Year: 2026
Type: preprint
Abstract: We study the type I quasinormal modes (QNMs) of magnetically charged dilaton--Euler--Heisenberg (dEH) black holes, where axial gravitational and polar electromagnetic perturbations are coupled. Direct integration and Chebyshev pseudospectral methods give consistent QNM frequencies for the fundamental branches continued from Schwarzschild at $\ell=1,2,3$. Varying $α$ at fixed $ζ=α-β$ changes the spectrum on the same background. The damping response depends on charge and multipole and can have opposite signs for the two coupled branches. For $ζ<0$, dipole damping decreases with charge toward horizon merger. For $ζ>0$, the Type I charge range extends beyond the complementary polarization's local angular-gradient bound. All tracked modes remain damped in the nonextremal ranges, supporting the stability of these branches.
Source: arXiv (Cornell University)
Institutions: Jiangxi Normal University, Yangzhou University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7223343075