From trivial to non-trivial conformal string backgrounds via O(d, d) transformations

Abstract

Recently proposed extensions of target-space duality and Narain transformations can be used to generate highly non-trivial conformal string backgrounds out of (almost) trivial ones. The example of "inverting"and "boosting"a flat, Milne-type cosmological metric is worked out in detail. Analogously, starting from Rindler's metric, one can generate a sort of 3D black hole.