The step heights and periodicities of the black-hole photon-ring staircase in the visibility function depend in a calculable way on the Rezzolla-Zhidenko metric parameters.
Comment on the Analytical Bounds in the Rezzolla-Zhidenko Parametrization
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In this short note, we briefly comment on the analytical bounds that must be imposed on the parameter space of the Rezzolla-Zhidenko (RZ) metric-parametrization approach introduced in Ref. [1]. We hope this will clarify some of the confusion recently emerged on this issue [2].
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Interferometric signature of higher-order images in a parametrized framework
The step heights and periodicities of the black-hole photon-ring staircase in the visibility function depend in a calculable way on the Rezzolla-Zhidenko metric parameters.