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# Title: Strong/Weak Coupling Duality from the Dual String

Authors: M. J. Duff
Abstract: On compactification to six spacetime dimensions, the fundamental heterotic string admits as a soliton a dual string whose effective worldsheet action couples to the background fields of the dual formulation of six-dimensional supergravity. On further toroidal compactification to four spacetime dimensions, the dual string acquires an $O(2,2;Z)$ target-space duality. This contains as a subgroup the axion-dilaton $SL(2,Z)$ which corresponds to a strong/weak coupling duality for the fundamental string. The dual string also provides a new non-perturbative mechanism for enhancement of the gauge symmetry.
 Comments: 23 pages LATEX Subjects: High Energy Physics - Theory (hep-th) Journal reference: Nucl.Phys.B442:47-63,1995 DOI: 10.1016/S0550-3213(95)00070-4 Report number: NI-94-033 Cite as: arXiv:hep-th/9501030 (or arXiv:hep-th/9501030v2 for this version)

## Submission history

From: [view email]
[v1] Tue, 10 Jan 1995 20:04:56 GMT (0kb,I)
[v2] Tue, 21 Feb 1995 22:15:34 GMT (15kb)