论文标题
建模自相互作用的暗物质子结构i：用乳白色大小的光晕及其卫星的N体模拟校准
Modelling self-interacting dark matter substructures I: Calibration with N-body simulations of a Milky-Way-sized halo and its satellite
论文作者
论文摘要
我们研究了单个子哈洛斯的演变，它们的质量为$ \ sim10^9 m_ \ odot $在乳白色大小的宿主光环中用于自我相互作用的暗物质（SIDM）模型。我们通过改变自散射的横截面（包括速度依赖性场景），subhalo orbits和subhalo的内部特性来执行单个亚乳子的动力学演化的仅黑色N体模拟。我们校准了一个类别的晶状体流体模型，以预测与模拟的分离的SIDM光环的球形质量密度曲线的时间演化。我们发现，可以用针对无碰撞的冷暗物质（CDM）开发的框架来描述Sidm subhaloes的潮汐效应，但是需要潮汐剥离引起的质量损失的典型时间尺度较短，以解释我们的SIDM仿真结果。 As long as the cross section is less than $\sim10\, \mathrm{cm}^2/\mathrm{g}$ and initial states of subhaloes are set within a $2σ$-level scatter at redshifts of $\sim2$ predicted by the standard $Λ$CDM cosmology, our simulations do not exhibit a prominent feature of gravothermal collapse in the subhalo central density for 10 Gyr。我们开发了一个在宿主的随着时间变化密度核心的SIDM亚李的半分析模型，具有潮汐剥离和自散射的RAM压力效应。我们的半分析方法提供了对Sidm subhaloes的简单，高效且身体直觉的预测，但是需要进一步的改进，以说明宿主中的男性效应以及通过潮汐剥离效应加速的重生不稳定。
We study evolution of single subhaloes with their masses of $\sim10^9 M_\odot$ in a Milky-Way-sized host halo for self-interacting dark matter (SIDM) models. We perform dark-matter-only N-body simulations of dynamical evolution of individual subhaloes orbiting its host by varying self-scattering cross sections (including a velocity-dependent scenario), subhalo orbits, and internal properties of the subhalo. We calibrate a gravothermal fluid model to predict time evolution in spherical mass density profiles of isolated SIDM haloes with the simulations. We find that tidal effects of SIDM subhaloes can be described with a framework developed for the case of collision-less cold dark matter (CDM), but a shorter typical time scale for the mass loss due to tidal stripping is required to explain our SIDM simulation results. As long as the cross section is less than $\sim10\, \mathrm{cm}^2/\mathrm{g}$ and initial states of subhaloes are set within a $2σ$-level scatter at redshifts of $\sim2$ predicted by the standard $Λ$CDM cosmology, our simulations do not exhibit a prominent feature of gravothermal collapse in the subhalo central density for 10 Gyr. We develop a semi-analytic model of SIDM subhaloes in a time-evolving density core of the host with tidal stripping and self-scattering ram pressure effects. Our semi-analytic approach provides a simple, efficient and physically-intuitive prediction of SIDM subhaloes, but further improvements are needed to account for baryonic effects in the host and the gravothermal instability accelerated by tidal stripping effects.
