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Full bispectra from primordial scalar and tensor perturbations in the most general single-field inflation model
Xian Gao, Tsutomu Kobayashi, Maresuke Shiraishi +3
We compute the full bispectra, namely both auto- and cross- bispectra, of primordial curvature and tensor perturbations in the most general single-field inflation model whose scala…
New Cosmological Solutions in Massive Gravity
Tsutomu Kobayashi, Masaru Siino, Masahide Yamaguchi +1
We find new, simple cosmological solutions with flat, open, and closed spatial geometries, contrary to the previous wisdom that only the open model is allowed. The metric and the S…
Generalized Higgs inflation
Kohei Kamada, Tsutomu Kobayashi, Tomo Takahashi +2
We study Higgs inflation in the context of generalized G-inflation, i.e. the most general single-field inflation model with second-order field equations. The four variants of Higgs…
Black hole perturbation in the most general scalar-tensor theory with second-order field equations I: The odd-parity sector
Tsutomu Kobayashi, Hayato Motohashi, Teruaki Suyama
We perform a fully relativistic analysis of odd-type linear perturbations around a static and spherically symmetric solution in the most general scalar-tensor theory with second-or…