论文标题
暗物质衰变下矮晕密度的变形
Metamorphosis of dwarf halo density profile under dark matter decays
论文作者
论文摘要
我们使用一种新的算法将光环密度曲线降低到最内向的$ 700 $ PC以高效的效率，使用新的算法研究了衰减的暗物质（DDM）宇宙学中矮晕的密度曲线。遵循Schwarzschild的基于轨道的方法，我们还开发了一个简化的模型来计算DDM光晕密度曲线，这与N体模拟中的模型非常吻合。缩放模拟和简化的模型都表明，暗物质衰减导致中央密度的变平和矮晕密度的总体降低，并且通过简化模型很好地说明了基本的物理机制。 DDM矮晕缓慢升高的缩放旋转曲线与局部矮星系的观察一致。我们的结果表明，DDM具有解决冷暗物质（CDM）模型面临的小规模问题的巨大潜力。
We study the density profile of a dwarf halo in the decaying dark matter (DDM) cosmology, using a new algorithm that resolves halo density profiles down to the innermost $700$ pc robustly with high efficiency. Following Schwarzschild's orbit-based method, we have also developed a simplified model to calculate the DDM halo density profiles, which agree remarkably well with those from N-body simulations. Both zoom-in simulations and the simplified model reveal that dark matter decays lead to the flattening of central density and overall reduction of density in dwarf halos, and the underlying physics mechanisms are well illustrated by the simplified model. The slowly-rising scaled rotation curves of DDM dwarf halos agree with the observation of local dwarf galaxies. Our results suggest that the DDM holds great potential for resolving the small-scale problems faced by the cold dark matter (CDM) model.
