Jin Dai1, Robert G. Leigh1, Joseph Polchinski1
1Theory Group, Department of Physics, University of Texas, Austin, TX 78712, USA
Tóm tắt
We consider the R→0 limit of toroidal compactification in various string theories. This leads to new connections between seemingly different string theories: IIA and IIB, open and closed, oriented and unoriented. We also find two new extended objects which can couple consistently to strings: the Dirichlet-brane and the orientifold plane.
