TY: JOUR
T1 - Electrically charged regular black holes in nonlinear electrodynamics: light rings, shadows, and gravitational lensing
A1 - de Paula, Marco A.?A.
A1 - Junior, Haroldo C.?D. Lima
A1 - Cunha, Pedro V. P.
A1 - Crispino, Luís C.?B.
N2 - Within nonlinear electrodynamics (NED), photons follow null geodesics of an effective geometry, which
is different from the geometry of the spacetime itself. Over the last years, several works were dedicated to
investigate the motion of photons in the effective geometry of NED-based magnetically charged regular black
hole (RBH) solutions. However, there are few works considering electrically charged RBHs. We study the light
rings, shadows, and gravitational lensing of the electrically charged RBH solution proposed by Irina Dymnikova
(ID), which is a static and spherically symmetric spacetime with a NED source. We show that the shadow
associated to the effective geometry can be almost 10% bigger that the one associated to the standard geometry.
We also find that the ID solution may mimic the shadow properties of the Reissner-Nordstrom (RN) BH, for low- ¨
to-extreme values of the electric charge. Besides that, by using the backwards ray-tracing technique, we obtain
that ID and RN BH solutions can have a very similar gravitational lensing, for some values of the correspondent
electric charges. We also show that the motion of photons in the effective geometry can be interpreted as a
non-geodesic curve submitted to a 4-force term, from the perspective of an observer in the standard geometry.
UR - https://ria.ua.pt/handle/10773/39846
Y1 - 2023
PB - American Physical Society