关于检验Kerr黑洞假设的Cardoso-Pani-Rico参数化的注记
Note on the Cardoso-Pani-Rico parametrization to test the Kerr black hole hypothesis
摘要：
构造一个描述天体物理黑洞候选者周围时空几何的通用参数化模型是检验Kerr黑洞假设的重要步骤。在过去的几年里，Johannsen-Psaltis度规一直是最常见的框架，以研究可能偏离克尔解决方案与目前和不久的将来的观察。最近，Cardoso，Pani和Rico提出了一个更一般的参数化。本文的目的是在一个特定的背景下，即几何薄和光学厚的吸积盘的热谱研究这个新的度量。最相关的发现是，看起来像非常快速旋转的克尔黑洞的物体周围的时空几何可能仍然与克尔解有很大的偏差。约翰森-普萨尔蒂斯度规则不是这样，这意味着后者缺少了一类重要的非克尔时空。
英文摘要：
The construction of a generic parametrization to describe the spacetime geometry around astrophysical black hole candidates is an important step to test the Kerr black hole hypothesis. In the last few years, the Johannsen-Psaltis metric has been the most common framework to study possible deviations from the Kerr solution with present and near future observations. Recently, Cardoso, Pani and Rico have proposed a more general parametrization. The aim of the present paper is to study this new metric in a specific context, namely the thermal spectrum of geometrically thin and optically thick accretion disks. The most relevant finding is that the spacetime geometry around objects that look like very fast-rotating Kerr black holes may still have large deviations from the Kerr solution. This was not the case with the Johannsen-Psaltis metric, which means the latter was missing an important class of non-Kerr spacetimes.
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