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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…
Inflation and primordial non-Gaussianities of "generalized Galileons"
Xian Gao, Daniele A. Steer
We set up cosmological perturbation theory and study the cosmological implications of the so-called ``generalized Galileon'' developed in \cite{Deffayet:2011gz,horndeski}. This is…
Conserved cosmological perturbation in Galileon models
Xian Gao
We prove the existence of a fully nonlinear conserved curvature perturbation on large scales in Galileon-type scalar field models in two approaches. The first approach is based on…
From k-essence to generalised Galileons
Cédric Deffayet, Xian Gao, Daniele A. Steer +1
We determine the most general scalar field theories which have an action that depends on derivatives of order two or less, and have equations of motion that stay second order and l…