Multi-boundary effects in Dirichlet String Theory
arXiv:hep-th/9502106 · doi:10.1016/0550-3213(95)00192-U
Abstract
String amplitudes with an arbitrary number of world-sheet boundaries on which the coordinates satisfy Dirichlet boundary conditions are analyzed in a path integral framework. Special attention is payed to the novel divergences associated with such conditions. Certain helicity amplitudes involving massless closed-string states are free of such divergences to all orders in perturbation theory and their behavior can be analysed unambiguously. The high energy fixed-angle behavior of these amplitudes is discussed in the presence of one or two boundaries and the asymptotic behavior of the amplitudes is shown to be power behaved.
38 pages,Latex,uses epsf,5 figures in uuencoded file