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Perturbations of single-field inflation in modified gravity theory
Qiu, TT; Xia JQ(夏俊卿); Xia, JQ
2015
发表期刊PHYSICS LETTERS B
卷号744页码:273-279
摘要In 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.
文章类型Article
学科领域Astronomy & Astrophysics; Physics
DOI10.1016/j.physletb.2015.03.061
收录类别SCI
WOS类目Astronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields
WOS记录号WOS:000353892000043
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被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228531
专题粒子天体物理中心
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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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