AI 中文总结
研究通过在克尔度规引入偏差参数构建的约翰森 - 萨尔蒂什黑洞成像特征，采用数值反向光线追踪模拟，研究其图像结构、强度分布等与偏差参数的关系，还对非封闭视界JP黑洞图像中扩展内阴影的形成机制进行了研究。
AI 中文摘要
约翰森 - 萨尔蒂什（JP）度规通过在克尔度规中引入偏差参数构建。这些偏差参数为测试天体物理黑洞与克尔范式的一致程度及检验无毛定理的有效性提供了额外自由度。黑洞成像能直接探测天体物理黑洞性质，所以对JP黑洞成像特征的详细研究是利用JP度规探索天体物理黑洞系统中与克尔几何潜在偏差的首要步骤。因此，采用数值反向光线追踪模拟全面研究了具有封闭和非封闭事件视界的JP黑洞的图像结构、强度分布和红移 - 蓝移特征，并系统研究了这些成像特征对偏差参数的依赖性。此外，在具有非封闭事件视界的JP黑洞图像中出现了不同于原始黑洞内阴影的扩展内阴影，为此利用数值反向光线追踪模拟和近似解析框架对其物理形成机制进行了详细研究。
英文摘要
The Johannsen-Psaltis (JP) metric is constructed by introducing deviation parameters into the Kerr metric. The presence of these deviation parameters provides additional degrees of freedom for testing the extent to which astrophysical black holes are consistent with the Kerr paradigm and for examining the validity of the no-hair theorem. Since black hole imaging provides one of the most direct means of probing the properties of astrophysical black holes, a detailed investigation of the imaging characteristics of JP black holes constitutes a natural first step toward employing the JP metric to explore potential deviations from the Kerr geometry in astrophysical black hole systems. Accordingly, numerical backward ray-tracing simulations are employed to conduct a comprehensive investigation of the image structures, intensity distributions, and redshift-blueshift signatures of JP black holes with both closed and non-closed event horizons. The dependence of these imaging characteristics on the deviation parameter is also investigated systematically. Furthermore, the emergence of an extended inner shadow, distinct from the original inner shadow of the black hole, in images of JP black holes with non-closed event horizons motivated a detailed investigation of its physical formation mechanism using both numerical backward ray-tracing simulations and an approximate analytical framework.
Comments123 pages, 25 figures
