165 citations · 1.9k across the 61 of their papers we have counts for
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More on cosmological constraints on spontaneous R-symmetry breaking models
Yuta Hamada, Kohei Kamada, Tatsuo Kobayashi +1
We study the spontaneous R-symmetry breaking model and investigate the cosmological constraints on this model due to the pseudo Nambu-Goldstone boson, R-axion. We consider the R-ax…
A Minimal Supersymmetric Model of Particle Physics and the Early Universe
Wilfried Buchmüller, Valerie Domcke, Kohei Kamada +1
We consider a minimal supersymmetric extension of the Standard Model, with right-handed neutrinos and local B-L, the difference between baryon and lepton number, a symmetry which i…
Graceful exit from Higgs G-inflation
Kohei Kamada, Tsutomu Kobayashi, Taro Kunimitsu +2
Higgs G-inflation is a Higgs inflation model with a generalized Galileon term added to the standard model Higgs field, which realizes inflation compatible with observations. Recent…
The Starobinsky Model from Superconformal D-Term Inflation
W. Buchmuller, V. Domcke, K. Kamada
We point out that in the large field regime, the recently proposed superconformal D-term inflation model coincides with the Starobinsky model. In this regime, the inflaton field do…
Cosmic R-string in thermal history
Kohei Kamada, Tatsuo Kobayashi, Keisuke Ohashi +1
We study stabilization of an unstable cosmic string associated with spontaneously broken symmetry, which otherwise causes a dangerous roll-over process. We demonstrate tha…
The Gravitational Wave Spectrum from Cosmological B-L Breaking
Wilfried Buchmuller, Valerie Domcke, Kohei Kamada +1
Cosmological B-L breaking is a natural and testable mechanism to generate the initial conditions of the hot early universe. If B-L is broken at the grand unification scale, the fal…