论文标题
研究暗物质螺旋散射的CMB约束
Investigation of CMB constraints for dark matter-helium scattering
论文作者
论文摘要
我们研究早期宇宙中的暗物质螺旋散射及其对宇宙微波背景（CMB）各向异性测量的影响。我们描述了通过标量，伪级或矢量介体进行暗物质核子相互作用的理论框架。这种相互作用会引起氢和氦散射，其横截面具有幂律对相对速度的依赖性。在这些框架内，我们考虑了三种情况：仅与中子，仅质子以及具有均等强度的中子和质子的暗物质耦合。在这些情况下，我们使用\ textit {planck} 2018温度，极化和镜头各向异性数据在10 keV和1 TEV之间使用氢和/或氦气对暗物质散射的约束。对于任何允许具有非负幂律速度依赖性的氦气和氢散射的模型，我们发现氦散射占主导地位的暗物质质量的约束。此外，我们将第一个CMB约束放在暗物质上，在早期宇宙中占据氦气占主导地位/独家。
We study dark matter-helium scattering in the early Universe and its impact on constraints from cosmic microwave background (CMB) anisotropy measurements. We describe possible theoretical frameworks for dark matter-nucleon interactions via a scalar, pseudoscalar, or vector mediator; such interactions give rise to hydrogen and helium scattering, with cross sections that have a power-law dependence on relative velocity. Within these frameworks, we consider three scenarios: dark matter coupling to only neutrons, to only protons, and to neutrons and protons with equal strength. For these various cases, we use \textit{Planck} 2018 temperature, polarization, and lensing anisotropy data to place constraints on dark matter scattering with hydrogen and/or helium for dark matter masses between 10 keV and 1 TeV. For any model that permits both helium and hydrogen scattering with a non-negative power-law velocity dependence, we find that helium scattering dominates the constraint for dark matter masses well above the proton mass. Furthermore, we place the first CMB constraints on dark matter that scatters dominantly/exclusively with helium in the early Universe.
