GSO projections in string theory are classified by fermionic SPT phases, predicting unoriented type 0 strings labeled by n mod 8 and explaining type II and type I choices.
Aspects of Type 0 String Theory
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abstract
A construction of compact tachyon-free orientifolds of the non-supersymmetric Type 0B string theory is presented. Moreover, we study effective non-supersymmetric gauge theories arising on self-dual D3-branes in Type 0B orbifolds and orientifolds.
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GSO projections via SPT phases
GSO projections in string theory are classified by fermionic SPT phases, predicting unoriented type 0 strings labeled by n mod 8 and explaining type II and type I choices.