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| Perturbations of single-field inflation in modified gravity theory | |
Qiu, TT; Xia JQ(夏俊卿) ; Xia, JQ
| |
| 2015 | |
| Source Publication | PHYSICS LETTERS B
 |
| ISSN | 0370-2693 |
| EISSN | 1873-2445 |
| Volume | 744Pages:273-279 |
| Subtype | Article |
| Abstract | 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. |
| Subject Area | Astronomy & Astrophysics; Physics |
| DOI | 10.1016/j.physletb.2015.03.061 |
| Indexed By | SCI ; INSPIREHEP ; ADS |
| Language | 英语 |
| WOS Research Area | Astronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields |
| WOS Subject | Astronomy & Astrophysics ; Physics |
| WOS ID | WOS:000353892000043 |
| ADS Bibcode | 2015PhLB..744..273Q |
| ADS URL | https://ui.adsabs.harvard.edu/abs/2015PhLB..744..273Q |
| ADS CITATIONS | https://ui.adsabs.harvard.edu/abs/2015PhLB..744..273Q/citations |
| inspireid | 1302366 |
| inspireURL | https://inspirehep.net/literature/1302366 |
| Citation statistics |
Cited Times:15 [INSPIRE]
Cited Times:14 [ADS]
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| Document Type | 期刊论文 |
| Identifier | http://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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