228 citations · 2.6k across the 85 of their papers we have counts for
8 papers · 1 filter
An O(750) GeV Resonance and Inflation
Yuta Hamada, Toshifumi Noumi, Gary Shiu +1
We study the possibility of a heavy scalar or pseudoscalar in TeV-scale beyond the Standard Model scenarios being the inflaton of the early universe in light of the recent O(750) G…
Reheating-era leptogenesis
Yuta Hamada, Kiyoharu Kawana
We propose a novel leptogenesis scenario at the reheating era. Our setup is minimal in the sense that, in addition to the standard model Lagrangian, we only consider an inflaton an…
Natural solution to the naturalness problem -- Universe does fine-tuning
Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana
We propose a new mechanism to solve the fine-tuning problem. We start from a multi-local action $ S=\sum_{i}c_{i}S_{i}+\sum_{i,j}c_{i,j}S_{i}S_{j}+\sum_{i,j,k}c_{i,j,k}S_{i}S_{j}S_…
Saddle point inflation in string-inspired theory
Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana
The observed value of the Higgs mass indicates the possibility that there is no supersymmetry below the Planck scale and that the Higgs can play the role of the inflaton. We examin…
Landau pole in the Standard Model with weakly interacting scalar fields
Yuta Hamada, Kiyoharu Kawana, Koji Tsumura
We consider the Standard Model with a new scalar field which is a representation of the with a hypercharge . The renormalization group running effects o…
Vanishing Higgs Potential in Minimal Dark Matter Models
Yuta Hamada, Kiyoharu Kawana
We consider the Standard Model with a new particle which is charged under with the hypercharge being zero. Such a particle is known as one of the dark matter (DM) candi…