Nearly scale-invariant spectrum of adiabatic fluctuations may be from a very slowly expanding phase of the Universe

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	Nearly scale-invariant spectrum of adiabatic fluctuations may be from a very slowly expanding phase of the Universe
	Piao, YS ; Zhou, E
刊名	PHYSICAL REVIEW D
	2003-10-15
卷号	68 期号:8
关键词	inflationary universe cosmology flatness scenario quantum horizon phantom
ISSN号	1550-7998
其他题名	Phys. Rev. D
中文摘要	In this paper we construct an expanding phase with phantom matter, in which the scale factor expands very slowly but the Hubble parameter increases gradually, and assume that this expanding phase could be matched to our late observational cosmology by the proper mechanism. We obtain the nearly scale-invariant spectrum of adiabatic fluctuations in this scenario; different from the simplest inflation and usual ekpyrotic or cyclic scenario, the tilt of the nearly scale-invariant spectrum in this scenario is blue. Although there exists an uncertainty surrounding the way in which the perturbations propagate through the transition in our scenario, which is dependent on the details of possible "bounce" physics, compared with inflation and the ekpyrotic or cyclic scenario, our work may provide another feasible cosmological scenario generating the nearly scale-invariant perturbation spectrum.
英文摘要	In this paper we construct an expanding phase with phantom matter, in which the scale factor expands very slowly but the Hubble parameter increases gradually, and assume that this expanding phase could be matched to our late observational cosmology by the proper mechanism. We obtain the nearly scale-invariant spectrum of adiabatic fluctuations in this scenario; different from the simplest inflation and usual ekpyrotic or cyclic scenario, the tilt of the nearly scale-invariant spectrum in this scenario is blue. Although there exists an uncertainty surrounding the way in which the perturbations propagate through the transition in our scenario, which is dependent on the details of possible "bounce" physics, compared with inflation and the ekpyrotic or cyclic scenario, our work may provide another feasible cosmological scenario generating the nearly scale-invariant perturbation spectrum.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]	Astronomy & Astrophysics ; Physics
关键词[WOS]	PRE-BIG-BANG ; INFLATIONARY UNIVERSE ; STRING COSMOLOGY ; FLATNESS ; SCENARIO ; QUANTUM ; HORIZON ; PHANTOM
收录类别	SCI
原文出处	://WOS:000186422800021
语种	英语
WOS记录号	WOS:000186422800021
公开日期	2013-11-08
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/5314]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Chinese Acad Sci, Interdisciplinary Ctr Theoret Studies, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Piao, YS,Zhou, E. Nearly scale-invariant spectrum of adiabatic fluctuations may be from a very slowly expanding phase of the Universe[J]. PHYSICAL REVIEW D,2003,68(8).
APA	Piao, YS,&Zhou, E.(2003).Nearly scale-invariant spectrum of adiabatic fluctuations may be from a very slowly expanding phase of the Universe.PHYSICAL REVIEW D,68(8).
MLA	Piao, YS,et al."Nearly scale-invariant spectrum of adiabatic fluctuations may be from a very slowly expanding phase of the Universe".PHYSICAL REVIEW D 68.8(2003).