论文标题
银河系丰度的速度依赖性暗物质 - 普罗顿散射的界限
Bounds on velocity-dependent dark matter-proton scattering from Milky Way satellite abundance
论文作者
论文摘要
我们使用从黑暗能源调查和Pan-Starrs1的银河系卫星种群的最新测量值来推断迄今为止在暗物质粒子和质子之间速度依赖性相互作用上的最严格的天体物理。我们将动量转移横截面建模为相对粒子速度$ v $的功率定律，并具有自由归一化振幅，$σ_\ text {mt} =σ_0v^n $，以广泛捕获在暗物质 - 散射的非相关性有效理论中产生的相互作用。散射会导致早期宇宙中巴属和暗物质流体之间的动力和热传递，最终在小物理尺度上擦除结构，并减少今天托有矮人星系的低质量光环。从观察到与冷碰撞无碰撞暗物质范式的一致性，使用一种依赖于线性扰动理论的最强预测的新方法，我们推断出上限的上限$σ_0$ $ 1.4 \ times10^{ - 23} $，$ 23} $，$ 2.1 \ Mathrm {cm}^2 $，用于$ n = 2,4,6 $的交互模型，对于暗物质粒子质量为$ 10 \ \ \ \ mathrm {mev} $。这些结果改善了对暗物质的观察限制 - 逐数量的散射，因此为可行的子GEV候选物提供了重要的指南。
We use the latest measurements of the Milky Way satellite population from the Dark Energy Survey and Pan-STARRS1 to infer the most stringent astrophysical bound to date on velocity-dependent interactions between dark matter particles and protons. We model the momentum-transfer cross section as a power law of the relative particle velocity $v$ with a free normalizing amplitude, $σ_\text{MT}=σ_0 v^n$, to broadly capture the interactions arising within the non-relativistic effective theory of dark matter-proton scattering. The scattering leads to a momentum and heat transfer between the baryon and dark matter fluids in the early Universe, ultimately erasing structure on small physical scales and reducing the abundance of low-mass halos that host dwarf galaxies today. From the consistency of observations with the cold collisionless dark matter paradigm, using a new method that relies on the most robust predictions of the linear perturbation theory, we infer an upper limit on $σ_0$ of $1.4\times10^{-23}$, $2.1\times10^{-19}$, and $1.0\times10^{-12}\ \mathrm{cm}^2$, for interaction models with $n=2,4,6$, respectively, for a dark matter particle mass of $10\ \mathrm{MeV}$. These results improve observational limits on dark matter--proton scattering by orders of magnitude and thus provide an important guide for viable sub-GeV dark matter candidates.
