Charged scalar perturbations on Kerr-EMDA black holes admit exact confluent Heun solutions, producing universal imaginary frequency spacing of 1/(2M) and dilaton-dependent entropy quanta, with closed-form greybody factors in massless limits.
Rotating charged black hole solution in heterotic string theory.Phys
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Derives partial-wave scalar absorption in Klein-Gordon separable Johannsen spacetimes and identifies finite-frequency spectra as a probe of radial propagation sectors beyond area law and null capture.
Calculations show increasing charge Q and dilaton coupling a reduce photon sphere and shadow radii of dyon-like dilatonic black holes, enabling parameter constraints from M87* and SgrA* angular diameter observations.
Constraints on deviations from Kerr black hole metrics are derived from binary black hole inspiral waveforms modeled with effective one-body methods and analyzed via the parameterized post-Einsteinian framework.
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Greybody Factor, Resonant Frequencies, and Entropy Quantization of Charged Scalar Fields in the Kerr-EMDA Black Hole
Charged scalar perturbations on Kerr-EMDA black holes admit exact confluent Heun solutions, producing universal imaginary frequency spacing of 1/(2M) and dilaton-dependent entropy quanta, with closed-form greybody factors in massless limits.
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Scalar absorption beyond geometric optics in Klein-Gordon-separable Johannsen black hole spacetimes
Derives partial-wave scalar absorption in Klein-Gordon separable Johannsen spacetimes and identifies finite-frequency spectra as a probe of radial propagation sectors beyond area law and null capture.
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Shadow, Emission, and Strong-Field Lensing of Dilatonic Black Holes
Calculations show increasing charge Q and dilaton coupling a reduce photon sphere and shadow radii of dyon-like dilatonic black holes, enabling parameter constraints from M87* and SgrA* angular diameter observations.
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Testing black hole metrics with binary black hole inspirals
Constraints on deviations from Kerr black hole metrics are derived from binary black hole inspiral waveforms modeled with effective one-body methods and analyzed via the parameterized post-Einsteinian framework.