Reissner-Nordström Type Black Holes in Dilaton-Axion Gravity

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A 2p + 5 parametric family of black holes is constructed in dilaton--axion gravity with p vector fields using a holomorphic representation of U--duality in three dimensions. The metric of the non--extremal black holes has a Reissner--Nordström type structure and generically possesses an internal horizon. However in the extremal limit the generic solution exhibits a dilatonic type null singularity. Only in the case of the orthogonal electric and magnetic charges (if p>1) the extremal solution may have a non--singular event horizon.