Taub-NUT dyons in heterotic string theory.

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 non–trivial 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, IR) 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. Revised Version, 21st June 1994. ∗ e-mail: [email protected] † e-mail: [email protected]