发表机构
Institute of Fundamental Physics and Quantum Technology, and School of Physical Science and Technology, Ningbo University; Zhejiang Key Laboratory of Extreme Universe, and BINGO Center, Ningbo University; School of Physics, and Center for High Energy Physics, Peking University（宁波大学基础物理与量子技术研究所和物理科学与技术学院; 宁波大学浙江极端宇宙重点实验室和BINGO中心; 北京大学物理学院和高能物理研究中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究利用黑洞耀斑电影的自相关，通过次级脊的斜率和截距，可区分克尔时空与非克尔时空，对低自旋负形变参数构型的非克尔信号识别具有潜力。
AI 中文摘要
黑洞电影中的自相关编码了引力透镜图像之间的时间延迟和角间距，为检验时空几何提供了一种手段。我们利用具有单一形变参数的参数化Johannsen-Psaltis度规中的轨道热点，研究透镜诱导的相关性区分偏离克尔时空的能力。从光线追踪电影中，我们提取时间-角自相关图中近似线性的次级脊的斜率（k）和截距（b）作为潜在未来可观测量。自旋和度规形变参数的变化在（k,b）平面上产生独特轨迹，当指定轨道半径、观察者倾角和轨道角速度时，这两个可观测量可联合约束这两个参数。通过改变轨道角速度，我们在（k,b）平面构建了克尔参考区域，发现对于一些具有负形变参数的低自旋构型，次级峰的测量斜率-截距对位于该参考区域之外。该特征出现在亚开普勒、开普勒和超开普勒运动中，表明黑洞耀斑电影的次级脊测量有潜力区分非克尔时空信号。
英文摘要
Autocorrelation in black hole movies encodes the time delays and angular separations between gravitationally lensed images, offering a means of testing the spacetime geometry. Using an orbiting hot spot in the parametrized Johannsen-Psaltis metric with a single deformation parameter, we investigate the ability of lensing-induced correlations to distinguish departures from Kerr. From ray-traced movies, we extract the slope (k) and intercept (b) of an approximately linear secondary ridge in the time-angle autocorrelation map as potential future observables. Variations in the spin and the metric deformation parameter produce distinctive trajectories in the (k,b) plane, allowing the two observables to jointly constrain both parameters when the orbital radius, observer inclination, and orbital angular velocity are specified. By varying the orbital angular velocity, we construct a Kerr reference region in the (k,b) plane, and we find that, for some low-spin configurations with negative deformation parameters, the measured slope-intercept pairs of the secondary peaks lie outside this reference region. This feature appears for sub-Keplerian, Keplerian, and super-Keplerian motion, indicating that secondary-ridge measurements from black hole flare movies have the potential to distinguish non-Kerr signatures.
Comments8 pages, 3 figures
