| Speaker: | Antonio de Felice (YITP, Kyoto Univ.) |
|---|---|
| Title: | Instability of regular BH solutions in NED |
| Date (JST): | Thu, Feb 13, 2025, 13:30 - 15:00 |
| Place: | Conference Room A |
| Abstract: | I will show that nonsingular black holes realized in nonlinear electrodynamics are always prone to Laplacian instability around the center because of a negative squared sound speed in the angular direction. This is the case for both electric and magnetic BHs, where the instability of one of the vector-field perturbations leads to enhancing a dynamical gravitational perturbation in the even-parity sector. Thus, the background regular metric is no longer maintained in a steady state. Our results suggest that the construction of stable, nonsingular black holes with regular centers, if they exist, requires theories beyond nonlinear electrodynamics. |
