Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-09-02
Phys.Lett. B469 (1999) 113-122
Physics
High Energy Physics
High Energy Physics - Theory
15 pages, harvmac
Scientific paper
10.1016/S0370-2693(99)01285-X
We study open descendants of four dimensional Z_N x 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 x 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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