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Disruption of Dark Matter Minihalos in the Milky Way Environment: Implications for Axion Miniclusters and Early Matter Domination

ASTROPHYSICAL JOURNAL(2024)

CALTECH | Washington Univ | Walter Burke Inst Theoret Phys

Cited 0|Views36
Abstract
Many theories of dark matter beyond the weakly interacting massive particles paradigm feature an enhanced matter power spectrum on subparsec scales, leading to the formation of dense dark matter minihalos. Future local observations are promising to search for and constrain such substructures. The survival probability of these dense minihalos in the Milky Way environment is crucial for interpreting local observations. In this work, we investigate two environmental effects: stellar disruption and (smooth) tidal disruption. These two mechanisms are studied using semianalytic models and idealized N -body simulations. For stellar disruption, we perform a series of N -body simulations of isolated minihalo–star encounters to test and calibrate analytic models of stellar encounters before applying the model to the realistic Milky Way disk environment. For tidal disruption, we perform N -body simulations to confirm the effectiveness of the analytic treatment. Finally, we propose a framework to combine the hierarchical assembly and infall of minihalos to the Milky Way with the late-time disruption mechanisms. We make predictions for the mass functions of minihalos in the Milky Way. The mass survival fraction (at M _mh ≥ 10 ^−12 M _⊙ ) of dense dark matter minihalos, e.g., for axion miniclusters and minihalos from early matter domination, is ∼60% with the relatively low-mass, compact population surviving. The survival fraction is insensitive to the detailed model parameters. We discuss various implications of the framework and future direct detection prospects.
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要点】:本研究探讨了在银河系环境中,恒星扰动和光滑潮汐扰动对密集暗物质微晕的影响,并提出了一种结合微晕在银河系中的层次组装和晚期扰动机制的预测框架,对于axion微团簇和早期物质主导的微晕的生存率进行了评估。

方法】:研究使用了半解析模型和理想的N体模拟。对于恒星扰动,通过一系列N体模拟孤立微晕-恒星遭遇来测试和校准恒星遭遇的解析模型,然后将该模型应用于真实的银河系盘环境。对于潮汐扰动,通过N体模拟来验证解析处理的有效性。

实验】:研究预测了银河系中微晕的质量函数。在M mh >= 10^-12 M_circle dot的密集暗物质微晕(例如axion微团簇和早期物质主导的微晕)的生存率约为60%,相对低质量的紧凑群体幸存。生存率对详细模型参数不敏感。