# On Non-tachyonic Z\_N x Z\_M Orientifolds of Type 0B String Theory

Source: [On Non-tachyonic Z\_N x Z\_M Orientifolds of Type 0B String Theory](<https://www.sota2.com/research/paper/68fa24d82c2a3760193a9a5f>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T09:35:15.568Z

Authors: K. Foerger

Published: 1999-09-02T16:05:31.000Z

## Abstract

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.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-th/9909010>)

[PDF](<https://arxiv.org/pdf/hep-th/9909010.pdf>)