Seminar of the department “Theory of Fundamental Interactions”

Date and Time: Thursday, 5 October 2023, at 4:00 PM

Venue: Blokhintsev Hall (4th floor), Bogoliubov Laboratory of Theoretical Physics; online seminar on Zoom

Seminar topic: “Peccei-Quinn mechanism and axion interactions in the 3-3-1 model with Cosmological Inflation”

Speaker: Hoang Ngoc Long (Van Lang University, Vietnam)

Abstract:

Based on the Peccei-Quinn (PQ) assignment, the PQ charge operator in the 3-3-1 model with Cosmological Inflation is constructed in terms of diagonal operators T₃ and T₈ of the SU(3)_L subgroup. The formula shows that difference of PQ charges of up and down quarks is 2, i.e., ΔQ_A = 2, while for electric charge, as usually ΔQ = 1. For right handed fermions, electric charges (Q) of left-handed and right-handed are assumed to be equal, while for (Q_A) is opposite. PQ charge of neutral scalars equal ±2, while for charged scalars, it vanishes. The couplings of axion with fermions are presented. To have correct kinetic term for the axion, the PQ scale f_pq is to be VEV of the singlet scalar boson, namely, f_pq = v_ϕ. The point is worth emphasized that the axion has doubly derivative coupling with scalar playing the role of inflaton. The new effects mainly happen in the energy region from 10⁷GeV to 10¹¹GeV. The chiral effective Lagrangian as usually provides axion mass consistent with model independent prediction.