Abstract
We study open descendants of four dimensional Z N × Z M 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 Z 2× Z 2 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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