白矮星轴子、PAMELA数据和翻转SU（5）
White dwarf axions, PAMELA data, and flipped-SU(5)
摘要：
最近，有两个来自标准模型之外的物理学的暗示。一个是由于白矮星发射的耦合强度约为0.7 × 10 ^{-13}的弱相互作用轻粒子引起的可能的能量损失机制，另一个是PAMELA卫星实验观测到的高能正电子。我们构造了一个超对称的翻转SU（5）模型，SU（5）xU（1）_X，加上适当的附加对称性，[U（1）_H]_{gauge}x[U（1）_RxU（1）_Γ]_{global}xZ_2，使得这些可以用自发破缺的U（1）_Γ中质量为0.5 meV的轻亲电轴子和Z_2宇称中的两组分冷暗物质来解释.我们证明了在翻转的SU（5）中存在一种基本机制，允许过剩正电子通过带电的SU（2）单重轻子，但由于缺少SU（2）单重夸克而不允许过剩反质子。通过对电子和正电子谱的观测，我们揭示了带电SU（2）单态E在LHC实验中的发现潜力。有了这些对称性，我们还评论了顶夸克和底夸克之间的质量等级。
英文摘要：
Recently, there are two hints arising from physics beyond the standard model. One is a possible energy loss mechanism due to emission of very weakly interacting light particles from white dwarf stars, with a coupling strength ~ 0.7x10^{-13}, and another is the high energy positrons observed by the PAMELA satellite experiment. We construct a supersymmetric flipped-SU(5) model, SU(5)xU(1)_X with appropriate additional symmetries, [U(1)_H]_{gauge}x[U(1)_RxU(1)_Γ]_{global}xZ_2, such that these are explained by a very light electrophilic axion of mass 0.5 meV from the spontaneously broken U(1)_Γand two component cold dark matters from Z_2 parity. We show that in the flipped-SU(5) there exists a basic mechanism for allowing excess positrons through the charged SU(2) singlet leptons, but not allowing anti-proton excess due to the absence of the SU(2) singlet quarks. We show the discovery potential of the charged SU(2) singlet E at the LHC experiments by observing the electron and positron spectrum. With these symmetries, we also comment on the mass hierarchy between the top and bottom quarks.
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