Fermionic zeromodes in heterotic fivebrane backgrounds

We investigate the explicit forms of the fermionic zeromodes in heterotic fivebrane back-grounds. By explicitly solving the fermionic field equations in the fivebrane backgrounds, two normalizable and physical fermionic zeromodes are obtained. Each of these zeromodes has a non-vanishing gravitino component. We propose a possible scenario for gravitino pair condensation. (author)