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ファイル | 記述 | サイズ | フォーマット | |
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PhysRevD.94.064059.pdf | 288.12 kB | Adobe PDF | 見る/開く |
タイトル: | Constraint on ghost-free bigravity from gravitational Cherenkov radiation |
著者: | Kimura, Rampei Tanaka, Takahiro https://orcid.org/0000-0001-8406-5183 (unconfirmed) Yamamoto, Kazuhiro Yamashita, Yasuho |
著者名の別形: | 田中, 貴浩 |
発行日: | 21-Sep-2016 |
出版者: | American Physical Society |
誌名: | Physical Review D - Particles, Fields, Gravitation, and Cosmology |
巻: | 94 |
号: | 6 |
論文番号: | 064059 |
抄録: | We investigate gravitational Cherenkov radiation in a healthy branch of background solutions in the ghost-free bigravity model. In this model, because of the modification of dispersion relations, each polarization mode can possess subluminal phase velocities, and the gravitational Cherenkov radiation could be potentially emitted from a relativistic particle. In the present paper, we derive conditions for the process of the gravitational Cherenkov radiation to occur and estimate the energy emission rate for each polarization mode. We found that the gravitational Cherenkov radiation emitted even from an ultrahigh energy cosmic ray is sufficiently suppressed for the graviton's effective mass less than 100 eV, and the bigravity model with dark matter coupled to the hidden metric is therefore consistent with observations of high energy cosmic rays. |
著作権等: | © 2016 American Physical Society. |
URI: | http://hdl.handle.net/2433/218350 |
DOI(出版社版): | 10.1103/PhysRevD.94.064059 |
出現コレクション: | 学術雑誌掲載論文等 |
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