Asymmetric orbifolds and higher level models

Jens Erler
1996 Nuclear Physics B  
I introduce a class of string constructions based on asymmetric orbifolds leading to level two models. In particular, I derive in detail various models with gauge groups $E_6$ and SO(10), including a four generation $E_6$ model with two adjoint representations. The occurrence of multiple adjoint representations is a generic feature of the construction. In the course of describing this approach, I will address the problem of twist phases in higher twisted sectors of asymmetric orbifolds.
doi:10.1016/0550-3213(96)00305-7 fatcat:at777bdtynaoxajogrxpz6y3ze