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Nearly scale-invariant spectrum of adiabatic fluctuations may be from a very slowly expanding phase of the Universe
Alternative TitlePhys. Rev. D
Piao, YS; Zhou, E
2003-10-15
Source PublicationPHYSICAL REVIEW D
ISSN1550-7998
Volume68Issue:8
AbstractIn 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.; 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.
KeywordInflationary Universe Cosmology Flatness Scenario Quantum Horizon Phantom
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1103/PhysRevD.68.083515
URL查看原文
Indexed BySCI
Language英语
WOS KeywordPRE-BIG-BANG ; INFLATIONARY UNIVERSE ; STRING COSMOLOGY ; FLATNESS ; SCENARIO ; QUANTUM ; HORIZON ; PHANTOM
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000186422800021
Citation statistics
Cited Times:116[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5314
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Interdisciplinary Ctr Theoret Studies, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China
Recommended Citation
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).
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