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We give a unified description of all BPS states of M-theory compactified on T 5 in terms of the five-brane. We compute the mass spectrum and degeneracies and find that the SO(5,5,Z)U -duality symmetry naturally arises as a T-duality by assuming that the world-volume theory of the five-brane itself is described by a string theory. We also consider the compactification onS 1 Z ...
We propose a formulation of 11-dimensional M-theory in terms of five-branes with closed strings on their world-volume. We use this description to construct the complete spectrum of BPS states in compactifications to six and five dimensions. We compute the degeneracy for fixed charge and find it to be in accordance with U-duality (which in our formulation is manifest in six dimensions) and the statistical...
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