Couplings and scales in superstring models
- 22 July 1985
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 55 (4), 366-369
- https://doi.org/10.1103/physrevlett.55.366
Abstract
The domains of weak coupling of superstring theories are identified. Compactifications on Calabi-Yau spaces encounter a problem related to vacuum stability. Although the string theory may be weakly coupled and a semiclassical approximation may be valid, both theoretical and phenomenological arguments indicate that the nonlinear σ model on the string world sheet must be strongly coupled.Keywords
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