TL;DR
This paper reviews orientifold models with magnetic backgrounds, highlighting how rotated D-branes and O-planes provide a geometric understanding, and discusses supersymmetry restoration with multiple magnetic fields.
Contribution
It introduces a geometric framework for orientifold constructions with magnetic backgrounds, including the effects of multiple magnetic fields on supersymmetry.
Findings
Orientifold models can be described using rotated D-branes and O-planes.
Supersymmetry can be partially restored with multiple magnetic backgrounds.
Magnetic fields influence the transmutation of D-branes and O-planes.
Abstract
We review orientifold constructions in the presence of magnetic backgrounds both in the open and closed sectors. Generically, the resulting orientifold models have a nice geometric description in terms of rotated D-branes and/or O-planes. In the case of multiple magnetic backgrounds, some amount of supersymmetry is recovered if the magnetic fields are suitably chosen and part of the original D-branes and/or O-planes are transmuted into new ones.
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