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Résumé |
Exact results for the BPS index are known for a class of BPS dyons in type II string theory compactified on a
six dimensional torus. In this paper we set up the problem of counting the same BPS states in a duality
frame in which the states carry only Ramond-Ramond charges. We explicitly count the number of states
carrying the lowest possible charges and find agreement with the result obtained in other duality frames.
Furthermore, we find that after factoring out the supermultiplet structure, each of these states carry zero
angular momentum. This is in agreement with the prediction obtained from a representation of these
states as supersymmetric black holes. |
