldings.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(2),-.
MLA	Cai, RG,et al."Holography, the cosmological constant and the upper limit of the number of e-foldings".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .2(2004):-.