Supersymmetric 4D Orientifolds of Type IIA with D6-branes at Angles

TL;DR

This paper explores four-dimensional N=1 supersymmetric orientifolds of Type IIA string theory with D6-branes at angles, analyzing various orbifold models and their tadpole cancellation conditions, revealing predominantly non-chiral massless spectra.

Contribution

It provides a detailed analysis of supersymmetric orientifolds with D6-branes at angles on specific orbifolds, including solutions to tadpole conditions for multiple models.

Findings

All models examined have non-chiral massless spectra.

Solutions to tadpole cancellation conditions are found for Z_3, Z_4, Z_6, and Z_6' orbifolds.

The models maintain N=1 supersymmetry with specific orientifold projections.

Abstract

We study a certain class of four-dimensional N=1 supersymmetric orientifolds for which the world-sheet parity transformation is combined with a complex conjugation in the compact directions. We investigate in detail the orientifolds of the Z_3, Z_4, Z_6 and Z_6' toroidal orbifolds finding solutions to the tadpole cancellation conditions for all models. Generically, all the massless spectra turn out to be non-chiral.