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Phys. Rev. D 54, 5049 - 5058 (1996)

Dilatonic black holes in higher curvature string gravity

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P. Kanti1, N. E. Mavromatos2, J. Rizos3, K. Tamvakis3 *, and E. Winstanley2
1Division of Theoretical Physics, Physics Department, University of Ioannina, Ioannina GR-451 10, Greece
2Department of Physics (Theoretical Physics), University of Oxford, 1 Keble Road, Oxford OX1 3NP, United Kingdom
3European Organization for Nuclear Research (CERN), Theory Division, 1211 Geneva 23, Switzerland

Received 10 November 1995

We give analytical arguments and demonstrate numerically the existence of black hole solutions of the 4D effective superstring action in the presence of Gauss-Bonnet quadratic curvature terms. The solutions possess nontrivial dilaton hair. The hair, however, is of "secondary type," in the sense that the dilaton charge is expressed in terms of the black hole mass. Our solutions are not covered by the assumptions of existing proofs of the "no-hair" theorem. We also find some alternative solutions with singular metric behavior, but finite energy. The absence of naked singularities in this system is pointed out.


©1996 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevD.54.5049
DOI: 10.1103/PhysRevD.54.5049
PACS: 04.70.Bw, 04.20.Jb, 04.50.+h, 11.25.Mj

* On leave of absence from Physics Department, University of Ioannina, Ioannina, Greece.

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