Comparing implementations of self-interacting dark matter in the gizmo and arepo codes
Comparing implementations of self-interacting dark matter in the gizmo and arepo codes
复制标题
比较 Gizmo 和 Arepo 代码中自相互作用暗物质的实现
DOI：
10.1093/mnras/stac1056
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发表时间：
2022
影响因子：
4.8
通讯作者：
Weatherall, James O.
中科院分区：
文献类型：
--
作者：
Meskhidze, Helen;Mercado, Francisco J.;Sameie, Omid;Robles, Victor H.;Bullock, James S.;Kaplinghat, Manoj;Weatherall, James O.
自相互作用暗物质（SIDM）模型作为解决天体物理学小尺度难题的方法，在过去的十年中受到了极大的关注。虽然在结构形成的n体编码中存在暗物质（DM）自相互作用的不同实现，但尚未有系统的研究来比较这些不同实现的预测。我们研究了两个模拟代码：gizmoandarepo中暗物质自相互作用的实现。我们从一个孤立的1010M⊙暗物质晕的相同初始条件开始，研究了在质量为1、5和50时SIDM横截面的密度和速度色散曲线的演化。我们的测试仅限于核心膨胀阶段，在这个阶段，核心密度随着时间的推移而下降，核心半径随着时间的推移而增加。我们发现，在这一演化阶段，密度剖面的代码之间的一致性超过30%，在更高的分辨率下，一致性得到改善。我们发现，在收敛半径之外，不同代码特定的SIDM参数对中心光晕密度的影响小于10%。我们认为，在两种不同的方案中，SIDM岩芯形成是稳健的，并得出结论，这些代码可以可靠地区分1、5和50的横截面，但更精细的区分需要进一步的研究。
Self-interacting dark matter (SIDM) models have received great attention over the past decade as solutions to the small-scale puzzles of astrophysics. Though there are different implementations of dark matter (DM) self-interactions in N-body codes of structure formation, there has not been a systematic study to compare the predictions of these different implementations. We investigate the implementation of dark matter self-interactions in two simulation codes:gizmoandarepo. We begin with identical initial conditions for an isolated 1010M⊙dark matter halo and investigate the evolution of the density and velocity dispersion profiles ingizmoandarepofor SIDM cross-section over mass of 1, 5, and 50. Our tests are restricted to the core expansion phase, where the core density decreases and core radius increases with time. We find better than 30 per cent agreement between the codes for the density profile in this phase of evolution, with the agreement improving at higher resolution. We find that varying code-specific SIDM parameters changes the central halo density by less than 10 per cent outside of the convergence radius. We argue that SIDM core formation is robust across the two different schemes and conclude that these codes can reliably differentiate between cross-sections of 1, 5, and 50, but finer distinctions would require further investigation.