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arXiv 2004.04664gr-qc
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旋转时空中阴影半径与拟正规模的关系

Connection Between the Shadow Radius and Quasinormal Modes in Rotating Spacetimes

Kimet Jusufi

摘要:

基于准正规模参数与沿测地线守恒量之间的几何光学对应关系,我们提出了一个由\begin{equation}\notag \bar{R}_s=\frac{\sqrt{2}}{2}\left(\sqrt{\frac{ r_0^{+}}{f'(r)|_{r_0^{+}}}}+\sqrt{\frac{ r_0^{-}}{f'(r)|_{r_0^{-}}}}\right), \end{equation}给出的计算渐近平坦旋转黑洞在赤道平面上的典型阴影半径的方程,其中$r_0^{\pm}$是对应模的圆零测地线的半径.此外,我们已经明确相关的阴影半径的实部QNM在程函制度对应的反和逆行模式,分别。作为一个特例,我们计算了一些著名的黑洞解的典型黑洞阴影半径,包括Kerr黑洞,Kerr-Newman黑洞和由Myers-Perry黑洞描述的高维黑洞解.

英文摘要:

Based on the geometric-optics correspondence between the parameters of a quasinormal mode and the conserved quantities along geodesics, we propose an equation to calculate the typical shadow radius for asymptotically flat and rotating black holes when viewed from the equatorial plane given by \begin{equation}\notag \bar{R}_s=\frac{\sqrt{2}}{2}\left(\sqrt{\frac{ r_0^{+}}{f'(r)|_{r_0^{+}}}}+\sqrt{\frac{ r_0^{-}}{f'(r)|_{r_0^{-}}}}\right), \end{equation} with $r_0^{\pm}$ being the radius of circular null geodesics for the corresponding mode. Furthermore we have explicitly related the shadow radius to the real part of QNMs in the eikonal regime corresponding to the prograde and retrograde mode, respectively. As a particular example, we have computed the typical black hole shadow radius for some well known black hole solutions including the Kerr black hole, Kerr-Newman black hole and higher dimensional black hole solutions described by the Myers-Perry black hole.

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