Spectral lines of extreme compact objects
Spectral lines of extreme compact objects
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DOI：
10.1103/physrevd.98.104034
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发表时间：
2018-07
影响因子：
5
通讯作者：
C. F. Macedo;Tom Stratton;S. Dolan;L. Crispino
中科院分区：
文献类型：
--
作者：
C. F. Macedo;Tom Stratton;S. Dolan;L. Crispino
我们研究了极端/奇异的紧凑对象（ECO）-黑洞的无视界替代品-通过一个简单的模型，其中耗散机制封装在一个单一的参数的标量场的吸收。被困模式，本地化之间的ECO核心和势皇在光球，产生Breit-Wigner型的吸收截面谱线。当波的频率与被捕获的模式共振时，吸收增强，导致光谱轮廓与黑洞的光谱轮廓在性质上不同。我们介绍了一个模型的基础上Nariai时空，其中的光谱线的属性计算在封闭的形式。我们提出了数值计算的吸收截面和传输因子的例子的情况下，并显示Nariai模型捕获的基本功能。我们认为，原则上，ECO可以通过它们的吸收光谱从黑洞中区分出来。
We study the absorption of scalar fields by extreme/exotic compact objects (ECOs) -- horizonless alternatives to black holes -- via a simple model in which dissipative mechanisms are encapsulated in a single parameter. Trapped modes, localized between the ECO core and the potential barrier at the photosphere, generate Breit-Wigner-type spectral lines in the absorption cross section. Absorption is enhanced whenever the wave frequency resonates with a trapped mode, leading to a spectral profile which differs qualitatively from that of a black hole. We introduce a model based on Nariai spacetime, in which properties of the spectral lines are calculated in closed form. We present numerically calculated absorption cross sections and transmission factors for example scenarios, and show how the Nariai model captures the essential features. We argue that, in principle, ECOs can be distinguished from black holes through their absorption spectra.