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arXiv 2107.09266gr-qc
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高维Reissner-Nordström黑洞时空中无穷远处接收到的霍金辐射

Hawking radiation received at infinity in higher dimensional Reissner-Nordström black hole spacetimes

Kai Lin, Wei-Liang Qian, Xilong Fan, Bin Wang, Elcio Abdalla

摘要:

在这项工作中,我们研究的霍金辐射在高维Reissner-Nordström黑洞作为一个观察者接收,驻留在无穷远。与频率相关的传输率,变形的热辐射发射在附近的黑洞视界,数值计算。除了四维时空的情况外,计算被扩展到更高维的Reissner-Nordström度规,结果被发现对时空维度有些敏感。一般来说,可以观察到,当发射粒子的频率接近零时,透射系数几乎为零。它随着频率的增加而增加,并最终饱和到某个值。对于四维时空,一旦给出事件视界的位置$r_h$和黑洞与粒子$qQ$的电荷乘积,上述结果就基本上与度规参数无关,与粒子的轨道量子数也无关。另一方面,对于高维情况,收敛变得更慢。此外,不同轨道量子数的态之间的差异被发现更显着。随着电荷积$qQ$的大小变得更显著,透射系数超过1。换句话说,由此产生的光谱通量被放大,这导致黑洞蒸发的加速过程。讨论了计算出的出射透射系数与现有灰体因子结果之间的关系。

英文摘要:

In this work, we investigate the Hawking radiation in higher dimensional Reissner-Nordström black holes as received by an observer, resides at infinity. The frequency-dependent transmission rates, which deform the thermal radiation emitted in the vicinity of the black hole horizon, are evaluated numerically. Apart from the case of four-dimensional spacetime, the calculations are extended to higher dimensional Reissner-Nordström metrics, and the results are found to be somewhat sensitive to the spacetime dimension. In general, it is observed that the transmission coefficients practically vanishes when the frequency of the emitted particle approaches zero. It increases with increasing frequency and eventually saturates to some value. For four-dimensional spacetime, the above result is shown to be mostly independent of the metric's parameter, neither of the orbital quantum number of the particle, once the location of the event horizon, $r_h$, and the product of the charges of the black hole and the particle $qQ$ are given. For higher-dimensional cases, on the other hand, the convergence becomes more slowly. Moreover, the difference between states with different orbital quantum numbers is found to be more significant. As the magnitude of the product of charges $qQ$ becomes more significant, the transmission coefficient exceeds one. In other words, the resultant spectral flux is amplified, which results in an accelerated process of black hole evaporation. The relation between the calculated outgoing transmission coefficient with existing results on the greybody factor is discussed.

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