146 citations · 299 across the 17 of their papers we have counts for
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Insights on the Scale of Leptogenesis from Neutrino Masses and Neutrinoless Double-Beta Decay
Alessandro Granelli, Koichi Hamaguchi, Maura E. Ramirez-Quezada +3
We revisit the thermal leptogenesis scenario in the type-I seesaw framework featuring three heavy Majorana neutrinos with a hierarchical mass spectrum. We focus on low energy obser…
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…
Asymptotic Scale Invariance and its Consequences
Mikhail Shaposhnikov, Kengo Shimada
Scale invariance supplemented by the requirement of the absence of new heavy particles may play an important role in addressing the hierarchy problem. We discuss how the Standard M…
QCD-Electroweak First-Order Phase Transition in a Supercooled Universe
Satoshi Iso, Pasquale D. Serpico, Kengo Shimada
If the electroweak sector of the standard model is described by classically conformal dynamics, the early Universe evolution can be substantially altered. It is already known that-…
Dynamical fine-tuning of initial conditions for small field inflations
Satoshi Iso, Kazunori Kohri, Kengo Shimada
Small-field inflation (SFI) is widely considered to be unnatural because an extreme fine-tuning of the initial condition is necessary for sufficiently large e-folding. In this pape…
Small Field Coleman-Weinberg Inflation driven by Fermion Condensate
Satoshi Iso, Kazunori Kohri, Kengo Shimada
We revisit the small field Coleman-Weinberg (CW) inflation, which has the following two problems. First, the smallness of the slow roll parameter requires the inflation scale t…
Coherent Flavour Oscillation and CP Violating Parameter in Thermal Resonant Leptogenesis
Satoshi Iso, Kengo Shimada
Solving the Kadanoff-Baym (KB) equations in a different method from our previous analysis, we obtain the CP violating parameter in the thermal resonant leptogenesis w…
Kadanoff-Baym approach to the thermal resonant leptogenesis
Satoshi Iso, Kengo Shimada, Masato Yamanaka
Using the non-equilibrium Green function method (Kadanoff-Baym equations) in the expanding universe, we investigate evolution of the lepton number asymmetry when the right-handed (…