Matrix Ernst Potentials and Orthogonal Symmetry for Heterotic String in Three Dimensions

A new matrix representation for low-energy limit of heterotic string theory reduced to three dimensions is considered. The pair of matrix Ernst Potentials uniquely connected with the coset matrix is derived. The action of the symmetry group on the Ernst potentials is established.Comment: 10 pages in LaTe

Charging Symmetries and Linearizing Potentials for Einstein-Maxwell Dilaton-Axion Theory

We derive a set of complex potentials which linearize the action of charging symmetries of the stationary Einstein-Maxwell dilaton-axion theory.Comment: 10 pages in LaTe