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The near-horizon geometry of dilaton-axion black holes

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arxiv gr-qc/0101040 v1 pith:EMVWVUPI submitted 2001-01-10 gr-qc hep-th

G. Clement , D. Gal'tsov This is my paper · ORCID
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keywords blackgeometryholesnear-horizonextremelimitdilaton-axiongravity
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Static black holes of dilaton-axion gravity become singular in the extreme limit, which prevents a direct determination of their near-horizon geometry. This is addressed by first taking the near-horizon limit of extreme rotating NUT-less black holes, and then going to the static limit. The resulting four-dimensional geometry may be lifted to a Bertotti-Robinson-like solution of six-dimensional vacuum gravity, which also gives the near-horizon geometry of extreme Kaluza-Klein black holes in five dimensions.

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  1. Optical Characteristics of the Kerr-Bertotti-Robinson Black Hole

    gr-qc 2025-08 conditional novelty 6.0 of 10

    For the Kerr-Bertotti-Robinson black hole, the magnetic field mainly enlarges the shadow and Einstein ring while rotation mainly distorts the shadow shape, and current M87* and Sgr A* data give only weak bounds on the field.

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