Inflation in a modified radiative seesaw model

2016

Physics Letters B

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We propose a scenario for the generation of baryon number asymmetry based on the inflaton decay in a radiative neutrino mass model extended with singlet scalars. In this scenario, lepton number asymmetry is produced through the decay of non-thermal righthanded neutrinos caused from the inflaton decay. Since the amount of non-thermal righthanded neutrinos could be much larger than the thermal ones, the scenario could work without any resonance effect for rather low reheating temperature. Sufficient baryon number asymmetry can be generated for much lighter right-handed neutrinos compared with the Davidson-Ibarra bound. †

Section: A Radiative Seesaw Model Extended By Singlet Scalarsmentioning

confidence: 99%

“…Here we note that the inflaton mass m S inf is not constrained by the observational data of CMB as long as we assume the suitable inflation scenario such as the ones discussed in [6,7].…”

Section: Non-thermal Leptogenesis Associated To Reheatingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Leptogenesis in a neutrino mass model coupled with inflaton

2016

Physics Letters B

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“…4 This model connects the neutrino mass generation with the DM existence. It has been extensively studied from various phenomenological view points [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. In the present case, the right-handed neutrinos do not have their masses in a TeV region but they are considered to be much heavier.…”

Section: An Extension Of the Ksvz Modelmentioning

confidence: 99%

Dark matter stability and one-loop neutrino mass generation based on Peccei–Quinn symmetry

2018

Eur. Phys. J. C

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We propose a model which is a simple extension of the KSVZ invisible axion model with an inert doublet scalar. Peccei-Quinn symmetry forbids tree-level neutrino mass generation and its remnant Z 2 symmetry guarantees dark matter stability. The neutrino masses are generated by one-loop effects as a result of the breaking of PecceiQuinn symmetry through a nonrenormalizable interaction. Although the low energy effective model coincides with an original scotogenic model which contains right-handed neutrinos with large masses, it is free from the strong C P problem.

“…In several previous articles [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36], we have studied these problems in this model and its extena e-mail: shoichi@hep.s.kanazawa-u.ac.jp b e-mail: suematsu@hep.s.kanazawa-u.ac.jp sions. They suggest that these problems could be explained in a consistent way, simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Radiative neutrino mass model with degenerate right-handed neutrinos

Kashiwase

2016

Eur. Phys. J. C

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The radiative neutrino mass model can relate neutrino masses and dark matter at a TeV scale. If we apply this model to thermal leptogenesis, we need to consider resonant leptogenesis at that scale. It requires both finely degenerate masses for the right-handed neutrinos and a tiny neutrino Yukawa coupling. We propose an extension of the model with a U (1) gauge symmetry, in which these conditions are shown to be simultaneously realized through a TeV scale symmetry breaking. Moreover, this extension can bring about a small quartic scalar coupling between the Higgs doublet scalar and an inert doublet scalar which characterizes the radiative neutrino mass generation. It also is the origin of the Z 2 symmetry which guarantees the stability of dark matter. Several assumptions which are independently supposed in the original model are closely connected through this extension.