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Gravitational Waves from Q-ball Formation
Takeshi Chiba, Kohei Kamada, Masahide Yamaguchi
We study the detectability of the gravitational waves (GWs) from the Q-ball formation associated with the Affleck-Dine (AD) mechanism, taking into account both of the dilution effe…
Large scale evolution of the curvature perturbation in Horava-Lifshitz cosmology
Tsutomu Kobayashi, Yuko Urakawa, Masahide Yamaguchi
In the non-relativistic theory of gravity recently proposed by Horava, the Hamiltonian constraint is not satisfied locally at each point in space. The absence of the local Hamilton…
Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations
Tomo Takahashi, Masahide Yamaguchi, Shuichiro Yokoyama
We investigate primordial non-Gaussianity and dark matter isocurvature fluctuations in the modulated reheating and the curvaton scenarios. In these scenarios, large non-Gaussianity…
Gravitino Dark Matter and Non-Gaussianity
Tomo Takahashi, Masahide Yamaguchi, Jun'ichi Yokoyama +1
We investigate density fluctuations in a scenario with gravitino dark matter in the framework of modulated reheating, which is known to generate large non-Gaussianity. We show that…