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arXiv 2102.12102gr-qc
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de Rham-Gabadadze-Tolley理论中有毛黑洞对无质量标量场的吸收

Absorption of massless scalar field by furry black holes in de Rham-Gabadadze-Tolley theory

Ping Li, Yang Huang, Xin-Zhou Li

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摘要：

在de Rham-Gabadadze-Tolley（dRGT）理论下研究了两类带毛带电黑洞对无质量标量场的吸收.在高频极限$σ_{hf}$和低频极限$σ_{lf}$下计算吸收截面。我们证明了高频极限$σ_{hf}$是阴影区，低频极限$σ_{lf}$是视界区。用比值$R_{f}=\frac{σ_{hf}}{σ_{lf}}$来度量电荷对有毛黑洞吸收谱的影响。当黑洞具有除质量外的额外电荷时，吸收比$R_{f}$的区间值不同：电荷为$[1,\frac{27}{16}]$，正电荷为$[0.7675,\frac{27}{16}]$，负电荷为$[\frac{27}{16},3.1835]$.我们也使用数值方法计算有限频域中的吸收截面。给出了一系列数值结果。

英文摘要：

We study the absorption of massless scalar field by two types furry charged black holes in de Rham-Gabadadze-Tolley (dRGT) theory. The absorption cross section is calculated in high frequency limit $σ_{hf}$ and low frequency limit $σ_{lf}$. We show that the high frequency limit $σ_{hf}$ is the area of shadow and the low frequency limit $σ_{lf}$ is the area of horizon. The ratio $R_{f}=\frac{σ_{hf}}{σ_{lf}}$ is used to measure the impact of charges on the absorption spectra of furry black hole. If the black hole possess an extra charge except mass, the interval value of absorption ratio $R_{f}$ is different: $[1,\frac{27}{16}]$ for electric charge, $[0.7675,\frac{27}{16}]$ for positive charge and $[\frac{27}{16},3.1835]$ for negative charge. We also use a numerical method to compute the absorption cross section in the finite frequency domain. A series of numerical results are presented.

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