Two-Dimensional String-Theory Model with No Folds

We propose a string theory model which explains several features of two-dimensional Yang-Mills theory. Folds are suppressed. This in turn leads to the empty theory in flat target spaces. The Nambu-Goto action appears in the usual way. The model naturally splits into two (chiral) sectors: orientation preserving maps and orientation reversing maps. Moreover, it has a straightforward extension to three- and four-dimensional space-times