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.
Horowitz, and Andrew Strominger
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A new thermodynamic inequality 4πJ²/(3MV) < 1 is derived for rotating AdS black holes to prevent naked singularities and uphold cosmic censorship.
Lyapunov exponents of charged probes capture the same cusp and transition points in dilatonic RN-AdS phase structure across Einstein and string frames, even though the exponent values themselves depend on frame for massive particles.
GRRT simulations show that raising the dilaton parameter shrinks the bright ring while increasing its width and brightness, disk thickness reduces diameter and width with weaker brightness impact, and both affect allowed ranges versus EHT Sgr A* data and the polarization coefficient beta2.
Light deflection and photon orbits around Kerr-Sen black holes are modified by homogeneous and inhomogeneous plasma, with explicit comparisons to the vacuum case.
citing papers explorer
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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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Novel thermodynamic inequality for rotating AdS black holes
A new thermodynamic inequality 4πJ²/(3MV) < 1 is derived for rotating AdS black holes to prevent naked singularities and uphold cosmic censorship.
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Phase Transitions with Lyapunov Exponents under Einstein and String Frames in Dilatonic Reissner--Nordstr\"om--AdS Black Holes
Lyapunov exponents of charged probes capture the same cusp and transition points in dilatonic RN-AdS phase structure across Einstein and string frames, even though the exponent values themselves depend on frame for massive particles.
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Bright ring features and polarization structures in Kerr-Sen black hole images illuminated by radiatively inefficient accretion flows
GRRT simulations show that raising the dilaton parameter shrinks the bright ring while increasing its width and brightness, disk thickness reduces diameter and width with weaker brightness impact, and both affect allowed ranges versus EHT Sgr A* data and the polarization coefficient beta2.
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Gravitational lensing around a Kerr-Sen black hole in plasma background
Light deflection and photon orbits around Kerr-Sen black holes are modified by homogeneous and inhomogeneous plasma, with explicit comparisons to the vacuum case.