论文标题
电子后坐力实验中的宇宙学和次MEV暗物质的前景
Cosmology and prospects for sub-MeV dark matter in electron recoil experiments
论文作者
论文摘要
暗物质受到低于1 MEV的直接检测实验的限制不大。这是下一代实验的重要目标，已经提出了几种探测此质量范围的方法。一类此类实验将寻找暗物质 - 电子后坐力。但是，具有与电子相连的新自由度的简化模型面临着宇宙学的巨大压力，并且更广泛地了解了这些限制的程度。在这里，我们在有效的田间理论的背景下对具有沉重的调解人的模型进行了对宇宙学约束的系统研究。我们包括（i）原始核合成的破坏，（ii）暗物质的过度生产以及（iii）重组时中微子物种的有效数量。我们证明了结果对提出的电子后坐力实验的含义，并突出了可能可直接检测的情况。
Dark matter is poorly constrained by direct detection experiments at masses below 1 MeV. This is an important target for the next generation of experiments, and several methods have been proposed to probe this mass range. One class of such experiments will search for dark matter--electron recoils. However, simplified models with new light degrees of freedom coupled to electrons face significant pressure from cosmology, and the extent of these restrictions more generally is poorly understood. Here, we perform a systematic study of cosmological constraints on models with a heavy mediator in the context of an effective field theory. We include constraints from (i) disruption of primordial nucleosynthesis, (ii) overproduction of dark matter, and (iii) the effective number of neutrino species at recombination. We demonstrate the implications of our results for proposed electron recoil experiments, and highlight scenarios which may be amenable to direct detection.
