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  Solving the flatness problem with an anisotropic instanton in Horava-Lifshitz gravity

Bramberger, S. F., Coates, A., Magueijo, J., Mukohyama, S., Namba, R., & Watanabe, Y. (2018). Solving the flatness problem with an anisotropic instanton in Horava-Lifshitz gravity. Physical Review D, 97: 043512. doi:10.1103/PhysRevD.97.043512.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-6372-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-E8C7-8
Genre: Journal Article

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 Creators:
Bramberger, Sebastian F.1, Author              
Coates, Andrew, Author
Magueijo, João, Author
Mukohyama, Shinji, Author
Namba, Ryo, Author
Watanabe, Yota, Author
Affiliations:
1Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1753351              

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Free keywords: High Energy Physics - Theory, hep-th,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO,General Relativity and Quantum Cosmology, gr-qc
 Abstract: In Ho\v{r}ava-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, and 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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 Dates: 2017-09-202018
 Publication Status: Published in print
 Pages: 10 pages, 5 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1709.07084
URI: http://arxiv.org/abs/1709.07084
DOI: 10.1103/PhysRevD.97.043512
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 97 Sequence Number: 043512 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258