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Resonant instability of axionic dark matter clumps
Journal of Cosmology and Astroparticle Physics ( IF 6.4 ) Pub Date : 2020-07-15 , DOI: 10.1088/1475-7516/2020/07/038 Zihang Wang 1, 2 , Lijing Shao 2 , Li-Xin Li 2
Journal of Cosmology and Astroparticle Physics ( IF 6.4 ) Pub Date : 2020-07-15 , DOI: 10.1088/1475-7516/2020/07/038 Zihang Wang 1, 2 , Lijing Shao 2 , Li-Xin Li 2
Affiliation
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 $\omega=m_{a}/2$, 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.
中文翻译:
轴离子暗物质团块的共振不稳定性
Axion 是暗物质粒子的热门候选者。轴子暗物质可能会形成玻色-爱因斯坦凝聚,并可能在引力作用下形成轴子团块。在频率为 $\omega=m_{a}/2$ 的电磁波的存在下,其中 $m_{a}$ 是轴子质量,可能会发生共振增强,导致轴子团块不稳定。通过解析和数值方法,我们研究了具有无限均匀质量分布以及具有有限边界分布的轴离子暗物质团块的共振不稳定性。在考虑了现实的天体物理环境后,包括引力红移和等离子体效应,我们在轴子密度-团块大小参数空间中获得了一个不稳定区域,其具有给定的质量和轴子耦合。特别地,我们表明,
更新日期:2020-07-15
中文翻译:
轴离子暗物质团块的共振不稳定性
Axion 是暗物质粒子的热门候选者。轴子暗物质可能会形成玻色-爱因斯坦凝聚,并可能在引力作用下形成轴子团块。在频率为 $\omega=m_{a}/2$ 的电磁波的存在下,其中 $m_{a}$ 是轴子质量,可能会发生共振增强,导致轴子团块不稳定。通过解析和数值方法,我们研究了具有无限均匀质量分布以及具有有限边界分布的轴离子暗物质团块的共振不稳定性。在考虑了现实的天体物理环境后,包括引力红移和等离子体效应,我们在轴子密度-团块大小参数空间中获得了一个不稳定区域,其具有给定的质量和轴子耦合。特别地,我们表明,