String duality and massless string states
Abstract
We are discussing the S \& T duality for special class of heterotic string configurations. This class of solutions includes various types of black hole solutions and Taub-NUT geometries. It allows a self-dual point for both dualities which corresponds to massless configurations. As string state this point corresponds to NR=1/2 and NL=0. The string/string duality is shortly discussed.
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