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PhysRevD.97.043512.pdf265.51 kBAdobe 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  kyouindb  KAKEN_id
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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