Non-perturbative Orientifolds

Details Non-perturbative Orientifolds Non-perturbative Orientifolds

1999-04-02

arxiv.org/abs/hep-th/9904007v4

Phys.Lett. B455 (1999) 120-128

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, revtex, a minor misprint corrected (to appear in Phys. Lett. B)

Scientific paper

10.1016/S0370-2693(99)00485-2

We consider non-perturbative six and four dimensional N=1 space-time supersymmetric orientifolds. Some states in such compactifications arise in ``twisted'' open string sectors which lack world-sheet description in terms of D-branes. Using Type I-heterotic duality we are able to obtain the massless spectra for some of such orientifolds. The four dimensional compactification we discuss in this context is an example of a chiral N=1 supersymmetric string vacuum which is non-perturbative in both orientifold and heterotic pictures. In particular, it contains both D9- and D5-branes plus non-perturbative ``twisted'' open string sector states as well.

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