Orientifolds of Non-Supersymmetric Asymmetric Orbifolds

Details Orientifolds of Non-Supersymmetric Asymmetric Orbifolds Orientifolds of Non-Supersymmetric Asymmetric Orbifolds

1998-12-17

arxiv.org/abs/hep-th/9812158v3

Nucl.Phys. B551 (1999) 601-616

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, 3 figures, TeX; model changed from SU(2)^4 to SO(8) lattice, massless spectra changed

Scientific paper

10.1016/S0550-3213(99)00241-2

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.

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