论文标题
对暗物质颗粒的混合模型和来自银河系511 kev系的原始黑洞的混合模型的约束
Constraints on a mixed model of dark matter particles and primordial black holes from the Galactic 511 keV line
论文作者
论文摘要
自1970年代以来，已经观察到了银河511 kev伽马射线线，并被确定为电子峰值歼灭的结果，但是这种正电子的起源仍不清楚。除了天体物理的解释外，此类原位来自暗物质（DM）歼灭的可能性也得到了广泛的研究。原始黑洞（PBH）也是DM的广泛研究的候选者。如果存在PBH，则DM颗粒可以重力与PBHS结合，并在PBH周围形成光环，并具有密度尖峰。这些密度尖峰中的DM歼灭可以提高DM颗粒的正上子的产生速率，但是信号形态与衰减的DM相似。我们考虑了由DM颗粒和PBHs组成的混合模型，并从511 KeV伽马射线线的数据中获得上限，从积分/SPI的DM颗粒的衰减成分以及PBH丰度的约束。这些约束是一般的，独立于粒子DM模型。对于由激发的DM和PBH组成的混合模型，对于DM粒子，PBH丰度上的约束可以降低到$ O（10^{ - 17}）$，质量约为$ 1〜 \ Mathrm {Tev} $，这比从外层状Gamma-ray背景中获得的更为严格。
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.
