CP and other gauge symmetries in string theory.

@article{Dine1992CPAO,
  title={CP and other gauge symmetries in string theory.},
  author={Dine and Leigh and MacIntire},
  journal={Physical review letters},
  year={1992},
  volume={69 14},
  pages={
          2030-2032
        }
}
We argue that {ital CP} is a gauge symmetry in string theory. As a consequence, {ital CP} cannot be explicitly broken either perturbatively or nonperturbatively; there can be no nonperturbative {ital CP}-violating parameters. String theory is thus an example of a theory where all {theta} angles arise due to spontaneous {ital CP} violation, and are in principle calculable. 
Towards a Realistic Picture of CP Violation in Heterotic String Models
We find that dilaton dominated supersymmetry breaking and spontaneous CP violation can be achieved in heterotic string models with superpotentials singular at the fixed points of the modular group. A
CP violation in modular invariant flavor models
We study the spontaneous CP violation through the stabilization of the modulus τ in modular invariant flavor models. The CP-invariant potential has the minimum only at Re[τ]=0 or 1/2(mod 1). From
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