Gravitational leptogenesis with kination and gravitational reheating
Gravitational leptogenesis with kination and gravitational reheating
复制标题
具有运动和重力再加热的重力轻子发生
DOI：
10.1088/1475-7516/2020/01/016
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发表时间：
2020
影响因子：
6.4
通讯作者：
Jun'ichi Yokoyama
中科院分区：
文献类型：
--
作者：
Kohei Kamada;Jun'ya Kume;Yusuke Yamada;Jun'ichi Yokoyama
我们重新审视引力leptogenesis的情况下，暴胀耦合到重力的陈-西蒙斯项和轻子的不对称性产生的引力异常的轻子数电流在暴胀过程中。我们约束可能的模型参数空间，要求没有鬼模式低于普朗克尺度，这将表明有效理论的崩溃，并评估各种再加热过程的净重子不对称性。我们发现，这些要求的机制是不足以解释所观察到的重子不对称的宇宙标准再加热的情况。然而，我们发现，与kination方案实现例如k-和G-暴胀模型，一个足够的重子不对称性可以产生在一个可行的范围内的模型参数。
We revisit the gravitational leptogenesis scenario in which the inflaton is coupled to gravity by the Chern-Simons term and the lepton asymmetry is generated through the gravitational anomaly in the lepton number current during inflation. We constrain the possible model parameter space by requiring the absence of ghost modes below the Planck scale, which would suggest the breakdown of the effective theory, and evaluate the net baryon asymmetry for various reheating processes. We find that the mechanism with these requirements is insufficient to explain the observed baryon asymmetry of the Universe for standard reheating scenarios. We show that, however, with the kination scenario realized in eg the k-and G-inflation models, a sufficient baryon asymmetry can be generated within a feasible range of the model parameters.