Non‐supersymmetric orientifolds with D‐branes at angles

We present special classes of orientifold models involving supersymmetry breaking via branes at angles. Type II superstring theories are compacti.ed on a two torus times a four‐dimensional orbifold. Combining worldsheet parity with a re.ection of half of the compact coordinates leads to D6‐branes at angles which are mapped onto each other by the orbifold group, while applying the geometric action only along one coordinate leads to intersecting D8‐branes with non‐trivial transformation properties under the orbifold group. The models differ in the gauge groups and matter content.