Beyond Minimal Models in Astroparticle Physics and LHC phenomology

我将致力于新的物理模型，当粒子物理的标准模型的预测与实验数据进行比较时，这些模型可以解决其缺陷。在我的博士学位开始时，我将研究与天文粒子物理相关的可观测模型，特别是关于我们宇宙中观察到的暗物质或重子与光子的比率。为了得出对更广泛类别的模型有效的结论，我将致力于包含来自模型构建的附加约束的最小模型方法。例如，我将致力于可重整化的最小模型的扩展，并模仿新物理完整模型的现象学，以及新物理的有效描述。这将使我能够研究天体粒子可观测性与从实验室实验中收集的数据之间的相关性。一个悬而未决的研究问题是这些相关性的概括性，上面描述的模型设置应该允许我回答这个问题。作为一个开始项目，我将研究耦合到右手中微子的标准模型的单重态扩展。这是一个可重整化的模型，在参数空间的不同部分可以表征暗物质，通过低尺度的细微发生产生重子不对称，表征早期宇宙的一级电弱相变，并且可以在对撞机上进行测试。我将研究是否可以在最小框架中同时实现其中的几个，并产生有趣的实验信号，以及最小框架的潜在扩展。该项目将由Tommi Alanne(40%)、Oliver Fischer(20%)和Martin Gorbahn(40%)监督，他们提供天球物理、对撞机物理和新物理的有效描述方面的专业知识。

I will work on models of new physics that address shortcomings of the standard model of particle physics when its predictions are compared with experimental data. In the beginning of my PhD, I will study models that address observables related to astro-particle physics, in particular on the observed dark matter in our universe or the baryon to photon ratio. To arrive at conclusions that are valid for a wider class of models, I will work on a minimal model approach that encompasses additional constraints from model building. I.e. I will, for example, work on extensions of minimal models that are renormalisable and mimic the phenomenology of complete models of new physics and on effective descriptions of new physics. This will enable me to study correlations of astro-particle observables with data gathered from lab based experiments. An open research question is the generalisability of these correlations and the above described model setup should allow me to answer this question. As a starting project, I will be looking into singlet extension of the standard model coupled to right-handed neutrinos. This is a renormalisable model that in different parts of the parameter space can feature dark matter, produce baryon asymmetry via low scale leptogenesis, feature a first-order electroweak phase transition in the early universe, and be testable at colliders. I will study if several of these can be achieved simultaneously in the minimal framework and produce interesting experimental signals, and potential extensions of the minimal framework. The project will be supervised by Tommi Alanne (40%), Oliver Fischer (20%) and Martin Gorbahn (40%), who provide the expertise in astro-paricle physics, collider physics, and effective descriptions of new physics.