AI 中文总结
本文通过粒子-in-cell模拟研究银河系内暗物质亚晕静电不稳定性的非线性演化，发现不稳定性引发的加热与质量损失效率依赖亚晕质量和轨道偏心率，或可解释低质量亚晕质量函数的抑制。
AI 中文摘要
通过长程力发生自相互作用的暗物质会表现出短程相互作用中不存在的相干集体效应。若暗物质通过暗光子中介发生相互作用，其动力学与标准模型等离子体极为相似。在这类模型中，包括星系团碰撞、绕主晕运行的亚晕在内的多种天体物理环境，都易受等离子体不稳定性影响，该过程会改变暗物质速度分布，导致暗电磁场指数增长。本文采用一套粒子-in-cell模拟，首次对绕银河系引力势运行的暗物质亚晕中静电不稳定性的非线性演化展开研究。研究发现，这些不稳定性的增长与饱和会产生显著的湍流加热和质量损失，其效率对亚晕质量和轨道偏心率敏感依赖。对于高偏心率轨道，等离子体加热可使10^7（10^9）太阳质量亚晕在首次近心点后不久，初始质量减少约97%（约84%）。因此，等离子体诱导的加热与剥离可能在银河系亚晕群中留下可观测特征，包括低质量亚晕质量函数的抑制。
英文摘要
Dark matter that self interacts through long-range forces exhibits coherent, collective effects that are absent in short-range interactions. In the case where dark matter interacts through a hidden-photon mediator, its dynamics closely resemble those of Standard Model plasmas. In such models, various astrophysical environments, including cluster collisions and subhalos orbiting their host halo, are susceptible to plasma instabilities: processes that modify the dark matter velocity distribution and lead to exponential growth of dark electromagnetic fields. In this paper, we present the first study of the non-linear evolution of electrostatic instabilities in dark matter subhalos orbiting within the Milky Way potential using a suite of particle-in-cell simulations. We find that the growth and saturation of these instabilities produce substantial turbulent heating and mass loss, with an efficiency that depends sensitively on subhalo mass and orbital eccentricity. For highly eccentric orbits, plasma heating can reduce the initial mass of a $10^7$ ($10^9$) $\text{M}_\odot$ subhalo by as much as $\sim 97\%$ ($\sim 84\%$) soon after first pericenter. Plasma-induced heating and stripping may therefore leave observable signatures in the Milky Way subhalo population, including a suppression of the low-mass subhalo mass function.
Comments13+3 pages, 4+2 figures. Code available at https://github.com/aprabhu94/dark-plasma-subhalos
