Comment on "Generalized near horizon extreme binary black hole geometry"
Anton Galajinsky
TL;DR
This paper shows that the near-horizon geometry of two extremal Kerr black holes held apart by a strut is a specific case of the Kerr-Bolt class, linking recent black hole solutions to known geometric structures.
Contribution
It identifies the near-horizon geometry of a binary extremal Kerr black hole system as a special case within the Kerr-Bolt class, clarifying its geometric nature.
Findings
Near-horizon geometry is a Kerr-Bolt type.
Binary extremal Kerr black holes relate to known geometric classes.
The geometry is characterized as a particular Kerr-Bolt member.
Abstract
It is demonstrated that the near-horizon geometry of two extreme Kerr black holes of equal mass, which are held a finite distance apart by a massless strut, introduced recently in [Phys. Rev. D 100 (2019) 044033], is a particular member of the near horizon Kerr-Bolt class.
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