论文标题
二次dhost理论中的非正式kerr黑洞的阴影
Shadow of a disformal Kerr black hole in quadratic DHOST theories
论文作者
论文摘要
我们已经研究了具有额外变形参数的Disformal Kerr黑洞的阴影，该参数属于二次退化高阶标量张量（DOHOST）理论中的非保健旋转解决方案。我们的结果表明，带有任意自旋参数的黑洞的变形参数随着变形参数而增加。但是，变形参数对阴影形状的影响在很大程度上取决于黑洞的旋转参数和变形参数的符号。黑洞的阴影形状变化变得更加不同，旋转速度更快，而负变形参数越来越快。尤其是，对于具有负变形参数的近极点黑洞，阴影中存在类似“花梗”的结构，该结构随着变形参数的绝对值而增加。眉毛状的阴影和自相似的分形结构也出现在DHOST理论中的Disformal Kerr Black Hole的阴影中。源自标量场的黑洞阴影中的这些特征可以帮助我们理解非保健的非传染性Kerr Black Hole和Quadratic Dhost理论。
We have studied the shadow of a disformal Kerr black hole with an extra deformation parameter, which belongs to non-stealth rotating solutions in quadratic Degenerate Higher Order Scalar Tensor (DHOST) theory. Our result show that the size of the shadow increases with the deformation parameter for the black hole with arbitrary spin parameter. However, the effect of the deformation parameter on the shadow shape depends heavily on the spin parameter of black hole and the sign of the deformation parameter. The change of the shadow shape becomes more distinct for the black hole with the more quickly rotation and the more negative deformation parameter. Especially, for the near-extreme black hole with negative deformation parameter, there exist a "pedicel"-like structure appeared in the shadow, which increases with the absolute value of deformation parameter. The eyebrow-like shadow and the self-similar fractal structures also appear in the shadow for the disformal Kerr black hole in DHOST theory. These features in the black hole shadow originating from the scalar field could help us to understand the non-stealth disformal Kerr black hole and quadratic DHOST theory.
