论文标题
来自Fornax球状聚类时机的暗物质特性：动力摩擦和芯片轮廓
Dark matter properties from the Fornax globular cluster timing: dynamical friction and cored profiles
论文作者
论文摘要
我总结了我们最近的结果，在Fornax Dwarf球形（DSPH）星系中使用球形簇（GC）的轨道以了解有关暗物质（DM）特性的更多信息。我们的重点是阐明从DM光环中的动力学摩擦（DF）如何从DM的不同显微镜特性中修改，这可能会改变$ $ $ $ $ $ $ $ $ $的散射过程DF和DM配置文件（特别是生成核心），这也修改了DF。我们考虑：$（i）$ fermionic变性暗物质（DDM），在动态摩擦计算中应考虑保利的阻塞； $（ii）$自我互动暗物质（SIDM）和$（iii）$ Ultralight暗物质（ULDM），最近文献中各种方法解决了这个问题。我们以Fokker-Planck形式主义得出了DF，从而再现了ULDM和Cold DM的先前结果，同时为DDM提供了新的结果。此外，ULDM，DDM和SIDM可能会在DSPHS中产生核心，从而抑制动态摩擦和延长的GC轨道。我们得出的结论是，在所有这些情况下，DM建模中的修改并不容易解决所谓的Fornax GC的时序“问题”。我们最终根据初始条件研究了这个“问题”，这表明观察到的Fornax GC的轨道与cuspy dm概况的这种期望是一致的，其在$ \ sim25 \％$的水平上具有轻度的“微调”。
I summarize our recent results to use the orbits of globular clusters (GCs) in the Fornax dwarf spheroidal (dSph) galaxy to learn more about dark matter (DM) properties. Our focus is on clarifying how dynamical friction (DF) from the DM halo is modified from the different microscopic properties of DM, which may alter $both$ the scattering processes responsible of DF and the DM profiles (in particular generating a core), which also modifies DF. We consider: $(i)$ fermionic degenerate dark matter (DDM), where Pauli blocking should be taken into account in the dynamical friction computation; $(ii)$ self-interacting dark matter (SIDM) and $(iii)$ ultralight dark matter (ULDM), for which this problem has been addressed by a variety of methods in recent literature. We derive DF with a Fokker-Planck formalism, reproducing previous results for ULDM and cold DM, while providing new results for DDM. Furthermore, ULDM, DDM and SIDM may generate cores in dSphs, which suppress dynamical friction and prolong GC orbits. We conclude that in all these cases the modifications in the DM modelling does not easily solve the so-called timing `problem' of Fornax GCs. We finally study this `problem' in terms of the initial conditions, demonstrating that the observed orbits of Fornax GCs are consistent with this expectation of a cuspy DM profile with a mild `fine-tuning' at the level of $\sim25\%$.
