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Cai, Y; Wang, YT; Piao, YS
Is there an effect of a nontrivial c(T) during inflation?
Source PublicationPHYSICAL REVIEW D
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.
Subject AreaAstronomy & Astrophysics ; Physics
Indexed BySCI
Funding OrganizationNSFC [11222546] ; National Basic Research Program of China [2010CB832804] ; Strategic Priority Research Program of Chinese Academy of Sciences [XDA04000000]
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Document Type期刊论文
Affiliation1.[Cai, Yong
2.Wang, Yu-Tong
3.Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China
4.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. 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.(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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