Magnetized (Shift-)Orientifolds

Abstract

We study four dimensional $Z_2\times Z_2$ (shift)-orientifolds in presence of internal magnetic fields and NS-NS $B$-field backgrounds, describing in some detail one explicit example with N=1 supersymmetry. These models are related by $T$-duality to orientifolds with $D$-branes intersecting at angles and exhibit, due to the background fields, a rank reduction of the gauge group and multiple matter families. Moreover, the low-energy spectra are chiral and anomaly free if $D5$-branes are present along the magnetized directions.

LaTeX file, 8 pages, based on the talk presented at the ``First International Conference On String Phenomenology'', Oxford, 6-11 july 2002. Eq.(1) and table 3 corrected. 1 reference added

References in corpus (1)

• Open strings and their symmetry groups

Cited by in corpus (1)

• Magnetic Fluxes, NS-NS $B$ Field and Shifts in Four-Dimensional Orientifolds