Speaker
Description
Regular black holes provide a compelling framework to address spacetime singularities through nonlinear electrodynamics, yielding geometries that remain well-behaved at all scales. In this work, we investigate their response to scalar field perturbations and the onset of spontaneous scalarization. Using a general inverse approach, we reconstruct the electromagnetic sector associated with a given solution and introduce a non-minimal scalar coupling. We show that this interaction can trigger a tachyonic instability, leading to scalarized black hole solutions and a non-trivial branch structure, including regions where scalarized configurations are thermodynamically preferred. We also discuss observational signatures, finding small but potentially measurable deviations in shadow size and quasi-normal mode spectra.