149 citations · 671 across the 50 of their papers we have counts for
21 papers · 1 filter
Q-Balls in the presence of attractive force
Yu Hamada, Kiyoharu Kawana, TaeHun Kim +1
Q-balls are non-topological solitons in field theories whose stability is typically guaranteed by the existence of a global conserved charge. A classic realization is the Friedberg…
Higgs Alignment from Multicritical-Point Principle in Two Higgs Doublet Models
Hikaru Kawai, Kiyoharu Kawana, Kin-ya Oda +1
In models with non-minimal Higgs sectors, enforcing (near) Higgs alignment, necessary to prevent significant deviations in the Higgs boson coupling from the standard model predicti…
Gravitational waves in models with multicritical-point principle
Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana +2
The multicritical-point principle (MPP) provides a natural explanation of the large hierarchy between the Planck and electroweak scales. We consider a scenario in which MPP is appl…
Cosmology of Supercooled Universe
Kiyoharu Kawana
First-order phase transitions (FOPTs) are ubiquitous in physics beyond the Standard Model (SM). Recently, models with no dimensionful parameters in the tree-level action have been…
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…
On Preheating in Higgs Inflation
Yuta Hamada, Kiyoharu Kawana, Adam Scherlis
Recently, the problem of unitarity violation during the preheating stage of Higgs inflation with a large non-minimal coupling has been much discussed in the literature. We point ou…
Hillclimbing saddle point inflation
Kiyoharu Kawana, Katsuta Sakai
Recently a new inflationary scenario was proposed in arXiv:1703.09020 which can be applicable to an inflaton having multiple vacua. In this letter, we consider a more general situa…
RG-improvement of the effective action with multiple mass scales
Satoshi Iso, Kiyoharu Kawana
Improving the effective action by the renormalization group (RG) with several mass scales is an important problem in quantum field theories. A method based on the decoupling theore…
Classical conformality in the Standard Model from Coleman's theory
Kiyoharu Kawana
The classical conformality is one of the possible candidates for explaining the gauge hierarchy of the Standard Model. We show that it is naturally obtained from the Coleman's theo…
Models of LHC Diphoton Excesses Valid up to the Planck scale
Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana +1
We discuss a possibility to explain the LHC diphoton excesses at GeV by the new scalar that couples to the gauge bosons through the loop of new massive particles with Stan…
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…
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…
Multiple Point Principle of the Gauged B-L Model
Kiyoharu Kawana
We consider the multiple point principe (MPP), its breaking and the inflation of the gauged B-L model. Our results are based on the two-loop renormalization group equations (RGEs).…
Criticality and Inflation of the Gauged B-L Model
Kiyoharu Kawana
We consider the multiple point principle (MPP) and the inflation of the gauged B-L extension of the Standard Model (SM) with a classical conformality. We examine whether the scalar…
Multiple Point Principle of the Standard Model with Scalar Singlet Dark Matter and Right Handed Neutrinos
Kiyoharu Kawana
We consider the multiple point principle (MPP) of the Standard Model (SM) with the scalar singlet Dark Matter (DM) and three heavy right-handed neutrinos at the scale where the bet…
Weak Scale From the Maximum Entropy Principle
Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana
The theory of multiverse and wormholes suggests that the parameters of the Standard Model are fixed in such a way that the radiation of the universe at the final stage $S_{…
Evidence of the Big Fix
Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana
We give an evidence of the Big Fix. The theory of wormholes and multiverse suggests that the parameters of the Standard Model are fixed in such a way that the total entropy at the…