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10 papers · 2 filters
AdS Black Hole Solution in Dilatonic Einstein-Gauss-Bonnet Gravity
Kei-ichi Maeda, Nobuyoshi Ohta, Yukinori Sasagawa
We find that AdS spacetime with a non-trivial linear dilaton field is an exact solution in the effective action of string theory, which is described by gravity with the Gauss-Bonne…
Non-Abelian Discrete Flavor Symmetries on Orbifolds
Hiroyuki Abe, Kang-Sin Choi, Tatsuo Kobayashi +2
We study non-Abelian flavor symmetries on orbifolds, and . Our extra dimensional models realize , , and including and $S_…
Cosmological rotating black holes in five-dimensional fake supergravity
Masato Nozawa, Kei-ichi Maeda
In recent series of papers, we found an arbitrary dimensional, time-evolving and spatially-inhomogeneous solutions in Einstein-Maxwell-dilaton gravity with particular couplings. Si…
Natural selection of inflationary vacuum required by infra-red regularity and gauge-invariance
Yuko Urakawa, Takahiro Tanaka
It has been an issue of debate whether the inflationary infrared(IR) divergences are physical or not. Our claim is that, at least, in single-field models, the answer is "No," and t…
IR divergence does not affect the gauge-invariant curvature perturbation
Yuko Urakawa, Takahiro Tanaka
We address the infrared(IR) divergence problem during inflation that appears in the loop corrections to the primordial perturbations. In our previous paper, we claimed that, at lea…
Oscillating Universe in Horava-Lifshitz Gravity
Kei-ichi Maeda, Yosuke Misonoh, Tsutomu Kobayashi
We study the dynamics of isotropic and homogeneous universes in the generalized Hořava-Lifshitz gravity, and classify all possible evolutions of vacuum spacetime. In the case witho…