Thermal leptogenesis in a model with mass varying neutrinos
Thermal leptogenesis in a model with mass varying neutrinos
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DOI：
10.1103/physrevd.69.113007
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发表时间：
2003-11
影响因子：
5
通讯作者：
X. Bi;Peihong Gu;Xiulian Wang;Xinmin Zhang
中科院分区：
文献类型：
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作者：
X. Bi;Peihong Gu;Xiulian Wang;Xinmin Zhang
在本文中，我们考虑的中微子质量变化的可能性在宇宙的演化过程中，并研究其对leptogenesis的影响。具体来说，我们采取中微子质量的最小跷跷板模型，并引入右手中微子和暗能量标量场之间的耦合，精髓。在我们的模型中，右手中微子的质量随着精髓的演变而变化。然后，我们详细研究了这个模型的参数空间所观察到的重子数不对称。我们的结果表明，与中微子质量不变的情况相比，在这种情况下降低再加热温度是可能的，这有助于解决引力子问题。此外，允许一个简并中微子的质量模式与m（i）大于最小leptogenesis方案中给出的上限。
In this paper we consider the possibility of the neutrino mass varying during the evolution of the Universe and study its implications on leptogenesis. Specifically, we take the minimal seesaw model of neutrino masses and introduce a coupling between the right-handed neutrinos and the dark energy scalar field, the quintessence. In our model, the right-handed neutrino masses change as the quintessence evolves. We then examine in detail the parameter space of this model allowed by the observed baryon number asymmetry. Our results show that it is possible to lower the reheating temperature in this scenario in comparison with the case that the neutrino masses are unchanged, which helps solve the gravitino problem. Furthermore, a degenerate neutrino mass pattern with m(i) larger than the upper limit given in the minimal leptogenesis scenario is permitted.