用PandaX- II全数据集约束自相互作用暗物质
Constraining self-interacting dark matter with the full dataset of PandaX-II
摘要：
自相互作用暗物质（SIDM）是一个领先的候选人提出解决流行的冷暗物质理论的预测和星系的观测之间的差异。许多SIDM模型预测存在一个光的力量载体，介导强暗物质自相互作用。如果介质耦合到标准模型粒子，它可以在暗物质直接探测实验中产生特征信号。我们报告使用PandaX-II实验的完整数据集搜索具有光介体的SIDM模型，基于132吨-天的总暴露量。没有发现明显超过背景，我们的可能性分析导致一个强大的上限的暗物质-核子耦合强度。我们进一步结合PandaX-II约束和早期宇宙中轻元素丰度的观测，并表明直接探测和宇宙学探测可以提供互补的约束暗物质模型与光介质。
英文摘要：
Self-interacting Dark Matter (SIDM) is a leading candidate proposed to solve discrepancies between predictions of the prevailing cold dark matter theory and observations of galaxies. Many SIDM models predict the existence of a light force carrier that mediate strong dark matter self-interactions. If the mediator couples to the standard model particles, it could produce characteristic signals in dark matter direct detection experiments. We report searches for SIDM models with a light mediator using the full dataset of the PandaX-II experiment, based on a total exposure of 132 tonne-days. No significant excess over background is found, and our likelihood analysis leads to a strong upper limit on the dark matter-nucleon coupling strength. We further combine the PandaX-II constraints and those from observations of the light element abundances in the early universe, and show that direct detection and cosmological probes can provide complementary constraints on dark matter models with a light mediator.
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