The hot early Universe must have lived through transitions around the electroweak epoch. The dynamics of this evolution is not known and is a subject of intense interest. Multi-Higgs models often possess scalar potentials which, at finite temperatures, exhibit several competing minima and lead to several phase transitions, sometimes of peculiar nature. In this talk, I will show that there exists a regime in the two-Higgs-doublet model (2HDM) in which thermal evolution of the early Universe passes through an intermediate phase of charge-breaking vacuum. This regime leads to a sequence of several phase transitions and it can also be tested at colliders. In addition, I will show that multi-Higgs-doublet models can also lead to phase transitions in which the two neutral minima are separated by a charge-breaking bubble wall, with remarkable and yet unexplored cosmological consequences.
Bio:
Igor Ivanov，中山大学物理与天文学院教授。博士期间主要研究高能电子-质子碰撞中的强子衍射问题。结合QCD和电弱物理，在2006年开始发展一种创新的几何方法来处理一般的双希格斯模型，并用它来解决传统方法很难处理的问题。获得了2009年俄罗斯联合核子中心（ JINR） 颁发的青年科学家波戈留博夫奖。与合作者一起为三希格斯模型发展了一套丰富的理论工具箱，包括代数、几何和群论方法。这些工作得到了同行的高度赞赏，有多篇相关论文引用超过100次，其中包括一篇综述文章。从2011年开始研究涡旋粒子问题，是第一批研究非零角动量粒子碰撞问题的学者之一。这方面的研究涉及粒子物理、原子物理、电动力学和光学，相关成果发表在多篇 PRL 论文和一篇合作的Phys. Rept上。
个人主页：
https://spa.sysu.edu.cn/zh-hans/teacher/114
Prof. Qinghong Cao