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Perturbations of single-field inflation in modified gravity theory
Qiu, TT; Xia JQ(夏俊卿); Xia, JQ
2015
Source PublicationPHYSICS LETTERS B
ISSN0370-2693
EISSN1873-2445
Volume744Pages:273-279
SubtypeArticle
AbstractIn this paper, westudy the case of single field inflation within the framework of modified gravity theory where the gravity part has an arbitrary form f(R). Via a conformal transformation, this case can be transformed into its Einstein frame where it looks like a two-field inflation model. However, due to the existence of the isocurvature modes in such a multi-degree-of-freedom (m.d.o.f.) system, the (curvature) perturbations are not equivalent in two frames, so despite of its convenience, itis illegal to treat the perturbations in its Einstein frame as the "real" ones as we always do for pure f(R) theory or single field with nonminimal coupling. Here by pulling the results of curvature perturbations back into its original Jordan frame, weshow explicitly the power spectrum and spectral index of the perturbations in the Jordan frame, as well as how it differs from the Einstein frame. Wealso fit our results with the newest Planck data. Since there is large parameter space in these models, weshow that it is easy to fit the data very well. (C) 2015 The Authors. Published by Elsevier B.V.
Subject AreaAstronomy & Astrophysics; Physics
DOI10.1016/j.physletb.2015.03.061
Indexed BySCI ; INSPIREHEP ; ADS
Language英语
WOS Research AreaAstronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields
WOS SubjectAstronomy & Astrophysics ; Physics
WOS IDWOS:000353892000043
ADS Bibcode2015PhLB..744..273Q
ADS URLhttps://ui.adsabs.harvard.edu/abs/2015PhLB..744..273Q
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2015PhLB..744..273Q/citations
inspireid1302366
inspireURLhttps://inspirehep.net/literature/1302366
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Cited Times:15 [INSPIRE]
Cited Times:11 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/228531
Collection中国科学院高能物理研究所
Recommended Citation
GB/T 7714
Qiu, TT,Xia JQ,Xia, JQ. Perturbations of single-field inflation in modified gravity theory[J]. PHYSICS LETTERS B,2015,744:273-279.
APA Qiu, TT,夏俊卿,&Xia, JQ.(2015).Perturbations of single-field inflation in modified gravity theory.PHYSICS LETTERS B,744,273-279.
MLA Qiu, TT,et al."Perturbations of single-field inflation in modified gravity theory".PHYSICS LETTERS B 744(2015):273-279.
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