Routing protocol

Shadow (psychology)

Physics

Astronomy

General relativity

Event horizon

Psychology

Horizon

Supermassive black hole

Event (particle physics)

Quantum electrodynamics

Computer network

Theoretical physics

Computer science

Astrophysics

Black hole (networking)

Psychotherapist

Routing (electronic design automation)

Link-state routing protocol

Galaxy

Journal of Cosmology and Astroparticle Physics

Non-linear electrodynamics (NLED) theories are well-motivated extensions of QED in the strong field regime, and have long been studied in the search for regular black hole (BH) solutions. We consider two well-studied and well-motivated NLED models coupled to General Relativity: the Euler-Heisenberg model and the Bronnikov model. After carefully accounting for the effective geometry induced by the NLED corrections, we determine the shadows of BHs within these two models. We then compare these to the shadow of the supermassive BH M87* recently imaged by the Event Horizon Telescope collaboration. In doing so, we are able to extract upper limits on the black hole magnetic charge, thus providing novel constraints on fundamental physics from this new extraordinary probe.

Magnetically charged black holes from non-linear electrodynamics and the Event Horizon Telescope