Status | Confirmed |
Seminar Series | APC-TH |
Subjects | hep-th |
Date | Tuesday 3 October 2017 |
Time | 14:00 |
Institute | APC |
Seminar Room | 483 A - Malevitch |
Speaker's Last Name | Mukohyama |
Speaker's First Name | Shinji |
Speaker's Email Address | |
Speaker's Institution | Yukawa Institute for Theoretical Physics, Kyoto University |
Title | Solving the flatness problem with an anisotropic instanton in Horava-Lifshitz gravity |
Abstract | 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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