论文标题
$ 4D $ EINSTEIN-GAUSS-BONNET重力及其阴影旋转黑洞
Rotating black holes in $4D$ Einstein-Gauss-Bonnet gravity and its shadow
论文作者
论文摘要
最近，对正规化的兴趣激增，Einstein-Gauss-Bonnet（EGB）重力的$ d \至4 $限制，由此产生的正规化$ 4D $ EGB重力具有非平底动力学。该理论承认球形对称的黑洞概括了Schwarzschild黑洞。我们考虑正规化$ 4D $ EGB重力中的旋转黑洞，并讨论他们的地平线特性和阴影铸件。在最近的M87*观测值的背景下，研究了GB耦合参数对阴影的形状和大小的影响。有趣的是，对于给定的自旋参数，由于GB耦合参数，阴影的表观大小降低并更加扭曲。我们发现在有限的参数空间中，例如对于$ a = 0.1m $，$α\ leq 0.00394m^2 $，在当前的观察不确定性中，$ 4D $ EGB重力的旋转黑洞与M87* Black Hole Shadow的推断特征一致。
Recently there has been a surge of interest in regularizing, a $ D \to 4 $ limit of, the Einstein-Gauss-Bonnet (EGB) gravity, and the resulting regularized $4D$ EGB gravity has nontrivial dynamics. The theory admits spherically symmetric black holes generalizing the Schwarzschild black holes. We consider the rotating black hole in regularized $4D$ EGB gravity and discuss their horizon properties and shadow cast. The effects of the GB coupling parameter on the shape and size of shadows are investigated in the context of recent M87* observations from the EHT. Interestingly, for a given spin parameter, the apparent size of the shadow decreases and gets more distorted due to the GB coupling parameter. We find that within the finite parameter space, e.g. for $a=0.1M$, $α\leq 0.00394M^2$, and within the current observational uncertainties, the rotating black holes of the $4D$ EGB gravity are consistent with the inferred features of M87* black hole shadow.
