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Statut |
Confirmé |
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Série |
APC-TH |
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Domaines |
hep-th |
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Date |
Mardi 3 Octobre 2017 |
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Heure |
14:00 |
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Institut |
APC |
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Salle |
483 A - Malevitch |
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Nom de l'orateur |
Mukohyama |
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Prenom de l'orateur |
Shinji |
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Addresse email de l'orateur |
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Institution de l'orateur |
Yukawa Institute for Theoretical Physics, Kyoto University |
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Titre |
Solving the flatness problem with an anisotropic instanton in Horava-Lifshitz gravity |
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Résumé |
The first half of this talk reviews the basic construction and some
known cosmological implications of a renormalizable theory of
gravitation called Horava-Lishitz gravity. In particular, I will
explain that (i) the anisotropic scaling with the dynamical critical
exponent z=3 renders a field theory of gravity renormalizable, that
(ii) the same anisotropic scaling solves the horizon problem and leads
to scale-invariant cosmological perturbations even without inflation
and that (iii) the infrared instability of the so-called projectable
version of the theory can be tamed under a certain condition. We then
propose a possible solution to the cosmological flatness problem, in
which we assume that the initial condition of the Universe is set by a
small instanton respecting the same anisotropic scaling.
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Numéro de preprint arXiv |
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Commentaires |
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Fichiers attachés |
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