A covariant framework is developed for photon surfaces in dynamical spherical spacetimes, recovering static limits and applied to collapse and accretion/evaporation models.
Images and Photon Ring Signatures of Thick Disks Around Black Holes
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Brisk light bridges fast and slow prescriptions by using dominant temporal intervals per lensing band, with mismatches reaching tens of percent when source variability is shorter than delay spreads.
Kerr-BR black hole images with magnetically coupled synchrotron emissivity show spin- and B-dependent shifts in the inner disk edge, altered lensing rings, and Doppler asymmetries, with retrograde cases displaying wider central depletion.
Increasing charge Q shrinks photon rings and central shadows in Kerr-Sen black hole images while spin creates brightness asymmetry; polarization patterns follow lensing and frame dragging.
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Photon spheres in dynamical space-times
A covariant framework is developed for photon surfaces in dynamical spherical spacetimes, recovering static limits and applied to collapse and accretion/evaporation models.
- Photon Propagation and Black Hole Imaging in Kruglov Nonlinear Electrodynamics