Non-Supersymmetric Type I Strings with Zero Vacuum Energy
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We study open descendants of non-supersymmetric type IIB asymmetric (freely acting) orbifolds with zero cosmological constant. A generic feature of these models is that supersymmetry remains unbroken on the brane at all mass levels, while it is broken in the bulk in a way that preserves Fermi-Bose degeneracy in both the massless and massive (closed string) spectrum. This property remains valid in the heterotic dual of the type II model but only for the massless excitations. A possible application of these constructions concerns scenarios of low-energy supersymmetry breaking with large dimensions.
22 pages, TeX, harvmac. Minor corrections. Final version to appear on Nucl.Phys.B
22 pages, TeX, harvmac. Minor corrections. Final version to appear on Nucl.Phys.B