Abstract
T-dualities of the non-supersymmetric string models, which are constructed by twisted compactifications, are investigated. We show that the T-duality groups of such models are obtained by imposing congruence conditions on O(dL,dR,Z), that is, the non-supersymmetric string models are invariant under congruence subgroups of O(dL,dR,Z). We also point out that the transitions among the non-supersymmetric models can be induced by acting O(dL,dR,Z) transformations.
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