149 citations · 671 across the 50 of their papers we have counts for
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Multi-critical point principle as the origin of classical conformality and its generalizations
Hikaru Kawai, Kiyoharu Kawana
Multi-critical point principle (MPP) is one of the interesting theoretical possibilities that can explain the fine-tuning problems of the Universe. It simply claims that "the coupl…
Primordial black holes from a cosmic phase transition: The collapse of Fermi-balls
Kiyoharu Kawana, Ke-Pan Xie
We propose a novel primordial black hole (PBH) formation mechanism based on a first-order phase transition (FOPT). If a fermion species gains a huge mass in the true vacuum, the co…
Axion-CMB Scenario in Supercooled Universe
Satoshi Iso, Kiyoharu Kawana, Kengo Shimada
Axion-CMB scenario is an interesting possibility to explain the temperature anisotropy of the cosmic microwave background (CMB) by primordial fluctuations of the QCD axion \cite{Is…
Low-energy probes of small CMB amplitude in models of radiative Higgs mechanism
Sunghoon Jung, Kiyoharu Kawana
The small CMB amplitude (or, small temperature fluctuation ) typically requires an unnaturally small effective coupling of an inflaton $λ_…
Minimal scenario of Criticality for Electroweak scale, Neutrino Masses, Dark Matter, and Inflation
Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana +2
We propose a minimal model that can explain the electroweak scale, neutrino masses, Dark Matter (DM), and successful inflation all at once based on the multicritical-point principl…