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Cai, Y; Wang, YT; Piao, YS; 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.
Is there an effect of a nontrivial c(T) during inflation?
Source PublicationPHYSICAL REVIEW D
Language英语
AbstractRecently, 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.
2016
Volume93Issue:6Pages:63005
Subject AreaAstronomy & Astrophysics ; Physics
DOIhttp://dx.doi.org/10.1103/PhysRevD.93.063005
Indexed BySCI
Funding OrganizationNSFC [11222546] ; NSFC [11222546] ; NSFC [11222546] ; NSFC [11222546] ; National Basic Research Program of China [2010CB832804] ; National Basic Research Program of China [2010CB832804] ; National Basic Research Program of China [2010CB832804] ; National Basic Research Program of China [2010CB832804] ; Strategic Priority Research Program of Chinese Academy of Sciences [XDA04000000] ; Strategic Priority Research Program of Chinese Academy of Sciences [XDA04000000] ; Strategic Priority Research Program of Chinese Academy of Sciences [XDA04000000] ; Strategic Priority Research Program of Chinese Academy of Sciences [XDA04000000]
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/21731
Collection理论物理所科研产出_SCI论文
Corresponding AuthorCai, 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.
Recommended Citation
GB/T 7714
Cai, Y,Wang, YT,Piao, YS,et al. Is there an effect of a nontrivial c(T) during inflation?[J]. PHYSICAL REVIEW D,2016,93(6):63005.
APA Cai, Y,Wang, YT,Piao, YS,Piao, YS ,&Piao, YS .(2016).Is there an effect of a nontrivial c(T) during inflation?.PHYSICAL REVIEW D,93(6),63005.
MLA Cai, Y,et al."Is there an effect of a nontrivial c(T) during inflation?".PHYSICAL REVIEW D 93.6(2016):63005.
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