Taub-NUT dyons in heterotic string theory

Abstract

Starting with the Taub-NUT solution to Einstein’s equations, together with a constant dilaton, a dyonic Taub-NUT solution of low energy heterotic string theory with a nontrivial dilaton, axion, and U(1) gauge fields is constructed by employing O(1,1) transformations. The electromagnetic dual of this solution is constructed, using SL(2,openR) transformations. By an appropriate change to scaled variables, the extremal limit of the dual solution is shown to correspond to the low energy limit of an exact conformal field theory presented previously.