论文标题
轴承暗物质团块的共振不稳定性
Resonant instability of axionic dark matter clumps
论文作者
论文摘要
Axion是暗物质颗粒的流行候选人。轴子暗物质可能会形成玻色的凝结物，并可能在重力上结合形成轴突块。在具有频率$ω= m_ {a}/2 $的电磁波的存在下，其中$ m_ {a} $是轴质量，可能会发生谐振剂增强，从而导致轴支块的不稳定性。通过分析和数值方法，我们研究了具有无限均匀质量分布的轴基暗物质团块的共振不稳定性，以及具有有限边界的分布。在考虑了现实的天体物理环境（包括重力红移和等离子效应）之后，我们在带有给定的质量和轴耦合的轴法密度紧紧束大小参数空间中获得了一个不稳定性区域。特别是，我们表明，对于QCD轴在平衡中形成的轴突，不会发生共振的不稳定性。
Axion is a popular candidate for dark matter particles. Axionic dark matter may form Bose-Einstein condensate and may be gravitationally bound to form axion clumps. Under the presence of electromagnetic waves with frequency $ω=m_{a}/2$, where $m_{a}$ is the axion mass, a resonant enhancement may occur, causing an instability of the axion clumps. With analytical and numerical approaches, we study the resonant instability of axionic dark matter clumps with infinite homogeneous mass distribution, as well as distribution with a finite boundary. After taking realistic astrophysical environments into consideration, including gravitational redshift and plasma effects, we obtain an instability region in the axion density-clump size parameter space with given mass and coupling of axions. In particular, we show that, for axion clumps formed by the QCD axions in equilibrium, no resonant instability will occur.
