Optimistic estimation on probing primordial gravitational waves with CMB B-mode polarization

doi:10.1093/mnras/sty3262

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	Optimistic estimation on probing primordial gravitational waves with CMB B-mode polarization
	Huang, QG ; Wang, S 2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019
卷号	483 期号:2 页码:2177-2184
关键词	INFLATIONARY UNIVERSE ANISOTROPIES FLATNESS HORIZON
ISSN号	0035-8711
DOI	10.1093/mnras/sty3262
英文摘要	In the measurements of cosmic microwave background polarizations, three frequency channels are necessary for discriminating the primordial B-modes from the polarized dust and the synchrotron emission. We carry out an optimistic estimate on the sensitivity to the detection of primordial gravitational waves using the cosmic microwave background B-modes only, and explore how to reach the thresholds for the tensor-to-scalar ratio r in the theoretically well-motivated inflation models. For example, Lyth bound implies r similar or equal to 2 x 10(-3) , a corrected Lyth bound shows r similar or equal to 7 x 10(-4), and some typical inflation models gives r similar or equal to 4 x 10(-5). Taking into account the up-to-date constraints on r, i.e. r(0.05) < 0.07 at 95 per cent confidence, we find that the consistency relation n(t) = -r/8 in the canonical single-field slow-roll inflation cannot be distinguished from the scale invariance, due to the cosmic variance in the power spectrum of cosmic microwave background B modes. The cosmic variance places an inevitable limit on the measurements of the tensor spectral index, i.e. sigma(nt) similar or equal to 0.01 for 2 <= l <= l(max) = 300.
学科主题	Astronomy & Astrophysics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23495]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Yangzhou Univ, Coll Phys Sci & Technol, Ctr Gravitat & Cosmol, Yangzhou 225009, Jiangsu, Peoples R China 2.Hunan Normal Univ, Synerget Innovat Ctr Quantum Effects & Applicat, Changsha 410081, Hunan, Peoples R China 3.Chinese Univ Hong Kong, Dept Phys, Hong Kong 999077, Peoples R China 4.Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Huang, QG,Wang, S. Optimistic estimation on probing primordial gravitational waves with CMB B-mode polarization[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,483(2):2177-2184.
APA	Huang, QG,&Wang, S.(2019).Optimistic estimation on probing primordial gravitational waves with CMB B-mode polarization.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,483(2),2177-2184.
MLA	Huang, QG,et al."Optimistic estimation on probing primordial gravitational waves with CMB B-mode polarization".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 483.2(2019):2177-2184.