论文标题
带有标量头发的带电黑洞的阴影
Shadow of a charged black hole with scalar hair
论文作者
论文摘要
寻求奇异性解决方案对于进一步了解量子水平的黑洞很重要。最近，构建了五维奇异性的无黑洞/拓扑星[Phys。莱特牧师。 126，151101（2021）]。通过kaluza-klein还原，可以获得有效的四维静态球形对称的黑洞，并获得带标量的头发的黑洞。在本文中，我们根据四种观察者，即静态观察者，周围的观察者，自由落下的观察者以及在四维时空中的观察者来研究这个带有标量头发的带标质头发的阴影。对于球形对称的黑洞，对于任何观察者来说，阴影都是圆形的，但是阴影大小取决于观察者的运动状态。另一方面，血浆的效果还通过一个简单的模型研究了。光子球的半径取决于血浆模型。最重要的是，我们发现在某些情况下，阴影尺寸不会单调降低。
Seeking singularity free solutions are important for further understanding black holes in quantum level. Recently, a five-dimensional singularity free black hole/topological star was constructed [Phys. Rev. Lett. 126, 151101 (2021)]. Through the Kaluza-Klein reduction, an effective four-dimensional static spherically symmetric charged black hole with scalar hair can be obtained. In this paper, we study shadow of this charged black hole with scalar hair in terms of four kinds of observers, i.e., static observers, surrounding observers, freely falling observers, and escaping observers in four-dimensional spacetime. For a spherically symmetric black hole, the shadow is circular for any observer, but the shadow size depends on the motion status of the observer. On the other hand, the effect of plasma is also investigated by a simple model. The radius of the photon sphere depends on the plasma model. Most importantly, we find that the shadow sizes do not monotonically decrease with $r$ in some cases.
