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PhysRevD.97.063521.pdf | 244.1 kB | Adobe PDF | 見る/開く |
タイトル: | Vector disformal transformation of cosmological perturbations |
著者: | Papadopoulos, Vassilis Zarei, Moslem Firouzjahi, Hassan Mukohyama, Shinji |
著者名の別形: | 向山, 信治 |
発行日: | 15-Mar-2018 |
出版者: | American Physical Society (APS) |
誌名: | Physical Review D |
巻: | 97 |
号: | 6 |
論文番号: | 063521 |
抄録: | We study disformal transformations of cosmological perturbations by vector fields in theories invariant under U(1) gauge transformations. Three types of vector disformal transformations are considered: (i) disformal transformations by a single timelike vector; (ii) disformal transformations by a single spacelike vector; and (iii) disformal transformations by three spacelike vectors. We show that transformations of type (i) do not change either curvature perturbation or gravitational waves; that those of type (ii) do not change curvature perturbation but change gravitational waves; and that those of type (iii) change both curvature perturbation and gravitational waves. Therefore, coupling matter fields to the metric after disformal transformations of type (ii) or (iii) in principle have observable consequences. While the recent multi-messenger observation of binary neutron stars has singled out a proper disformal frame at the present epoch with a high precision, the result of the present paper may thus help distinguishing disformal frames in the early universe. |
著作権等: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³. |
URI: | http://hdl.handle.net/2433/231075 |
DOI(出版社版): | 10.1103/PhysRevD.97.063521 |
出現コレクション: | 学術雑誌掲載論文等 |
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