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arXiv 2007.11804astro-ph.COgr-qchep-ph
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来自银河系511 keV线的暗物质粒子和原始黑洞混合模型的约束

Constraints on a mixed model of dark matter particles and primordial black holes from the Galactic 511 keV line

Rong-Gen Cai, Yu-Chen Ding, Xing-Yu Yang, Yu-Feng Zhou

摘要:

银河系511 keV γ射线谱线是70年代以来观测到的,并被认为是电子正电子湮没的结果,但其起源至今仍不清楚。除了天体物理学的解释外,正电子来自暗物质湮灭的可能性也被广泛研究。原初黑洞(PBH)也是被广泛研究的DM候选者。如果PBH的存在,DM粒子可能会引力绑定到PBH和PBH周围的密度尖峰形成晕。在这些密度尖峰中的DM湮灭可以提高DM粒子的正电子产生率,但信号形态与衰减的DM相似。我们考虑这样一个由DM粒子和PBH组成的混合模型,并从INTEGRAL/SPI的511 keV γ射线数据中得到DM粒子衰变分量的上限和PBH丰度的约束。这些约束是通用的,并且独立于颗粒DM模型。对于DM和PBH的混合模型,对于质量在$1~\mathrm{TeV}$附近的DM粒子,PBH丰度的约束可以降到$O(10^{-17})$,比河外γ射线背景下的约束更严格.

英文摘要:

The galactic 511 keV gamma-ray line has been observed since 1970's, and was identified as the result of electron-positron annihilation, but the origin of such positrons is still not clear. Apart from the astrophysical explanations, the possibilities that such positrons come from dark matter (DM) annihilation are also widely studied. Primordial black hole (PBH) is also an extensively studied candidate of DM. If PBHs exist, the DM particles may be gravitationally bound to the PBHs and form halo around PBHs with density spikes. DM annihilation in these density spikes can enhance the production rate of positrons from DM particles, but the signal morphology is similar to the decaying DM. We consider such a mixed model consisting of DM particles and PBHs and obtain the upper limit from the data of 511 keV gamma-ray line from INTEGRAL/SPI on the decaying component of DM particles and the constraint on the PBH abundance. These constraints are general and independent of particle DM models. For the mixed model consisting of excited DM and PBHs, the constraints on the PBH abundance can be down to $O(10^{-17})$ for DM particle with mass around $1~\mathrm{TeV}$, which is more stringent than that obtained from the extragalactic gamma-ray background.

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