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タイトル: | Primordial gravitational waves in bimetric gravity |
著者: | Sakakihara, Yuki Soda, Jiro |
著者名の別形: | 榊原, 由貴 |
キーワード: | inflation primordial gravitational waves (theory) |
発行日: | 2-Sep-2015 |
出版者: | IOP Publishing |
誌名: | Journal of Cosmology and Astroparticle Physics |
巻: | 2015 |
論文番号: | 015 |
抄録: | We study primordial tensor power-spectra generated during inflation in bimetric gravity. More precisely, we examine a homogeneous expanding spacetime in a minimal bimetric model with an inflaton and calculate tensor perturbations on the homogeneous background under slow-roll approximation. In terms of the mass eigenstates, only the power-spectrum of the massless state remains constant and both the power-spectrum of the massive state and the cross power-spectrum rapidly decay during inflation. The amplitude of the physical power-spectrum is suppressed due to the flavor mixing. All power-spectra in the flavor eigenstates coincide with each other up to the first order of the slow-roll parameter. |
著作権等: | Article funded by SCOAP. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
URI: | http://hdl.handle.net/2433/216583 |
DOI(出版社版): | 10.1088/1475-7516/2015/09/015 |
出現コレクション: | 学術雑誌掲載論文等 |
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