A U(3)_C X U(3)_L X U(3)_R gauge symmetry from intersecting D-branes
G.K. Leontaris
TL;DR
This paper constructs a non-supersymmetric three-family model with U(3)^3 gauge symmetry from intersecting D-branes, extending trinification with additional U(1) factors that influence fermion hierarchies.
Contribution
It presents a novel intersecting D-brane setup realizing a trinification-like gauge symmetry with global U(1) symmetries affecting low-energy phenomenology.
Findings
Realizes Standard Model fermions in bifundamental multiplets
Achieves a natural Quark-Lepton hierarchy
Extends trinification with additional U(1) symmetries
Abstract
A three-family non-supersymmetric model with U(3)^3 gauge symmetry is analyzed in the context of intersecting D-branes. This is equivalent to the `trinification' model extended by three U(1) factors which survive as global symmetries in the low energy effective model. The Standard Model fermions are accommodated in the three possible bifundamental multiplets represented by strings with endpoints attached on different brane-stacks of this particular setup. Further, a natural Quark-Lepton hierarchy is realized due to the existence of the additional abelian symmetries
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