D=6, N=1 String Vacua and Duality
Abstract
We review the structure D=6, N=1 string vacua with emphasis on the different connections due to T-dualities and S-dualities. The topics discussed include: Anomaly cancellation; K3 and orbifold D=6, N=1 heterotic compactifications; T-dualities between E8× E8 and Spin(32)/Z2 heterotic vacua; non-perturbative heterotic vacua and small instantons; N=2 Type-II/Heterotic duality in D=4 ; F-theory/heterotic duality in D=6; and heterotic/heterotic duality in six and four dimensions.
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