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题名: Is there an effect of a nontrivial c(T) during inflation?
作者: Cai, Y ;  Wang, YT ;  Piao, YS
刊名: PHYSICAL REVIEW D
出版日期: 2016
卷号: 93, 期号:6, 页码:63005
学科分类: Astronomy & Astrophysics; Physics
DOI: http://dx.doi.org/10.1103/PhysRevD.93.063005
通讯作者: Cai, Y ;  Wang, YT ;  Piao, YS (reprint author), Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China. ;  Piao, YS (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
文章类型: Article
英文摘要: Recently, we have shown that the propagation speed c(T) of the primordial gravitational waves (GWs) might be nontrivially varying during inflation, which could induce local oscillations in the power spectrum of primordial GWs. In this paper, we numerically confirm that, although with a disformal redefinition of the metric the nontrivial c(T) may be set as unity, the power spectrum in the frame with c(T) = 1 is completely the same as that in the original disformal frame, i.e., the oscillating shape in the power spectrum is still reserved, since here the effect of c(T) is actually encoded in the nontrivially varying Hubble parameter. In addition, we also clarify how to obtain a blue-tilted GWs spectrum by imposing a rapidly decreasing c(T) during inflation.
类目[WOS]: Astronomy & Astrophysics ;  Physics, Particles & Fields
关键词[WOS]: FIELD-EQUATIONS ;  COSMOLOGY ;  UNIVERSE ;  PERTURBATIONS ;  TENSOR ;  SINGULARITY ;  INVARIANCE ;  SPECTRUM ;  FLATNESS ;  HORIZON
收录类别: SCI
项目资助者: NSFC [11222546] ;  National Basic Research Program of China [2010CB832804] ;  Strategic Priority Research Program of Chinese Academy of Sciences [XDA04000000]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21731
Appears in Collections:理论物理所2016年知识产出_期刊论文

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Recommended Citation:
Cai, Y,Wang, YT,Piao, YS. Is there an effect of a nontrivial c(T) during inflation?[J]. PHYSICAL REVIEW D,2016,93(6):63005.
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