New light physics beyond the Standard Model

超越标准模型的新光物理

• 批准号: 2889508
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2889508
• 关键词: New; light; physics; beyond; Standard

The project will involve studying the properties of possible new light particles beyond the Standard Model of particle physics and their astrophysical and cosmological signatures and constraints, with the aim to make predictions relevant to high energy theories, such as string theory, as well as upcoming experimental searches. The initial aim will be to reliably calculate the constraints on Kaluza Klein gravitons coming from the observation of a neutrino burst from supernoava 1987a, correcting previous calculations by taking into account plasma mixing effects (which might change the resulting limits on the coupling constants of such gravitons to visible sector matter by orders of magnitude). Such particles have been (controversially) predicted by string theory models as an inevitable consequence of the cosmological constant, and a strengthened constraint could rule out this scenario or open an avenue to a discovery. Plasma mixing effects have previously been considered for scalars (spin 0) and vectors (spin 1) but this would be the first ever computation for a spin 2 particle. The methodology will involve using techniques from finite temperature field theory to account for the in-medium effects on the production rate, and in particular the possibility of resonant production building on the previous work for the lower spin case. Depending on the results, it might also be interesting to investigate the impact of such finite temperature effects on the cosmological history of Kaluza Klein gravitons; since the Universe was extremely hot at early times such effects could again lead to dramatic changes compared to the previous prediction. This will enable a precise prediction of the Dark Matter relic abundance of such particles (which has previously been only estimated) and it might lead to predictions that can be feed into an experimental search programme. Subsequently, the scope will be widened to consider the constraints on other classes of new particles including axions, which are especially well motivated, as well as possible new light scalars that might play a role in sourcing Dark Energy. Again in this case, finite temperature and density effects have not been consistently accounted for. The overall impact of the project will be 1. On the immediate field of researchers in physics beyond the Standard Model and astroparticle physics. 2. On the field of string theory phenomenology, (part of which) has predicted such new light particles exist. 3. The experimental programme searching for new light particles in the UK and world-wide, by providing predictions and targets and complementary constraints.

该项目将涉及研究粒子物理学的标准模型及其天体物理和宇宙学特征和约束的标准模型之外可能的新光颗粒的性质，以便对高能源理论（例如弦乐理论）以及即将进行的实验搜索进行预测。最初的目的是可靠地计算出来自SuperNoava 1987a中中微子爆发的Kaluza klein Gravitons的限制，从而考虑了等离子体混合效应来纠正先前的计算（这可能会通过订单命令的可见扇区对此类坟墓的耦合构成的构造构成的限制）。弦理论模型（有争议）预测了这种粒子是宇宙常数的必然结果，而加强的约束可以排除这种情况或为发现的途径开辟途径。先前考虑了标量（旋转0）和向量（旋转1）的血浆混合效应，但这将是Spin 2粒子有史以来的第一个计算。该方法将涉及使用有限温度场理论中的技术来解释中等内部对生产率的影响，尤其是在下旋转案例上对先前工作的谐振生产构建的可能性。根据结果​​的不同，研究这种有限温度对Kaluza Klein Gravitons宇宙学历史的影响可能也很有趣。由于宇宙在早期非常热，因此与先前的预测相比，这种影响可能再次导致巨大的变化。这将实现对此类粒子的暗物质遗物丰度的精确预测（以前仅估计），并且可能导致预测可以归入实验搜索程序中。随后，将扩大范围，以考虑对其他类别的新颗粒（包括轴）的约束，这些轴是特别有动机的轴，以及可能在采购深色能量中发挥作用的新光标量。同样，在这种情况下，有限温度和密度效应尚未始终如一地考虑。该项目的总体影响为1。除了标准模型和Astroparpicle物理学之外，物理研究人员的直接领域。 2。在弦理论现象学领域（其中一部分）预测了这种新的光颗粒。 3。通过提供预测，目标和互补约束，在英国和全球范围内寻找新的光颗粒的实验计划。