Of CP and other Gauge Symmetries in String Theory
M. Dine, R. G. Leigh, D. A. MacIntire
Abstract
We argue that is a gauge symmetry in string theory. As a consequence, cannot be explicitly broken either perturbatively or non-pertubatively; there can be no non-perturbative -violating parameters. String theory is thus an example of a theory where all θ angles arise due to spontaneous violation, and are in principle calculable.
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