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arXiv 1606.07884hep-ph
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与暴胀子耦合的中微子质量模型中的轻子生成

Leptogenesis in a neutrino mass model coupled with inflaton

Daijiro Suematsu

摘要:

我们提出了一个方案的基础上的暴胀衰变的辐射中微子质量模型扩展与单重标量的重子数不对称的产生。在这种情况下,轻子数的不对称性是通过由暴胀子衰变引起的非热右手中微子的衰变产生的。由于非热右手中微子的数量可能远大于热右手中微子,因此在较低的再加热温度下,该方案可以在没有任何共振效应的情况下工作。对于比Davidson-Ibarra束缚轻得多的右手中微子,可以产生足够的重子数不对称性。

英文摘要:

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 right-handed neutrinos caused from the inflaton decay. Since the amount of non-thermal right-handed 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.

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