254 citations · 1.8k across the 51 of their papers we have counts for
5 papers · 1 filter
Level Crossing between QCD Axion and Axion-Like Particle
Ryuji Daido, Naoya Kitajima, Fuminobu Takahashi
We study a level crossing between the QCD axion and an axion-like particle, focusing on the recently found phenomenon, the axion roulette, where the axion-like particle runs along…
Disappearing Inflaton Potential via Heavy Field Dynamics
Naoya Kitajima, Fuminobu Takahashi
We propose a possibility that the inflaton potential is significantly modified after inflation due to heavy field dynamics. During inflation there may be a heavy scalar field stabi…
Domain Wall Formation from Level Crossing in the Axiverse
Ryuji Daido, Naoya Kitajima, Fuminobu Takahashi
We point out that domain wall formation is a more common phenomenon in the Axiverse than previously thought. Level crossing could take place if there is a mixing between axions, an…
Axion domain wall baryogenesis
Ryuji Daido, Naoya Kitajima, Fuminobu Takahashi
We propose a new scenario of baryogenesis, in which annihilation of axion domain walls generates a sizable baryon asymmetry. Successful baryogenesis is possible for a wide range of…
Gravitational waves from Higgs domain walls
Naoya Kitajima, Fuminobu Takahashi
The effective potential for the Standard Model Higgs field allows two quasi-degenerate vacua; one is our vacuum at the electroweak scale, while the other is at a much higher scale.…