Generalized near horizon extreme binary black hole geometry

Jacob Ciafre, Shahar Hadar, Erin Rickenbach, Maria J. Rodriguez

Research output: Contribution to journalArticlepeer-review


We present a new vacuum solution of Einstein's equations describing the near horizon region of two neutral, extreme (zero-temperature), corotating, nonidentical Kerr black holes. The metric is stationary, asymptotically near horizon extremal Kerr (NHEK), and contains a localized massless strut along the symmetry axis between the black holes. In the deep infrared, it flows to two separate throats which we call "pierced-NHEK" geometries: each throat is NHEK pierced by a conical singularity. We find that in spite of the presence of the strut for the pierced-NHEK geometries the isometry group SL(2,R)×U(1) is restored. We find the physical parameters and entropy.

Original languageEnglish
Article number044033
JournalPhysical Review D
Issue number4
StatePublished - 15 Aug 2019
Externally publishedYes

Bibliographical note

Funding Information:
We would like to thank David Chow and Oscar Varela for helpful discussions. This work was supported by the NSF Grant No. PHY-1707571 at Utah State University and, partially, by the Max Planck Gesellschaft through the Gravitation and Black Hole Theory Independent Research Group. S. H. gratefully acknowledges support by the Jacob Goldfield Postdoctoral Support Fund.

Publisher Copyright:
© 2019 authors. Published by the American Physical Society.

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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