572 citations · 3.9k across the 34 of their papers we have counts for
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Einstein-Maxwell-dilaton neutral black holes in strong magnetic fields: topological charge, shadows and lensing
Haroldo C. D. Lima Junior, Jian-Zhi Yang, Luís C. B. Crispino +2
The light rings (LRs) topological charge (TC) of a spacetime measures the number of stable LRs minus the number of unstable LRs. It is invariant under smooth spacetime deformations…
Exploring New Redshift Indicators for Radio-Powerful AGN
Rodrigo Carvajal, Israel Matute, José Afonso +4
Active Galactic Nuclei (AGN) are relevant sources of radiation that might have helped reionising the Universe during its early epochs. The super-massive black holes (SMBHs) they ho…
Shadows and lensing of black holes immersed in strong magnetic fields
Haroldo C. D. Lima Junior, Pedro V. P. Cunha, Carlos A. R. Herdeiro +1
We investigate the null geodesic flow and in particular the light rings (LRs), fundamental photon orbits (FPOs) and shadows of a black hole (BH) immersed in a strong, uniform magne…
Can different black holes cast the same shadow?
Haroldo C. D. Lima Junior, Luís C. B. Crispino, Pedro V. P. Cunha +1
We consider the following question: may two different black holes (BHs) cast exactly the same shadow? In spherical symmetry, we show the necessary and sufficient condition for a st…
The imitation game: Proca stars that can mimic the Schwarzschild shadow
Carlos A. R. Herdeiro, Alexandre M. Pombo, Eugen Radu +2
Can a dynamically robust bosonic star (BS) produce an (effective) shadow that mimics that of a black hole (BH)? The BH shadow is linked to the existence of light rings (LRs). For f…