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For over 25 years, a solution has existed to Einstein's vacuum equation thatdescribes a space-time with two Kerr black holes. First formulated by Kramerand Neugebauer (KN) in 1980 [1], this solution has been extensively researchedby many, with many and varied implications. One of which is causalityviolation.

The Double Kerr Solution as a Possible Mechanism for Controlled Global Causality Violation