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Higgs G-inflation
Kohei Kamada, Tsutomu Kobayashi, Masahide Yamaguchi +1
A new class of inflation models within the context of G-inflation is proposed, in which the standard model Higgs boson can act as an inflaton thanks to Galileon-like non-linear der…
Improved estimation of radiated axions from cosmological axionic strings
Takashi Hiramatsu, Masahiro Kawasaki, Toyokazu Sekiguchi +2
Cosmological evolution of axionic string network is analyzed in terms of field-theoretic simulations in a box of 512^3 grids, which are the largest ever, using a new and more effic…
On Classification of Models of Large Local-Type Non-Gaussianity
Teruaki Suyama, Tomo Takahashi, Masahide Yamaguchi +1
We classify models generating large local-type non-Gaussianity into some categories by using some "consistency relations" among the non-linearity parameters f_{NL}^{local}, τ_{NL}^…
G-inflation: inflation driven by the Galileon field
Tsutomu Kobayashi, Masahide Yamaguchi, Jun'ichi Yokoyama
We propose a new class of inflation model, G-inflation, which has a Galileon-like nonlinear derivative interaction of the form in the Lagrangian with the r…
Fate of thermal log type Q balls
Takeshi Chiba, Kohei Kamada, Shinta Kasuya +1
We study time evolution of the ball in thermal logarithmic potential using lattice simulations. As the temperature decreases due to the cosmic expansion, the thermal logarithmi…
Dark energy from primordial inflationary quantum fluctuations
Christophe Ringeval, Teruaki Suyama, Tomo Takahashi +2
We show that current cosmic acceleration can be explained by an almost massless scalar field experiencing quantum fluctuations during primordial inflation. Provided its mass does n…