Black Holes and Magnetic Fields
Filip Hejda, Ji\v{r}\'i Bi\v{c}\'ak
TL;DR
This paper explores the properties of extremal rotating, charged black holes in magnetic fields, focusing on their near-horizon geometries and the magnetic field expulsion (Meissner effect).
Contribution
It provides a simplified geometric analysis of extremal black holes' near-horizon regions and investigates the magnetic field expulsion phenomenon.
Findings
Near-horizon geometries of extremal black holes are characterized.
Magnetic fields are expelled from extremal black hole horizons (Meissner effect).
Simplified models help understand black hole-magnetic field interactions.
Abstract
We briefly summarise the basic properties of spacetimes representing rotating, charged black holes in strong axisymmetric magnetic fields. We concentrate on extremal cases, for which the horizon surface gravity vanishes. We investigate their properties by finding simpler spacetimes that exhibit their geometries near degenerate horizons. Employing the simpler geometries obtained by near-horizon limiting description we analyse the Meissner effect of magnetic field expulsion from extremal black holes.
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Taxonomy
TopicsBlack Holes and Theoretical Physics · Astrophysical Phenomena and Observations · Cosmology and Gravitation Theories