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arXiv · 2611.00709

Absorption and scattering of massless scalar waves by black holes with scalar hair

Lina Zhang·Yun Soo Myung·Yu-Xuan Wang·Xufen Zhang·Ming Zhang·De-Cheng Zou
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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.

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Lina Zhang, Yun Soo Myung, Yu-Xuan Wang, Xufen Zhang, Ming Zhang, De-Cheng Zou. 2026-10-31. Absorption and scattering of massless scalar waves by black holes with scalar hair. https://arxiv.org/abs/2611.00709

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