Metric for two unequal extreme Kerr-Newman black holes

In the present paper, within the framework of stationary axisymmetric spacetimes, binary systems composed of two unequal co-and counter-rotating extreme Kerr-Newman black holes separated by a massless strut are reported. The metric describing both configurations is introduced in a closed analytical form in terms of five arbitrary parameters: the masses M-i, electric charges Q(i), and a coordinate distance R. We obtain novel results from these configurations; in particular, those related to the merging process. (c) 2022 The Author(s). Published by Elsevier B.V.This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).