Particle models from orientifolds at Gepner-orbifold points

TL;DR

This paper constructs chiral gauge theories using orientifold planes and D-branes on Gepner-orbifold spaces, demonstrating how discrete symmetries lead to consistent projections and various supersymmetric or non-supersymmetric models.

Contribution

It introduces a method to derive chiral gauge theories from Gepner model orientifolds via discrete symmetry modding, expanding the toolkit for string model building.

Findings

Successfully achieved D-brane configuration projections leading to chiral gauge theories.

Constructed both supersymmetric and non-supersymmetric tachyon-free models.

Provided explicit examples illustrating the procedure.

Abstract

We consider configurations of stacks of orientifold planes and D-branes wrapped on a non trivial internal space of the structure {(Gepner model)^{c=3n} x T^{2(3-n)}}/Z_N, for n=1,2,3. By performing simple moddings by discrete symmetries of Gepner models at orienti fold points, consistent with a Z_N orbifold action, we show that projection on D-brane configurations can be achieved, generically leading to chiral gauge theories. Either supersymmetric or non-supersymmetric (tachyon free) models can be obtained. We illustrate the procedure through some explicit examples.