M theory on orientifolds of K3 x S1.

Abstract

We present several orientifolds of $M$ theory on ${K}_{3}\ifmmode\times\else\texttimes\fi{}{S}^{1}$ by additional projections with respect to the finite Abelian automorphism groups of ${K}_{3}$. The resulting models correspond to anomaly-free theories in six dimensions. We construct explicit examples which can be interpreted as models with eight, four, two, and one vector multiples and $N=1$ supersymmetry in six dimensions.