Aspects of very massive dark matter

科学背景：***早期宇宙中暗物质热生成的要求将暗物质（DM）粒子的质量与DM与重子物质的耦合强度联系起来。在共振区域之外（DM产生的共振增强出现，例如希格斯入口暗物质的DM质量接近63gev），更重的DM粒子的产生需要更高的重子物质耦合强度。我们发现玻色子希格斯入口暗物质的耦合常数在几TeV质量范围内将变为非微扰（详情请参阅完整提案）。热DM生成的耦合强度随质量的增加而增加是一个普遍现象。然而，与重子物质具有非微扰耦合强度的隐藏扇区由于抑制了反冲和湮灭截面的质量，仍然提供了可行的DM模型。另一方面，目前正在进行的直接搜索实验，如DEAP-3600和XENON1T，以及即将进行的LZ实验，将对多tev的暗物质质量范围敏感。因此，发展理论技术来预测非摄动状态下的DM湮灭和核反冲截面是非常重要的。***拟议研究项目的目标：***我们的目标是开发高质量暗物质部门的非微扰技术，将实验观测结果与多tev质量范围的模型进行比较。我们的目标是对湮灭横截面（对热产生和间接暗物质搜索的平衡方程很重要）、核反冲横截面（对高质量范围敏感的直接搜索实验很重要）以及大型强子对撞机和轻子对撞机的生产横截面做出理论预测。***研究项目的影响和后果：***目前正在进行或即将进行的直接搜索实验开始探索多tev暗物质质量范围是非常令人兴奋的，这使得该研究项目非常及时地从理论方面提供支持，并将实验结果与暗物质模型联系起来。我们预计，将直接搜索实验的发现与理论模型联系起来将是该项目的主要推动力和影响。然而，我们也希望需要从暗物质的一面解决非微扰模型，作为强子物理的补充动机，将反馈到提高对非微扰场论的一般理解，也将有助于提高我们对强子物理的理解。***加拿大人对前沿知识的研究有着浓厚的兴趣，通过国家实验室的设施和实验的支持，加拿大对世界一流的贡献感到非常自豪。暗物质模型的理论分析为这些努力提供了重要的支持

Scientific background:***The requirement of thermal creation of dark matter in the early universe relates the mass of dark matter (DM) particles with the DM coupling strength to baryonic matter. Outside of resonance regions (resonant enhancement of DM creation appears e.g. for DM masses near 63 GeV for Higgs portal dark matter), the creation of heavier DM particles requires higher coupling strength to baryonic matter. We find that the coupling constant for bosonic Higgs portal dark matter will become non-perturbative in the several TeV mass range (please see full proposal for details). Increasing coupling strength with increasing mass for thermal DM creation is a generic phenomenon. However, hidden sectors with non-perturbative coupling strength to baryonic matter still provide viable DM models due to suppression of recoil and annihilation cross sections with mass. On the other hand, currently starting direct search experiments like DEAP-3600 and XENON1T, as well as the upcoming LZ experiment, will be sensitive to the multi-TeV dark matter mass range. Therefore it is very important to develop theoretical techniques to make predictions for DM annihilation and nuclear recoil cross sections also in the non-perturbative regime. ***Objectives of the proposed research project:***Our objective is to develop non-perturbative techniques for the high mass dark matter sector, to compare experimental observations with models in the multi-TeV mass range. Our aim is to make theoretical predictions for annihilation cross sections (important for balance equations for thermal creation and for indirect dark matter search), for nuclear recoil cross sections (important for direct search experiments which will be sensitive to the high mass range), and for production cross sections at the LHC and at lepton colliders.***Implications and ramifications of the research project:***The start of the exploration of the multi-TeV dark matter mass range with currently starting or upcoming direct search experiments is extremely exciting and makes this research project very timely to offer support from the theory side, and to connect the findings of the experiments with dark matter models. We anticipate that connecting the findings from the direct search experiments with theoretical models will be the main thrust and impact of the project. However, we are also hopeful that the need to address non-perturbative models from a dark matter side, as a complementary motivation to hadronic physics, will feed back into an improved general understanding of non-perturbative field theories and will also help to improve our understanding of hadronic physics. ***Canadians have a keen interest in research at the frontier of knowledge and take great pride in Canada's world-class contributions through the support of the facilities and experiments at national labs. Theoretical analysis of dark matter models provides important support for these endeavors.**