General class of BPS saturated dyonic black holes as exact superstring solutions
Oct, 199511 pages
Published in:
- Phys.Lett.B 366 (1996) 95-103
e-Print:
- hep-th/9510097 [hep-th]
Report number:
- IASSNS-HEP-95-79,
- IMPERIAL-TP-95-96-4
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Abstract:
We show that a general class of four-dimensional, spherically-symmetric, static, dyonic BPS saturated solutions of leading-order effective equations of toroidally compactified heterotic or type II superstring theory are exact string solutions. The corresponding ten-dimensional background defines a conformal sigma-model which is a particular case of a `chiral null model' with curved `transverse' part. The exact conformal invariance is a consequence of the chiral null structure of the `electric' part of the model and the N=4 world-sheet supersymmetry of its transverse `magnetic' part. The sigma-model action has a remarkable covariance under both target space and the electromagnetic duality transformations. In general, there exists a large class of exact six-dimensional superstring solutions described by chiral null models with four-dimensional transverse parts represented by N=4 supersymmetric sigma-models with metrics conformal to hyper-Kahler ones.Note:
- 12 pages, latex Report-no: IASSNS-HEP-95/79, Imperial/TP/95-96/4
- string model
- supersymmetry
- effective action
- field equations: solution
- field equations: dyon
- black hole
- sigma model: nonlinear
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