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PhysRevD.97.043512.pdf | 265.51 kB | Adobe PDF | 見る/開く |
タイトル: | Solving the flatness problem with an anisotropic instanton in Hořava-Lifshitz gravity |
著者: | Bramberger, Sebastian F. Coates, Andrew Magueijo, João Mukohyama, Shinji Namba, Ryo Watanabe, Yota |
著者名の別形: | 向山, 信治 |
発行日: | 15-Feb-2018 |
出版者: | American Physical Society (APS) |
誌名: | Physical Review D |
巻: | 97 |
号: | 4 |
論文番号: | 043512 |
抄録: | In Hořava-Lifshitz gravity a scaling isotropic in space but anisotropic in spacetime, often called “anisotropic scaling, ” with the dynamical critical exponent z=3, lies at the base of its renormalizability. This scaling also leads to a novel mechanism of generating scale-invariant cosmological perturbations, solving the horizon problem without inflation. In this paper we propose a possible solution to the flatness problem, in which we assume that the initial condition of the Universe is set by a small instanton respecting the same scaling. We argue that the mechanism may be more general than the concrete model presented here. We rely simply on the deformed dispersion relations of the theory, and on equipartition of the various forms of energy at the starting point. |
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/2433/230497 |
DOI(出版社版): | 10.1103/PhysRevD.97.043512 |
出現コレクション: | 学術雑誌掲載論文等 |
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