论文标题
黑洞阴影与柔软的头发
Black Hole Shadow with Soft Hair
论文作者
论文摘要
黑洞周围的强力弯曲的光弯曲将形成所谓的黑洞阴影，其形状可以使近野体几何形状的结构亮起，以揭示出强力和黑洞的新型物理。在这项工作中，我们同时采用分析和射线追踪方法在存在重力理论的红外结构的情况下研究黑洞阴影，这表明时空的渐近对称性是黑孔的超透明柔软的头发。尽管带有和不含柔软头发的黑洞指标与大型尺度转换有关，但与阴影形状相关的近地平线几何形状却大不相同。此外，大地测量的哈密顿量似乎本质上有所不同，即由于柔软的头发破坏了球形对称性而导致的可分离性。通过应用射线追踪计算，我们发现柔软的头发虽然不影响阴影的形状，但可能会改变阴影的平均大小和位置。还讨论了由柔软的头发黑洞带有周围积聚流的图像。
Light bending by the strong gravity around the black hole will form the so-called black hole shadow, the shape of which can shed light on the structure of the near-horizon geometry to possibly reveal novel physics of strong gravity and black hole. In this work, we adopt both analytical and ray-tracing methods to study the black hole shadow in the presence of the infrared structure of gravity theory, which manifests the asymptotic symmetries of spacetime as the supertranslation soft hairs of the black hole. Though the black hole metrics with and without the soft hair are related by large gauge transformations, the near horizon geometries relevant for the shape of the shadow are quite different. Moreover, the Hamiltonian for the geodesic seems intrinsically different, i.e., the loss of separability due to the breaking of spherical symmetry by soft hair. By applying ray-tracing computations, we find that the soft hair, although not affecting the shape of the shadow, may change the average size and position of the shadow. Images resulting from soft hair black holes with surrounding accretion flows are also discussed.
