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タイトル: Primordial fluctuations from inflation in dRGT bimetric theory of gravity
著者: Sakakihara, Yuki
Tanaka, Takahiro  kyouindb  KAKEN_id
著者名の別形: 田中, 貴浩
キーワード: cosmological perturbation theory
in ation
modi ed gravity
primordial gravitational waves (theory)
発行日: 19-Sep-2016
出版者: IOP Publishing
誌名: Journal of Cosmology and Astroparticle Physics
巻: 2016
論文番号: 033
抄録: We investigate primordial gravitational waves and curvature perturbations in de Rham-Gabadadze-Tolley (dRGT) bimetric gravity. We evaluate the power-spectra in the leading order in slow roll. Taking into account the decay of massive graviton, we find that the action up to the second order reduces to the Einstein theory with a non-minimally coupled scalar field, which is simplified to a minimally coupled model by conformal transformation. We also find that the tensor to scalar ratio for large field inflation with power law potential is larger than the general relativity counterpart for any choice of parameters in dRGT bimetric gravity. In addition, we confirm that the usual consistency relation holds and we have a steeper spectrum for gravitational waves.
著作権等: Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License.
URI: http://hdl.handle.net/2433/218349
DOI(出版社版): 10.1088/1475-7516/2016/09/033
出現コレクション:学術雑誌掲載論文等

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