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Phase transition and monopole production in supergravity inflation
Kohei Kamada, Kazunori Nakayama, Jun'ichi Yokoyama
In F-term supergravity inflation models, scalar fields other than the inflaton generically receive a Hubble induced mass, which may restore gauge symmetries during inflation and ph…
Primordial non-Gaussianities of gravitational waves in the most general single-field inflation model
Xian Gao, Tsutomu Kobayashi, Masahide Yamaguchi +1
We completely clarify the feature of primordial non-Gaussianities of tensor perturbations in generalized G-inflation, i.e., the most general single-field inflation model with secon…
Temporal enhancement of super-horizon curvature perturbations from decays of two curvatons and its cosmological consequences
Teruaki Suyama, Jun'ichi Yokoyama
If more than one curvaton dominate the Universe at different epochs from each other, curvature perturbations can be temporarily enhanced to a value much larger than the observed on…
Generalized G-inflation: Inflation with the most general second-order field equations
Tsutomu Kobayashi, Masahide Yamaguchi, Jun'ichi Yokoyama
We study generalized Galileons as a framework to develop the most general single-field inflation models ever, Generalized G-inflation, containing yet further generalization of G-in…
Primordial non-Gaussianity from G-inflation
Tsutomu Kobayashi, Masahide Yamaguchi, Jun'ichi Yokoyama
We present a comprehensive study of primordial fluctuations generated from G-inflation, in which the inflaton Lagrangian is of the form with $X=-(\partialϕ)^…
f(R) Gravity and its Cosmological Implications
Hayato Motohashi, Alexei A. Starobinsky, Jun'ichi Yokoyama
We have investigated the evolution of a homogeneous isotropic background of the Universe and inhomogeneous subhorizon matter density perturbations in viable models of presen…