标题： 关于Two Higgs双线性模型中电弱相变的微扰研究的有效性 显示英文标题

标题： On the validity of perturbative studies of the electroweak phase transition in the Two Higgs Doublet model

摘要： 利用高温下的维度约化有效理论，我们对两Higgs双重模型中的电弱相变进行了非微扰研究。我们重点关注参数空间中两个在实验上允许的点，通过动力学格点模拟来确定相变的平衡性质。我们讨论了基于重整有效势的传统微扰方法的局限性——包括红外重求和处理不足以及在大标量耦合情况下需要考虑超出一环修正的问题，并证明在有效理论内可以使用微扰方法获得更高的精度。我们发现，在非常大的标量耦合存在的情况下，无法用任何方法可靠地研究强相变。 显示英文摘要

摘要： Making use of a dimensionally-reduced effective theory at high temperature, we perform a nonperturbative study of the electroweak phase transition in the Two Higgs Doublet model. We focus on two phenomenologically allowed points in the parameter space, carrying out dynamical lattice simulations to determine the equilibrium properties of the transition. We discuss the shortcomings of conventional perturbative approaches based on the resummed effective potential - regarding the insufficient handling of infrared resummation but also the need to account for corrections beyond 1-loop order in the presence of large scalar couplings - and demonstrate that greater accuracy can be achieved with perturbative methods within the effective theory. We find that in the presence of very large scalar couplings, strong phase transitions cannot be reliably studied with any of the methods.