Strings from Membranes and Fivebranes

Abstract

Under the six-dimensional heterotic/type $IIA$ duality map, a solitonic membrane solution of heterotic string theory transforms into a singular solution of type $IIA$ theory, and should therefore be interpreted as a fundamental membrane in the latter theory. This finding pointed to a gap in the formulation of string theory that was subsequently filled by the discovery of the role of $D$-branes as the carriers of Ramond-Ramond charge in type $II$ string theory. The roles of compactified eleven-dimensional membranes and fivebranes in five-dimensional string theory are also discussed.

12 pages, harvmac

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