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Wu, Lina; Gao, Qing1; Gong, Yungui2; Jia, Yiding3,4; Li, Tianjun3,4
The upper bound on the tensor-to-scalar ratio consistent with quantum gravity
Source PublicationCOMMUNICATIONS IN THEORETICAL PHYSICS
Language英语
KeywordPARTICLE PHYSICS MODELS NATURAL INFLATION DENSITY
AbstractWe 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.
2021
ISSN0253-6102
Volume73Issue:7Pages:75402
Cooperation Status国内
Subject AreaPhysics
MOST Discipline CataloguePhysics, Multidisciplinary
DOI10.1088/1572-9494/abf824
Indexed BySCIE
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/27513
CollectionSCI期刊论文
Affiliation1.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
Recommended Citation
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.
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