arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.4667hep-phastro-ph.HE
收藏

cosmic-ray实验中的电子/正电子过剩和大统一的小步骤

Small steps towards Grand Unification and the electron/positron excesses in cosmic-ray experiments

Masahiro Ibe

摘要:

我们考虑通过增加两个Majorana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)_L和SU(3)_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^{12} GeV和10^{15} GeV时,在高于10^{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,确保了长寿命的中性成分的三重态费米子的热遗迹密度自然解释了观察到的暗物质密度。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。

英文摘要:

We consider a small extension of the standard model by adding two Majorana fermions; those are adjoint representations of the SU(2)_L and SU(3)_c gauge groups of the standard model. In this extension, the gauge coupling unification at an energy scale higher than 10^{15} GeV is realized when the masses of the triplet and the octet fermions are smaller than 10^4 GeV and 10^{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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑