Space-time singularities and the axion in the Poincare coset models ISO(2,1)/H
Abstract
By promoting an invariant subgroup H of ISO(2,1) to a gauge symmetry of a WZWN action, we obtain the description of a bosonic string moving either in a curved 4-dimensional space--time with an axion field and curvature singularities or in 3-dimensional Minkowski space--time.
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