Program

P.19 -- Poster, NCTP-42

Date: Tuesday, 1 August 2017

Time: 16h00 - 17h30

The structures of multi-period electro-weak phase transition in the 3-3-1-1 model

V. Q. Phong,N. T. Tuong, N. C. Thao, H. N. Long

Institute of Physics

The electroweak phase transition (EWPT) is considered in the framework of 3-3-1-1 model for dark matter. With a structure has many vacuum expectation values (VEVs), two VEVs on TeV scale, two VEVs on 200 GeV scale so that we approximate a phase structure has three or two periods. The first picture (two periods EWPT) has a transition $SU(3) \rightarrow SU(2)$ at 6 TeV scale and another is $SU(2) \rightarrow U(1)$ transition which is the like-standard model EWPT. The second picture is a structure of three periods EWPT which has two periods as well as the first picture and another period is the symmetry breaking process of $U(1)_N$ group. We conclude that EWPTs are the first order phase transitions when new bosons are triggers and the masses of them are about some TeVs. Especially, in two pictures, the maximum strength of the $SU(2) \rightarrow U(1)$ phase transition is equal to 2.12 so this EWPT is not strong. Moreover, neutral fermions (candidates for dark matter and obey the Fermi-Dirac distribution) can be a negative trigger for EWPT but they do not make lose the first-order EWPT at TeV scale. Furthermore, in order to the strong first-order EWPT at TeV scale, the symmetry breaking processes must produce more boson than fermion or the mass of boson must be much larger than that of fermion.

Presenter: Hoàng Ngọc Long