Abstract
The conjecture that geodesics in the Kerr matric witha > m cannot violate causality in the sense of meeting a turning point before making up for lost time, is found to be untrue for null geodesics.
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de Felice, F., Calvani, M. Causality violation in the Kerr metric. Gen Relat Gravit 10, 335–342 (1979). https://doi.org/10.1007/BF00759491
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DOI: https://doi.org/10.1007/BF00759491