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Analytical models calculate visibility of photon rings around black holes, suggesting new insights on space-time properties.
General relativity predicts the existence of an infinite number of nested photon rings around black holes, each containing information about the properties of curved space-time. In this paper, analytical models of a thick Gaussian asymmetric photon ring are developed and the visibility function with baselines up to six Earth diameters is calculated.
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S. V. Chernov (2026) studied this question.
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