The upper bound on the tensor-to-scalar ratio consistent with quantum gravity

doi:10.1088/1572-9494/abf824

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	The upper bound on the tensor-to-scalar ratio consistent with quantum gravity
	Wu, Lina ; Gao, Qing 1; Gong, Yungui 2; Jia, Yiding 3,4; Li, Tianjun 3,4
刊名	COMMUNICATIONS IN THEORETICAL PHYSICS
	2021
卷号	73 期号:7 页码:75402
关键词	PARTICLE PHYSICS MODELS NATURAL INFLATION DENSITY
ISSN号	0253-6102
DOI	10.1088/1572-9494/abf824
英文摘要	We consider the polynomial inflation with the tensor-to-scalar ratio as large as possible which can be consistent with the quantum gravity (QG) corrections and effective field theory (EFT). To get a minimal field excursion Delta phi for enough e-folding number N, the inflaton field traverses an extremely flat part of the scalar potential, which results in the Lyth bound to be violated. We get a CMB signal consistent with Planck data by numerically computing the equation of motion for inflaton f and using Mukhanov-Sasaki formalism for primordial spectrum. Inflation ends at Hubble slow-roll parameter epsilon(H)(1) = 1 or (a) over double dot = 0. Interestingly, we find an excellent practical bound on the inflaton excursion in the format a + b root r, where a is a tiny real number and b is at the order 1. To be consistent with QG/EFT and suppress the high-dimensional operators, we show that the concrete condition on inflaton excursion is Delta phi/M-Pl < 0.2 x root 10 similar or equal to 0.632. For n(s) = 0.9649, N-epsilon = 55, and Delta phi/M-Pl < 0.632, we predict that the tensor-to-scalar ratio is smaller than 0.0012 for such polynomial inflation to be consistent with QG/EFT.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27513]
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.Xian Technol Univ, Sch Sci, Xian 710021, Peoples R China 2.Southwest Univ, Sch Phys Sci & Technol, Chongqing 400715, Peoples R China 3.Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China 4.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 5.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wu, Lina,Gao, Qing,Gong, Yungui,et al. The upper bound on the tensor-to-scalar ratio consistent with quantum gravity[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2021,73(7):75402.
APA	Wu, Lina,Gao, Qing,Gong, Yungui,Jia, Yiding,&Li, Tianjun.(2021).The upper bound on the tensor-to-scalar ratio consistent with quantum gravity.COMMUNICATIONS IN THEORETICAL PHYSICS,73(7),75402.
MLA	Wu, Lina,et al."The upper bound on the tensor-to-scalar ratio consistent with quantum gravity".COMMUNICATIONS IN THEORETICAL PHYSICS 73.7(2021):75402.