Spacetime supersymmetry in AdS_3 backgrounds

摘要

We construct string target spacetimes with AdS_3 * X geometry, which have an N = 2 spacetime superconformal algebra. X is found to be a U(1) fibration over a manifold which is a target for an N = 2 worldsheet conformal field theory. We emphasize theories with free field realizations where in principle it is possible to compute the full one-particle string spectrum.