Conformality Emergent In String Phenomenology

TL;DR

This paper explores how orbifolded string theories without supersymmetry can produce realistic gauge theories with chiral fermions, addressing naturalness and predicting new particles testable at the LHC.

Contribution

It demonstrates that abelian orbifolds with Z_p groups can generate chiral gauge theories with natural scalar sectors, linking string phenomenology to observable particle physics.

Findings

Absence of quadratic divergences in scalar propagators at one loop.

Conditions for chiral fermions linked to bi-fundamental scalar representations.

Predictions of new gauge and matter particles for LHC experiments.

Abstract

Use of the AdS/CFT correspondence to arrive at phenomenological gauge field theories is discussed, focusing on the orbifolded case without supersymmetry. An abelian orbifold with the finite group Z_p can give rise to a G = U(N)^p gauge group with chiral fermions and complex scalars in different bi-fundamental representations of G. The naturalness issue is discussed, particularly the absence of quadratic divergences in the scalar propagator at one loop. This requires that the scalars all be in bi-fundamentals with no adjoints, coincident with the necessary and sufficient condition for presence of chiral fermions. Speculations are made concerning new gauge and matter particles expected soon to be pursued experimentally at the LHC.