论文标题
在自我相互作用的暗物质光环和间接检测约束的黑孔附近密度尖峰
Density spikes near black holes in self-interacting dark matter halos and indirect detection constraints
论文作者
论文摘要
自相互作用的暗物质（SIDM）自然会产生一个核等热密度曲线，这在观察许多矮星系中受到青睐。在等温光晕中存在中央黑洞的暗物质分布会以$ r^{ - 7/4} $的功率定律形成密度尖峰，该法比预期的无碰撞暗物质（CDM）较浅。因此，可以在SIDM中放松对暗物质歼灭的间接检测约束。以银河系德拉科（Draco）的最密集的卫星星系为例，我们在SIDM和CDM Halos的an灭横截面和黑洞质量上得出了上限。对于前一种情况，即使暗物质是由热物构成的，Draco也可以容纳一个中间质量的黑洞。我们进一步探讨了带有超级质量黑洞的银河系和M87的限制，并在SIDM中显示了歼灭横截面上的上限。我们的结果还表明，事件范围望远镜可以提供SIDM尖峰的独特测试。
Self-interacting dark matter (SIDM) naturally gives rise to a cored isothermal density profile, which is favored in observations of many dwarf galaxies. The dark matter distribution in the presence of a central black hole in an isothermal halo develops a density spike with a power law of $r^{-7/4}$, which is shallower than $r^{-7/3}$ as expected for collisionless dark matter (CDM). Thus, indirect detection constraints on dark matter annihilations from the density spike could be relaxed in SIDM. Taking the most dense satellite galaxy of the Milky Way Draco as an example, we derive upper limits on the annihilation cross section and the black hole mass for both SIDM and CDM halos. For the former case, Draco could host an intermediate mass black hole even if dark matter is composed of thermal relics. We further explore the constraints from the Milky Way and M87, which host supermassive black holes, and show the upper limits on the annihilation cross section are significantly weakened in SIDM. Our results also indicate that the Event Horizon Telescope could provide a unique test of SIDM spikes.
