String Theories on the Asymmetric Orbifolds with Twist-Untwist Intertwining Currents
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We give various examples of asymmetric orbifold models to possess intertwining currents which convert untwisted string states to twisted ones, and vice versa, and see that such asymmetric orbifold models are severely restricted. The existence of the intertwining currents leads to the enhancement of symmetries in asymmetric orbifold models.
25pages
25pages