On the strongly coupled heterotic string

Abstract

We analyze in detail the anomaly cancellation conditions for the strongly coupled $E_8\times E_8$ heterotic string introduced by Horava and Witten and find new features compared to the ten-dimensional Green-Schwarz mechanism. We project onto ten dimensions the corresponding Lagrangian of the zero-mode fields. We find that it has a simple interpretation provided by the conjectured heterotic string/fivebrane duality. The part which originates from eleven-dimensions is naturally described in fivebrane language. We discuss physical couplings and scales in four dimensions.

Latex, 14 pages, Misprints corrected

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• The Ten-dimensional Effective Action of Strongly Coupled Heterotic String Theory
• Four-Dimensional Effective Supergravity and Soft Terms in M-Theory
• Compactifications of M-theory and their Phenomenological Consequences
• Supersymmetry breaking in M-theory and quantization rules
• M-Theory on S^1/Z_2 : New Facts from a Careful Analysis
• Coupling Constants and Brane Tensions from Anomaly Cancellation in M-theory
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