165 citations · 1.9k across the 61 of their papers we have counts for
6 papers · 1 filter
Cosmic R-string, R-tube and Vacuum Instability
Minoru Eto, Yuta Hamada, Kohei Kamada +3
We show that a cosmic string associated with spontaneous symmetry breaking gives a constraint for supersymmetric model building. In some models, the string can be viewed a…
Cosmological constraints on spontaneous R-symmetry breaking models
Yuta Hamada, Kohei Kamada, Tatsuo Kobayashi +1
We study general constraints on spontaneous R-symmetry breaking models coming from the cosmological effects of the pseudo Nambu-Goldstone bosons, R-axions. They are substantially p…
Higgs, Moduli Problem, Baryogenesis and Large Volume Compactifications
Tetsutaro Higaki, Kohei Kamada, Fuminobu Takahashi
We consider the cosmological moduli problem in the context of high-scale supersymmetry breaking suggested by the recent discovery of the standard-model like Higgs boson. In order t…
Evading the pulsar constraints on the cosmic string tension in supergravity inflation
Kohei Kamada, Yuhei Miyamoto, Jun'ichi Yokoyama
The cosmic string is a useful probe of the early Universe and may give us a clue to physics at high energy scales where any artificial particle accelerators cannot reach. Although…
Generalized Higgs inflation
Kohei Kamada, Tsutomu Kobayashi, Tomo Takahashi +2
We study Higgs inflation in the context of generalized G-inflation, i.e. the most general single-field inflation model with second-order field equations. The four variants of Higgs…
Asymmetric Dark Matter from Spontaneous Cogenesis in the Supersymmetric Standard Model
Kohei Kamada, Masahide Yamaguchi
The observational relation between the density of baryon and dark matter in the Universe, , is one of the most difficult problems to solve in modern cosmolo…