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Absorption and scattering of massless scalar waves by black holes with scalar hair
Abstract
We use partial waves to study massless scalar absorption and scattering by the normal (ξ=5) and phantom (ξ=−2) Bakopoulos--Nakas black holes, described by mass M and scalar charge q. At fixed mass M=1, increasing q/M decreases the horizon area and geometric capture cross section in the normal branch, but it increases both in the phantom branch. The low-frequency absorption tends to the horizon area, while photon-sphere scaling brings the absorption spectra close together. In scattering picture, charge and branch change the interference pattern, and higher frequencies make the fringes narrow. However, matching the capture or glory scale of the normal branch with Reissner--Nordström black holes indicates finite-frequency differences.
Related
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BibTeX
@misc{zhang2026absorption,
title = {{Absorption and scattering of massless scalar waves by black holes with scalar hair}},
author = {Lina Zhang and Yun Soo Myung and Yu-Xuan Wang and Xufen Zhang and Ming Zhang and De-Cheng Zou},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.00709},
eprint = {2611.00709},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.00709},
}
RIS
TY - UNPB
TI - Absorption and scattering of massless scalar waves by black holes with scalar hair
AU - Lina Zhang
AU - Yun Soo Myung
AU - Yu-Xuan Wang
AU - Xufen Zhang
AU - Ming Zhang
AU - De-Cheng Zou
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.00709
UR - https://arxiv.org/abs/2611.00709
AB - We use partial waves to study massless scalar absorption and scattering by the normal (ξ=5) and phantom (ξ=−2) Bakopoulos--Nakas black holes, described by mass M and scalar charge q. At fixed mass M=1, increasing q/M decreases the horizon area and geometric capture cross section in the normal branch, but it increases both in the phantom branch. The low-frequency absorption tends to the horizon area, while photon-sphere scaling brings the absorption spectra close together. In scattering picture, charge and branch change the interference pattern, and higher frequencies make the fringes narrow. However, matching the capture or glory scale of the normal branch with Reissner--Nordström black holes indicates finite-frequency differences.
ER -