论文标题
Kerr-Newman-Kiselev-LeTelier黑洞的阴影和准模式
Shadow and quasinormal modes of the Kerr-Newman-Kiselev-Letelier black hole
论文作者
论文摘要
We investigate the null geodesics and the shadow cast by the Kerr-Newman-Kiselev-Letelier (KNKL) black hole for the equation of state parameter $ω_q=-2/3$ and for different values of the spacetime parameters, including the quintessence parameter $γ$, the cloud of string (CS) parameter $b$, the spin parameter $a$ and the charge $Q$ of the black hole.我们注意到，对于参数的不断增长的值$γ$和$ b $，KNKL黑洞的阴影大小增加，因此，黑洞的重力场的强度增加了。另一方面，随着黑洞的充电$ q $的增加，黑洞阴影的大小减少了。随着旋转参数$ a $ a knkl黑洞的值的增加，我们看到黑洞阴影的变形变得更加突出。此外，我们使用事件地平线望远镜（EHT）合作发布的数据来限制KNKL Black Black Hole的阴影，限制KNKL黑洞的参数$ b $和$γ$。为此，我们还探索了KNKL黑洞的典型阴影半径与赤道和极性准模型（QNM）之间的关系，并将此对应关系扩展到非偶然平坦的空位。我们还研究了各种时空参数的KNKL黑洞的排放能率，并观察到，对于固定电荷与质量和自旋质量比率的参数$γ$和$ b $的增加值增加。最后，我们研究了等离子体对knkl黑洞施放的阴影的光子运动，大小和形状的影响...
We investigate the null geodesics and the shadow cast by the Kerr-Newman-Kiselev-Letelier (KNKL) black hole for the equation of state parameter $ω_q=-2/3$ and for different values of the spacetime parameters, including the quintessence parameter $γ$, the cloud of string (CS) parameter $b$, the spin parameter $a$ and the charge $Q$ of the black hole. We notice that for the increasing values of the parameters $γ$ and $b$ the size of the shadow of the KNKL black hole increases and consequently the strength of the gravitational field of the black hole increases. On the other hand with increase in the charge $Q$ of the black hole the size of the shadow of the black hole decreases. Further with the increase in the values of the spin parameter $a$ of the KNKL black hole, we see that the distortion of the shadow of the black hole becomes more prominent. Moreover we use the data released by the Event Horizon Telescope (EHT) collaboration, to restrict the parameters $b$ and $γ$ for the KNKL black hole, using the shadow cast by the KNKL black hole. To this end, we also explore the relation between the typical shadow radius and the equatorial and polar quasinormal mods (QNMs) for the KNKL black hole and extend this correspondence to non-asymptotically flat spacetimes. We also study the emission energy rate from the KNKL black hole for the various spacetime parameters, and observe that it increases for the increasing values of both the parameters $γ$ and $b$ for fixed charge-to-mass and spin-to-mass ratios of the KNKL black hole. Finally, we investigate the effects of plasma on the photon motion, size and shape of the shadow cast by the KNKL black hole...
