
TL;DR
This paper reviews solitons in superstring theory, exploring their properties, dualities, and implications for understanding strong coupling regimes, including string/fivebrane duality and four-dimensional string dualities.
Contribution
It provides a comprehensive review of solitonic solutions in superstring theory, emphasizing dualities and their role in strong coupling physics.
Findings
Solitons are non-singular, topologically stabilized solutions in superstring theory.
String/fivebrane duality relates fundamental strings to superfivebranes at strong coupling.
Four-dimensional dualities include string/string duality and a duality of dualities involving S- and T-duality.
Abstract
We review the status of solitons in superstring theory, with a view to understanding the strong coupling regime. These {\it solitonic} solutions are non-singular field configurations which solve the empty-space low-energy field equations (generalized, whenever possible, to all orders in ), carry a non-vanishing topological "magnetic" charge and are stabilized by a topological conservation law. They are compared and contrasted with the {\it elementary} solutions which are singular solutions of the field equations with a -model source term and carry a non-vanishing Noether "electric" charge. In both cases, the solutions of most interest are those which preserve half the spacetime supersymmetries and saturate a Bogomol'nyi bound. They typically arise as the extreme mass=charge limit of more general two-parameter solutions with event horizons. We also describe the theory…
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