Charged scalar fields on Kerr-EMDA black holes admit confluent Heun solutions yielding universal imaginary frequency spacing 1/(2M), entropy quanta 4π r_+/(r_+ - r_-), and the first analytical greybody factors for this geometry.
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Greybody Factor, Resonant Frequencies, and Entropy Quantization of Charged Scalar Fields in the Kerr-EMDA Black Hole
Charged scalar fields on Kerr-EMDA black holes admit confluent Heun solutions yielding universal imaginary frequency spacing 1/(2M), entropy quanta 4π r_+/(r_+ - r_-), and the first analytical greybody factors for this geometry.