Aspects of very massive dark matter

科学背景： 早期宇宙中暗物质热产生的要求将暗物质粒子的质量与暗物质与重子物质的耦合强度联系起来。在共振区域之外（例如，希格斯门暗物质的DM质量接近63 GeV时，DM产生的共振增强出现），较重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门暗物质的耦合常数将在几TeV的质量范围内变得非微扰（请参阅完整的提案以了解详细信息）。随着热DM产生的质量增加而增加耦合强度是一种普遍现象。然而，由于反冲和湮灭截面与质量的抑制，具有非微扰耦合强度的重子物质的隐藏扇区仍然提供可行的DM模型。另一方面，目前开始的直接搜索实验，如DEAP-3600和XENON 1 T，以及即将到来的LZ实验，将对多TeV的暗物质质量范围敏感。因此，发展理论方法来预测非微扰区的DM湮没和核反冲截面是非常重要的。 拟议研究项目的目标： 我们的目标是开发非微扰技术的高质量的暗物质部门，比较实验观测模型在多TeV的质量范围。我们的目标是使理论预测湮灭截面（重要的平衡方程的热创造和间接的暗物质搜索），核反冲截面（重要的直接搜索实验，这将是敏感的高质量范围），生产截面在大型强子对撞机和轻子对撞机。 研究项目的影响和后果： 探索多TeV暗物质质量范围的开始与目前开始或即将开始的直接搜索实验是非常令人兴奋的，使这个研究项目非常及时地提供理论方面的支持，并将实验结果与暗物质模型联系起来。我们预计，将直接搜索实验的结果与理论模型联系起来将是该项目的主要目标和影响。然而，我们也希望从暗物质的角度来解决非微扰模型的需要，作为强子物理学的补充动机，将反馈到对非微扰场论的更好的一般理解中，也将有助于提高我们对强子物理学的理解。 加拿大人对知识前沿的研究有着浓厚的兴趣，并对加拿大通过支持国家实验室的设施和实验所作出的世界级贡献感到非常自豪。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.