MODIFIED BLACK-HOLES IN 2-DIMENSIONAL GRAVITY

The SL(2, R)/U(1) gauged WZWN model is modified by a topological term and the accompanying change in the geometry of the two dimensional target space is determined. The possibility of this additional term arises from a symmetry in the general formalism of gauging an isometry subgroup of a non-linear sigma model with an antisymmetric tensor. It is shown, in particular, that the space-time exhibits some general singularities for which the recently found black hole is just a special case. From a conformal field theory point of view and for special values of the unitary representations of SL(2, R), this topological term can be interpreted as a small perturbation by a (1, 1) conformal operator of the gauged WZWN action.