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Journal Article

#### A Near Horizon Extreme Binary Black Hole Geometry

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1804.06985.pdf

(Preprint), 526KB

Ciafre-Rodriguez2019_Article_ANearHorizonExtremeBinaryBlack(1).pdf

(Publisher version), 366KB

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##### Citation

Ciafre, J., & Rodriguez, M. J. (2019). A Near Horizon Extreme Binary Black Hole
Geometry.* The European Physical Journal C,* *79*: 754.
doi:10.1140/epjc/s10052-019-7188-3.

Cite as: https://hdl.handle.net/21.11116/0000-0001-406E-C

##### Abstract

A new solution of four-dimensional vacuum General Relativity is presented. It

describes the near horizon region of the extreme (maximally spinning) binary

black hole system with two identical extreme Kerr black holes held in

equilibrium by a massless strut. This is the first example of a

non-supersymmetric, asymptotically flat near horizon extreme binary black hole

geometry of two uncharged black holes. The black holes are co-rotating, and the

solution is uniquely specified by the mass. The binary extreme system has

finite entropy. The distance between the black holes is fixed, but there is a

zero-distance limit where the objects collapse into one. This limiting geometry

corresponds to the near horizon extreme Kerr (NHEK) black hole.

describes the near horizon region of the extreme (maximally spinning) binary

black hole system with two identical extreme Kerr black holes held in

equilibrium by a massless strut. This is the first example of a

non-supersymmetric, asymptotically flat near horizon extreme binary black hole

geometry of two uncharged black holes. The black holes are co-rotating, and the

solution is uniquely specified by the mass. The binary extreme system has

finite entropy. The distance between the black holes is fixed, but there is a

zero-distance limit where the objects collapse into one. This limiting geometry

corresponds to the near horizon extreme Kerr (NHEK) black hole.