235 citations · 2.2k across the 57 of their papers we have counts for
6 papers · 1 filter
Higgs-Inflaton Mixing and Vacuum Stability
Yohei Ema, Mindaugas Karciauskas, Oleg Lebedev +2
The quartic and trilinear Higgs field couplings to an additional real scalar are renormalizable, gauge and Lorentz invariant. Thus, on general grounds, one expects such couplings b…
Explosive Axion Production from Saxion
Yohei Ema, Kazunori Nakayama
The dynamics of saxion in a supersymmetric axion model and its effect on the axion production is studied in detail. We find that the axion production is very efficient when the sax…
Electroweak Vacuum Metastability and Low-scale Inflation
Yohei Ema, Kyohei Mukaida, Kazunori Nakayama
We study the stability of the electroweak vacuum in low-scale inflation models whose Hubble parameter is much smaller than the instability scale of the Higgs potential. In general,…
Early Universe Higgs dynamics in the presence of the Higgs-inflaton and non-minimal Higgs-gravity couplings
Yohei Ema, Mindaugas Karciauskas, Oleg Lebedev +1
Apparent metastability of the electroweak vacuum poses a number of cosmological questions. These concern evolution of the Higgs field to the current vacuum, and its stability durin…
Flaxion: a minimal extension to solve puzzles in the standard model
Yohei Ema, Koichi Hamaguchi, Takeo Moroi +1
We propose a minimal extension of the standard model which includes only one additional complex scalar field, flavon, with flavor-dependent global U(1) symmetry. It not only explai…
Higgs Scalaron Mixed Inflation
Yohei Ema
We discuss the inflationary dynamics of a system with a non-minimal coupling between the Higgs and the Ricci scalar as well as a Ricci scalar squared term. There are two scalar mod…