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タイトル: | Effects of local features of the inflaton potential on the spectrum and bispectrum of primordial perturbations |
著者: | Cadavid, Alexander Gallego Romano, Antonio Enea Gariazzo, Stefano |
発行日: | Jul-2016 |
出版者: | Springer Nature |
誌名: | The European Physical Journal C |
巻: | 76 |
論文番号: | 385 |
抄録: | We study the effects of a class of features of the potential of slow-roll inflationary models corresponding to a step symmetrically dumped by an even power negative exponential factor, which we call local features. Local-type features differ from other branch-type features considered previously, because the potential is only affected in a limited range of the scalar field value, and they are symmetric with respect to the location of the feature. This type of feature only affects the spectrum and bispectrum in a narrow range of scales which leave the horizon during the time interval corresponding to the modification of the potential. On the contrary branch-type features have effects on all the perturbation modes leaving the horizon when the field value is within the interval defining the branch, introducing for example differences in the power spectrum between large and small scale which are absent in the case of local-type features. The spectrum and bispectrum of primordial curvature perturbations are affected by oscillations around the scale k0 exiting the horizon at the time τ0 corresponding to the feature. We also compute the effects of the features on the CMB temperature and polarization spectra, showing the effects of different choices of parameters. |
著作権等: | © The Author(s) 2016 This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3. |
URI: | http://hdl.handle.net/2433/226920 |
DOI(出版社版): | 10.1140/epjc/s10052-016-4232-4 |
出現コレクション: | 学術雑誌掲載論文等 |
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