%0 Journal Article
%T Orientifolds of Non-Supersymmetric Asymmetric Orbifolds
%A Ralph Blumenhagen
%A Lars Goerlich
%J Physics
%D 1998
%I arXiv
%R 10.1016/S0550-3213(99)00241-2
%X We consider certain four dimensional supersymmetric and non-supersymmetric asymmetric orbifolds with vanishing cosmological constant up to two loops and gauge the world sheet parity transformation. This leads to new string vacua, in which Dp and D(p-4) branes or Dp and anti-D(p-4) are identified. Moreover, it is shown that different degrees of supersymmetry can be realized in the bulk and on the brane. We show that for non-supersymmetric models the cosmological constant still vanishes at one loop order.
%U http://arxiv.org/abs/hep-th/9812158v3