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arXiv 0812.0120hep-ph
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超对称Seesaw模型中非热产生的右手中微子和超中微子的轻子生成

Leptogenesis Scenarios via Non-Thermally Produced Right-handed Neutrino and Sneutrino in Supersymmetric Seesaw Model

Masato Senami, Tsutomu Takayama

摘要:

从暴胀子衰变产生的右旋中微子出发,重新考虑了轻生说。除了中微子在产生后瞬间衰变这一已被充分研究的情况外,如果中微子在主宰宇宙后衰变,则轻生是可能的。在后一种情况下,右旋中微子可以在相对论性时衰变,也可以在非相对论性时衰变。特别是第一种情况,在文献中没有认真讨论。在宽参数范围内研究了由此产生的轻子不对称性和引力子问题的约束,包括这种情况下的所有情况。它还示出了如何这种leptogenesis方案取决于参数,暴胀衰变率(再加热温度),右手中微子质量,洗出参数,和约束的引力子问题。相对论性中微子衰变的轻子成因是有趣的,因为热和非热引力子问题都可以放松。

英文摘要:

We reconsidered leptogenesis scenario from right-handed (s)neutrino produced by the decay of inflaton. Besides the well-investigated case that the neutrino decays instantaneously after the production, leptogenesis is possible if neutrino decays after it dominates the universe. In the latter case, right-handed (s)neutrino can decay either while it is relativistic or after it becomes non-relativistic. Especially, the first case has not been discussed seriously in literatures. Resultant lepton asymmetry and constraints from the gravitino problem are studied in broad parameter region, including all cases of this scenario. It is also shown how this leptogenesis scenario depends on the parameters, the inflaton decay rate (the reheating temperature), the right-handed neutrino mass, the washout parameter, and the constraint from the gravitino problem. Leptogenesis from relativistic neutrino decay is interesting because both thermal and non-thermal gravitino problems can be relaxed.

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