S_4味对称Extra U（1）模型中与PAMELA对抗的跷跷板机制
Seesaw Mechanism Confronting PAMELA in S_4 Flavor Symmetric Extra U(1) Model
摘要：
本文基于E_6激发的具有S_4味对称性的额外U（1）模型研究了PAMELA观测到的宇宙线异常。在我们的模型中，最轻的flavon具有O（10^18）秒的非常长的寿命，这比宇宙的年龄更长，但不足以解释PAMELA结果O（10^26）秒。如果考虑到黄酮不是暗物质的主要成分，这种情况是可以避免的。然而，非热处理的黄酮是需要获得适当的遗物密度。这将宇宙的再加热温度与跷跷板质量尺度联系起来。如果我们假设这个黄子是一个衰变成正电子（或电子）的粒子，那么质量尺度的跷跷板就受到了再加热温度的限制。因此，我们发现一个有趣的结果，允许的区域是在O（10^12）GeV左右，这与我们原来的结果是一致的。
英文摘要：
We study cosmic-ray anomaly observed by PAMELA based on E_6 inspired extra U(1) model with S_4 flavor symmetry. In our model, the lightest flavon has very long lifetime of O(10^18) second which is longer than the age of the universe, but not long enough to explain the PAMELA result O(10^26) sec. Such a situation could be avoidable by considering that the flavon is not the dominant component of dark matters. However non-thermalizing the flavon is needed to obtain proper relic density. This relates reheating temperature of the universe with seesaw mass scale. If we assume this flavon is a particle decaying into positron (or electron), the seesaw mass scale is constrained by reheating temperature. Thus we find an interesting result that the allowed region is around O(10^12) GeV, which is consistent with our original result.
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