Abstract :
[en] We present new exact three-dimensional black-string backgrounds, which contain
both NS-NS and electromagnetic fields, and generalize the btz black holes and the
black string studied by Horne and Horowitz. They are obtained as deformations of the
SL(2,R) wzw model. Black holes resulting from purely continuous deformations possess
true curvature singularities. When discrete identifications are introduced, extra chronological
singularities appear, which under certain circumstances turn out to be naked. The
backgrounds at hand appear in the moduli space of the SL(2,R) wzw model. Hence, they
provide exact string backgrounds and allow for a more algebraical (cft) description. This
makes possible the determination of the spectrum of primaries.
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