Kaluza-Klein暗物质湮灭的gamma-ray谱特征及其可观测性
The gamma-ray spectral feature from Kaluza-Klein dark matter annihilation and its observability
摘要：
宇宙额外维度理论涉及卡鲁扎-克莱因（KK）粒子。最轻的KK粒子（LKP）是冷暗物质的最佳候选者之一。星系晕中LKP暗物质的湮灭产生高能伽马射线。γ射线谱显示出LKP质量周围的特征峰结构。本文研究了这种峰值结构的可观测性，考虑到他们的能量分辨率的近期未来的探测器，并计算了预期的伽马射线信号的能量谱。然后，通过使用HESS数据，我们设置了一些限制的助推因子，这是一个产品的湮灭截面相对于热的和一个不确定的因素依赖于子结构的LKP分布在星系晕，为每个LKP质量。所得到的升压因子的上限在1至30的范围内。这些约束条件可以看作是与γ射线和电子-正电子观测的结果相比较的。然而，TeV或更高能量区域的观测数据仍然有限，可能的LKP信号也不是决定性的。因此，我们希望在不久的将来，具有更好灵敏度的任务将澄清LKP暗物质是否应该存在。
英文摘要：
The theory of universal extra dimensions involves Kaluza-Klein (KK) particles. The lightest KK particle (LKP) is one of the good candidates for cold dark matter. Annihilation of LKP dark matter in the Galactic halo produces high-energy gamma-rays. The gamma-ray spectrum shows a characteristic peak structure around the LKP mass. This paper investigates the observability of this peak structure by near-future detectors taking account of their energy resolution, and calculates the expected energy spectrum of the gamma-ray signal. Then, by using the HESS data, we set some constraints on the boost factor, which is a product of the annihilation cross section relative to the thermal one and an uncertain factor dependent on the substructure of the LKP distribution in the Galactic halo, for each LKP mass. The resulting upper limit on the boost factor is in the range from 1 to 30. The constraints can be regarded as comparable with the results of previous work for gamma-ray and electron-positron observation. However, the observational data for the TeV or higher energy region are still limited, and the possible LKP signal is not conclusive. Thus, we expect near-future missions with better sensitivity will clarify whether the LKP dark matter should exist or not.
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