From Superstrings to M Theory
arXiv:hep-th/9807135 · doi:10.1016/S0370-1573(99)00016-2
Abstract
In the strong coupling limit type IIA superstring theory develops an eleventh dimension that is not apparent in perturbation theory. This suggests the existence of a consistent 11d quantum theory, called M theory, which is approximated by 11d supergravity at low energies. In this review we describe some of the evidence for this picture and some of its implications.
21 pages, latex2e; to be published in a special issue of Physics Reports in memory of Richard Slansky. v2 and v3: added references and minor corrections