Speaker: Yongcheng Wu
After the Higgs discovery, we've put lots efforts on searching for new signal beyond Standard model. Extended scalar sector is a typical scenario in which we include more scalar multiplets in addition to the SM doublet. Within such scenario, the symmetry of the model will probably be enhanced. It is known that spontaneous broken of the symmetry might induce topological defects in the early universe. In this talk, I will focus on the Domain wall, which is induced from spontaneous broken of discrete symmetries. After a brief introduction about the topological defects, especially the domain wall and the domain wall problem, I will use two simple extended scalar models to illustrate the constraints from the domain wall on part of the parameter spaces. It turns out that these constraints might be quite complementary to other kind constraints.