The distinctive effects of fuzzy dark matter are most visible at non-linear galactic scales. We present the first simulations of mixed fuzzy and cold dark matter, obtained with an extended version of the {Nyx} code. Fuzzy (or ultralight, or axion-like) dark matter dynamics are governed by the comoving Schr"odinger-Poisson equation. This is evolved with a pseudospectral algorithm on the root grid, and with finite differencing at up to six levels of adaptive refinement. Cold dark matter is evolved with the existing N-body implementation in {Nyx}. We present the first investigations of spherical collapse in mixed dark matter models, focusing on radial density profiles, velocity spectra and soliton formation in collapsed halos. We find that the effective granule masses decrease in proportion to the fraction of fuzzy dark matter which quadratically suppresses soliton growth, and that a central soliton only forms if the fuzzy dark matter fraction is greater than 10%. The {Nyx} framework supports baryonic physics and key astrophysical processes such as star formation. Consequently, {AxioNyx} will enable increasingly realistic studies of fuzzy dark matter astrophysics.

中文翻译：

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模拟模糊和冷暗物质的混合

在非线性星系尺度上，模糊暗物质的独特作用最为明显。我们介绍了使用扩展版本的{Nyx}代码获得的混合模糊和冷暗物质的第一个模拟。模糊（或超轻或类似轴突）的暗物质动力学由共同移动的Schr“ odinger-Poisson方程控制。这是通过在根网格上使用伪光谱算法进行演化的，并且在多达六个自适应调整级别上具有有限差分。 {Nyx}中现有的N体实现使冷暗物质得以演化，我们对混合暗物质模型中的球形塌陷进行了首次研究，重点是径向密度剖面，速​​度谱和塌陷晕中的孤子形成。我们发现有效颗粒质量与模糊暗物质的比例成比例地降低，从而二次抑制了孤子的生长，只有模糊暗物质的比例大于10％时，才会形成中心孤子。{Nyx}框架支持重子物理学和关键的天体物理过程，例如恒星形成。因此，{AxioNyx}将使模糊暗物质天体物理学的研究越来越现实。