Quasinormal frequencies and greybody factors for axial perturbations of dilaton-Euler-Heisenberg de Sitter black holes
Abstract
We investigate the quasinormal modes (QNMs) and greybody factors of dilaton-Euler-Heisenberg (dEH) de Sitter (dS) black holes in string-inspired Euler-Heisenberg gravity. Since the axial gravitational and electromagnetic perturbations decouple, we treat them independently. By applying the asymptotic iteration method (AIM) alongside a sixth-order WKB approximation, we compute the quasinormal frequencies and find excellent agreement between the two approaches. We also find that the QNM spectra depend sensitively on the magnetic charge Qm, cosmological constant Λ, and nonlinear coupling ε, with a notable topological anomaly appearing in the electromagnetic frequency trajectories. Additionally, larger values of Qm or the multipole number l generally suppress wave transmission, while the electromagnetic sector with ε=1 exhibits an anomalous response.
Versions
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BibTeX
@misc{zhang2026quasinormal,
title = {{Quasinormal frequencies and greybody factors for axial perturbations of dilaton-Euler-Heisenberg de Sitter black holes}},
author = {Ming Zhang and Guo-Xin Chen and Xufen Zhang and Cheng-Fu Feng and Sheng-Yuan Li and Rui-Hong Yue and De-Cheng Zou},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.15111},
eprint = {2608.15111},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.15111},
}
RIS
TY - UNPB
TI - Quasinormal frequencies and greybody factors for axial perturbations of dilaton-Euler-Heisenberg de Sitter black holes
AU - Ming Zhang
AU - Guo-Xin Chen
AU - Xufen Zhang
AU - Cheng-Fu Feng
AU - Sheng-Yuan Li
AU - Rui-Hong Yue
AU - De-Cheng Zou
PY - 2026
DA - 2026/08/15
PB - arXiv
DO - 10.48550/arxiv.2608.15111
UR - https://arxiv.org/abs/2608.15111
AB - We investigate the quasinormal modes (QNMs) and greybody factors of dilaton-Euler-Heisenberg (dEH) de Sitter (dS) black holes in string-inspired Euler-Heisenberg gravity. Since the axial gravitational and electromagnetic perturbations decouple, we treat them independently. By applying the asymptotic iteration method (AIM) alongside a sixth-order WKB approximation, we compute the quasinormal frequencies and find excellent agreement between the two approaches. We also find that the QNM spectra depend sensitively on the magnetic charge Q_m, cosmological constant Λ, and nonlinear coupling ε, with a notable topological anomaly appearing in the electromagnetic frequency trajectories. Additionally, larger values of Q_m or the multipole number l generally suppress wave transmission, while the electromagnetic sector with ε=1 exhibits an anomalous response.
ER -