Electromagnetic perturbations in Schwarzschild spacetime reduce to a Helmholtz equation with a derived position- and frequency-dependent refractive index encoding gravitational redshift, curvature, and angular momentum.
Mashhoon, Scattering of electromagnetic radia- tion from a black hole, Phys
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An RG-improved Schwarzschild metric with de Sitter core is studied for shadow radius, scalar/EM/Dirac quasinormal modes via WKB and time-domain methods, SCC compliance at the inner horizon, and a Davies-type thermodynamic phase transition.
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Electromagnetic wave propagation in static black hole spacetimes: an effective refractive index description in Schwarzschild geometry
Electromagnetic perturbations in Schwarzschild spacetime reduce to a Helmholtz equation with a derived position- and frequency-dependent refractive index encoding gravitational redshift, curvature, and angular momentum.
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Renormalization-group improved Schwarzschild black hole: shadow, ringdown, and strong cosmic censorship
An RG-improved Schwarzschild metric with de Sitter core is studied for shadow radius, scalar/EM/Dirac quasinormal modes via WKB and time-domain methods, SCC compliance at the inner horizon, and a Davies-type thermodynamic phase transition.