期刊
PHYSICAL REVIEW D
卷 97, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.97.043512
关键词
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资金
- Studienstiftung des Deutschen Volkes
- Japan Society for the Promotion of Sciences
- STFC consolidated grant
- John Templeton Foundation
- Japan Society for the Promotion of Science (JSPS) [17H02890, 17H06359, 17H06357]
- World Premier International Research Center Initiative (WPI), MEXT, Japan
- Natural Sciences and Engineering Research Council of Canada
- JSPS [16J06266]
- Program for Leading Graduate Schools, MEXT, Japan
- STFC [ST/P000762/1, ST/G000743/1, ST/L00044X/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [16J06266, 17H02890, 17H06357] Funding Source: KAKEN
- Science and Technology Facilities Council [ST/P000762/1, ST/L00044X/1, ST/G000743/1] Funding Source: researchfish
In Horava-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.
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