Small steps towards grand unification and the electron/positron excesses in cosmic-ray experiments
Small steps towards grand unification and the electron/positron excesses in cosmic-ray experiments
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DOI：
10.1088/1126-6708/2009/08/086
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发表时间：
2009-06
影响因子：
5.4
通讯作者：
M. Ibe
中科院分区：
文献类型：
--
作者：
M. Ibe
我们考虑通过增加两个马约拉纳费米子对标准模型的一个小的扩展;它们是标准模型的SU（2）{sub L}和SU（3）{sub c}规范群的伴随表示。在此推广中，当三重态费米子和八重态费米子的质量分别小于10 {sup 12} GeV和10{sup 14} GeV时，在高于10{sup 15} GeV的能量尺度上实现了规范耦合统一.我们还表明，一个适当的对称性，确保了三重态费米子的热遗迹密度自然解释了所观察到的暗物质密度的中性成分的长寿命。在最近的宇宙射线实验中观察到的电子/正电子过剩也可以用三重态费米子的衰变来解释。
We consider a small extension of the standard model by adding two Majorana fermions; those are adjoint representations of the SU(2){sub L} and SU(3){sub c} gauge groups of the standard model. In this extension, the gauge coupling unification at an energy scale higher than 10{sup 15} GeV is realized when the masses of the triplet and the octet fermions are smaller than 10{sup 4} GeV and 10{sup 12} GeV, respectively. We also show that an appropriate symmetry ensures a long lifetime of the neutral component of the triplet fermion whose thermal relic density naturally explains the observed dark matter density. The electron/positron excesses observed in recent cosmic-ray experiments can be also explained by the decay of the triplet fermion.