Beyond Minimal Models in Astroparticle Physics and LHC phenomology

我将致力于新物理学的模型，当它的预测与实验数据进行比较时，解决粒子物理学标准模型的缺点。在我的博士学位的开始，我将研究模型，解决与天体粒子物理学相关的观测，特别是在我们的宇宙中观察到的暗物质或重子光子比。为了得出对更广泛的模型类有效的结论，我将研究一种最小模型方法，它包含来自模型构建的额外约束。例如，我将研究可重正化的最小模型的扩展，并模仿新物理学完整模型的现象学，以及新物理学的有效描述。这将使我能够研究天体粒子观测数据与实验室实验收集的数据之间的相关性。一个开放的研究问题是这些相关性的普遍性，上述模型设置应该允许我回答这个问题。作为一个开始的项目，我将研究与右手中微子耦合的标准模型的单态扩展。这是一个可重正化的模型，在参数空间的不同部分可以表征暗物质，通过低尺度的稀薄生成产生重子不对称性，在早期宇宙中具有一阶电弱相变，并且可以在对撞机上进行测试。我将研究其中几个是否可以在最小框架中同时实现，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%），奥利弗费舍尔（20%）和马丁Gorbahn（40%）监督，他们提供天体粒子物理学，对撞机物理学和新物理学的有效描述的专业知识。

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.