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题名: Oscillating modulation to B-mode polarization from varying propagating speed of primordial gravitational waves
作者: Cai, Y;  Wang, YT;  Piao, YS
刊名: PHYSICAL REVIEW D
出版日期: 2015
卷号: 91, 期号:10, 页码:103001
学科分类: Astronomy & Astrophysics ;  Physics
DOI: http://dx.doi.org/10.1103/PhysRevD.91.103001
通讯作者: Cai, Y (reprint author), Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China.
文章类型: Article
英文摘要: In low-energy effective string theory and modified gravity theories, the propagating speed c(T) of primordial gravitational waves may deviate from unity. We find that the steplike variation of c(T) during slow-roll inflation may result in an oscillating modulation to the B-mode polarization spectrum, which can hardly be imitated by adjusting other cosmological parameters, and the intensity of the modulation is determined by the dynamics of c(T). Thus provided that the foreground contribution is under control, high-precision cosmic microwave background (CMB) polarization observations will be able to put tight constraint on the variation of c(T), and so the corresponding theories.
类目[WOS]: Astronomy & Astrophysics ;  Physics, Particles & Fields
关键词[WOS]: FIELD-EQUATIONS ;  SPECTRUM ;  INFLATION ;  UNIVERSE ;  CMB ;  PERTURBATIONS ;  RADIATION ;  COSMOLOGY ;  TENSOR ;  SCALE
收录类别: SCI
项目资助者: NSFC [11222546] ;  National Basic Research Program of China [2010CB832804]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21004
Appears in Collections:理论物理所2015年知识产出_期刊论文

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Recommended Citation:
Cai, Y,Wang, YT,Piao, YS. Oscillating modulation to B-mode polarization from varying propagating speed of primordial gravitational waves[J]. PHYSICAL REVIEW D,2015,91(10):103001.
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