Perturbations of single-field inflation in modified gravity theory
Qiu, TT; Xia JQ(夏俊卿); Xia, JQ
Source PublicationPHYSICS LETTERS B
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
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
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Cited Times:15 [INSPIRE]
Cited Times:14 [ADS]
Document Type期刊论文
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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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