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タイトル: Cosmology in bimetric theory with an effective composite coupling to matter
著者: Gümrükçüoğ, A. Emir
Heisenberg, Lavinia
Mukohyama, Shinji  kyouindb  KAKEN_id
Tanahashi, Norihiro
著者名の別形: 向山, 信治
発行日: 8-Apr-2015
出版者: IOP Publishng
誌名: Journal of Cosmology and Astroparticle Physics
巻: 2015
号: 04
論文番号: 008
抄録: We study the cosmology of bimetric theory with a composite matter coupling. We find two possible branches of background evolution. We investigate the question of stability of cosmological perturbations. For the tensor and vector perturbations, we derive conditions on the absence of ghost and gradient instabilities. For the scalar modes, we obtain conditions for avoiding ghost degrees. In the first branch, we find that one of the scalar modes becomes a ghost at the late stages of the evolution. Conversely, this problem can be avoided in the second branch. However, we also find that the constraint for the second branch prevents the doubly coupled matter fields from being the standard ingredients of cosmology. We thus conclude that a realistic and stable cosmological model requires additional minimally coupled matter fields.
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. 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/2433/198623
DOI(出版社版): 10.1088/1475-7516/2015/04/008
出現コレクション:学術雑誌掲載論文等

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