Reheating-era leptogenesis
Reheating-era leptogenesis
复制标题
再加热时代的轻体发生
DOI：
10.1016/j.physletb.2016.10.067
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Kiyoharu Kawana
中科院分区：
文献类型：
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作者：
Yuta Hamada;Kiyoharu Kawana
我们提出了一个新的leptogenesis方案在再加热时代。我们的设置是最小的意义上说，除了标准模型拉格朗日，我们只考虑一个暴胀子和高维运营商。轻子数不对称性不是由重粒子的衰变产生的，而是由标准模型粒子之间的散射产生的。在暴胀子衰变后，模型在标准模型中用高维算子描述。萨哈罗夫的三个条件通过以下方式得到满足。轻子数的破缺是由5维算符实现的。复相位来自于六维四轻子算符。在再加热完成之前，宇宙就已经失去平衡了。结果表明，在暴胀子质量和再加热温度等较宽的参数范围内，都能成功地实现重子生成，这取决于截止尺度。由于我们只依赖于有效的拉格朗日，我们的方案可以适用于所有的机制，以产生中微子马约拉纳质量。
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 and higher dimensional operators. The lepton number asymmetry is produced not by the decay of a heavy particle, but by the scattering between the standard model particles. After the decay of an inflaton, the model is described within the standard model with higher dimensional operators. The Sakharov's three conditions are satisfied by the following way. The violation of the lepton number is realized by the dimension-5 operator. The complex phase comes from the dimension-6 four lepton operator. The universe is out of equilibrium before the reheating is completed. It is found that the successful baryogenesis is realized for the wide range of parameters, the inflaton mass and reheating temperature, depending on the cutoff scale. Since we only rely on the effective Lagrangian, our scenario can be applicable to all mechanisms to generate neutrino Majorana masses.