Real time dynamics of the electroweak phase transition

最近在大型强子对撞机上发现的希格斯玻色子使早期宇宙中发生的电弱对称性破缺问题更加紧迫。虽然在标准模型中，这种对称性破缺是一个平滑的交叉，但在SM的许多扩展中，这个过程通过一阶相变发生。在后一种情况下，包含当前宇宙相的气泡成核并膨胀，最终充满整个宇宙。在这个项目中，学生将研究这种转变的可能残余，例如引力波或宇宙物质-反物质不对称。这将需要详细研究气泡的特性，例如它们的传播速度和释放的潜热。结果将与现有的计算接口，例如。由此产生的引力波频谱，以获得未来观测的预测。我们将研究的模型包括扩展标准模型希格斯部门与额外的希格斯二重态和单线态和模型，其中电弱对称性破缺是由强动力学驱动的TeV尺度。

The recent discovery of the Higgs boson at LHC has added urgency to the question of electroweak symmetry breaking happened in the early universe. While in the standard model this symmetry breaking is a smooth crossover, in many extension of the SM this process happens via a first-order phase transition. In the latter case, bubble containing the current phase of the universe nucleate and expand, finally filling the entire universe. In the project the student will study possible remnants of this transitions, such as gravitational waves or the cosmic matter-antimatter asymmetry. This will require to investigate in detail the properties of the bubbles, such as their propagation speed and the released latent heat. Results will be interfaced with existing computations for eg. the resulting gravitational wave spectrum to derive predictions for future observations. The models we will study include extension of the standard model Higgs sector with additional Higgs doublets and singlet and models where electroweak symmetry breaking is driven by strong dynamics at the TeV-scale.