Effects of Born-Infeld electrodynamics on black hole shadows

Understand

In this work, we study the shadow of Born-Infeld (BI) black holes with magnetic monopoles and Schwarzschild black holes immersed in the BI uniform magnetic field.

• Illuminated by a celestial sphere, black hole images are obtained by using the backward ray-tracing method.
• For magnetically charged BI black holes, we find that the shadow radius increases with the increase of nonlinear electromagnetics effects.
• For Schwarzschild black holes immersed in the BI uniform magnetic field, photons tend to move towards the axis of symmetric, resulting in stretched shadows along the equatorial plane.