A HETEROTIC MULTIMONOPOLE SOLUTION

An exact multi-monopole solution of heterotic string theory is presented. The solution is constructed by a modification of the 't Hooft ansatz for a four-dimensional instanton. An analogous solution in Yang-Mills field theory saturates a Bogomoln'yi bound and possesses the topology and far-fie[d limit of a multi-monopole configuration, but has divergent action near each source. In the string solution, however. the divergences from the Yang-Mills sector are precisely cancelled by those from the gravity sector. The resultant action is finite and easily computed. The Manton metric on moduli space for the scattering of two string monopoles is found to be flat to leading order ill the impact parameter, in agreement with the trivial scattering predicted by a test monopole calculation.