On Non-tachyonic ZN x ZM Orientifolds of Type 0B String Theory
Abstract
We study open descendants of four dimensional ZN x ZM orbifolds of the non-supersymmetric type 0B string theory. An exhaustive analysis shows, that using the crosscap constraint the only model for which one can project out the tachyon is the Z2 x Z2 orbifold. For this case we explicitly construct the open string amplitudes. The gauge group corresponding to the various inequivalent Klein bottle projections turns out to be either symplectic or unitary.
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