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arXiv · hep-th/9504047

The Heterotic String is a Soliton

J. A. Harvey·A. Strominger
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Abstract

It is shown that the Type IIA superstring compactified on $K3$ has a smooth string soliton with the same zero mode structure as the heterotic string compactified on a four torus, thus providing new evidence for a conjectured exact duality between the two six-dimensional string theories. The chiral worldsheet bosons arise as zero modes of Ramond-Ramond fields of the IIA string theory and live on a signature $(20,4)$ even, self-dual lattice. Stable, finite loops of soliton string provide the charged Ramond-Ramond states necessary for enhanced gauge symmetries at degeneration points of the $K3$ surface. It is also shown that Type IIB strings toroidally compactified to six dimensions have a multiplet of string solutions with Type II worldsheets.

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J. A. Harvey, A. Strominger. 1995-05-31. The Heterotic String is a Soliton. https://doi.org/10.1016/0550-3213(95)00310-o

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