Revisiting superradiant stability of Kerr-Newman black holes under a charged massive scalar
arXiv:2201.06706 · doi:10.1140/epjc/s10052-022-10476-w
Abstract
We revisit the superradiant stability of Kerr-Newman black holes under a charged massive scalar perturbation. We obtain a newly suitable potential which is not singular at the outer horizon when a radial equation is expressed the Schrödinger-type equation in terms of the tortoise coordinate. From the potential analysis, we find a condition for the superradiant stability of Kerr-Newman black holes.
arXiv comment20 pages, 12 figures, version to appear in EPJC
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