This paper explores the near-extremal and extremal magnetized Kerr black hole, revealing the Schwinger effect in the absorption cross section at the spacetime's extremal limit. The agreement with CFT2 hints at hidden conformal symmetry. The analysis uncovers SL(2,R)L×SL(2,R)R symmetry for the massless scalar near the black hole, suggesting the Kerr/CFT correspondence for the magnetized Kerr black holes. Cardy formula of the conformal field theory is used to reproduce the black hole entropy in both extremal and near-extremal cases.
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Haryanto M. Siahaan (2024) studied this question.
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