Bonn - Seminar Room BCTP
Discrete Symmetries in Global MSSM-like D-Brane Models
Discrete symmetries are usually invoked to explain the absence of baryon- and lepton-number violating operators in the MSSM. In global D-brane models, discrete Z_n symmetries arise as remnants of massive Abelian gauge symmetries. I will discuss the conditions for the existence of Z_n symmetries in intersecting D-brane worlds on orbifold backgrounds. An examplary global model with particle physics spectrum will be presented together with its set of family-independent and family-dependent discrete Z_n symmetries.