标题： 通过质量分离在两组分自相互作用暗物质模型中多样化晕结构 显示英文标题

标题： Diversifying halo structures in two-component self-interacting dark matter models via mass segregation

摘要： 自相互作用暗物质（SIDM）通过由弹性自散射驱动的重力热演化，为观察到的内部晕密度的多样性提供了一个有说服力的解释。 在本研究中，我们研究了一种质量比为同一数量级的两组分暗物质模型中的SIDM动力学，这一模型受到不对称暗物质框架的启发，可以自然地避开残留丰度和媒介子衰变的约束，同时实现强的、与速度相关的自相互作用。 我们表明，跨组分的散射显著增强了质量分离，促使形成致密的、类似核心坍缩的晕。 这种效应自然地与SIDM引起的多样性相结合，引入了一种生成结构变化的新机制，超越了仅由重力热演化产生的变化。 我们的结果揭示了一种新的机制，通过允许中心密度的变化来调和SIDM与小尺度观测矛盾，同时保持生成多样化晕结构的灵活性。 我们进一步指出，晕结构的多样性可能作为暗物质成分的诊断工具，为SIDM的粒子性质开辟了一个新的观测窗口。 显示英文摘要

摘要： Self-interacting dark matter (SIDM), through gravothermal evolution driven by elastic self-scatterings, offers a compelling explanation for the observed diversity of inner halo densities. In this work, we investigate SIDM dynamics in a two-component dark matter model with mass ratios of order unity, motivated by an asymmetric dark matter framework that naturally evades constraints from relic abundance and mediator decay, while enabling strong, velocity-dependent self-interactions. We show that cross-component scatterings significantly enhance mass segregation, driving the formation of dense, core collapsed-like halos. This effect couples naturally to SIDM-induced diversity, introducing a new mechanism for generating structural variations beyond those arising from gravothermal evolution alone. Our results reveal a novel mechanism for reconciling SIDM with small-scale observational tensions by enabling shifts in central densities while preserving the flexibility to generate diverse halo structures. We further highlight that halo structural diversity may serve as a diagnostic of dark sector composition, opening a new observational window into the particle nature of SIDM.