Inside the extremal dyonic Kerr-Sen black hole, scalar field modes have purely imaginary frequencies, so they do not propagate; the growing modes can destroy the region containing closed timelike curves, supporting the Chronology Protection Conjecture.
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Scalar Instabilities Inside The Extremal Dyonic Kerr-Sen Black Hole: Novel Exact Solutions and Chronology Protection Conjecture
Inside the extremal dyonic Kerr-Sen black hole, scalar field modes have purely imaginary frequencies, so they do not propagate; the growing modes can destroy the region containing closed timelike curves, supporting the Chronology Protection Conjecture.