String Theory Dynamics In Various Dimensions
arXiv:hep-th/9503124 · doi:10.1016/0550-3213(95)00158-O
Abstract
The strong coupling dynamics of string theories in dimension $d\geq 4$ are studied. It is argued, among other things, that eleven-dimensional supergravity arises as a low energy limit of the ten-dimensional Type IIA superstring, and that a recently conjectured duality between the heterotic string and Type IIA superstrings controls the strong coupling dynamics of the heterotic string in five, six, and seven dimensions and implies $S$ duality for both heterotic and Type II strings.
54 pages, harvmac. Some references have been added and discussion of five-dimensional heterotic string expanded.