Moreover, the information given by EHT can be used to impose constraints on particle physics via the mechanism of superradiance. The black hole companion for M87* can also be constrained through the image released by EHT. The shadows of high-redshift supermassive black holes may serve as the standard rulers, whereby the cosmological parameters can be constrained.
For instance, the extra dimensions could be determined from the shadow of M87*, where a rotating braneworld black hole was considered. Since the release of the image and data by EHT, its various implications have been explored. It is generally known that the shadows of spherically symmetric black holes are round and those of rotating black holes are not precisely round but deformed. So far, the shadows of various black holes have been investigated. The intensity of the light observed by the distant observer differs accordingly, leading to a dark interior and bright ring. Specifically, when light emitting from the accretion passes through the vicinity of the black hole toward the observer, its trajectory will be deflected. The shadow of a black hole is caused by gravitational light deflection. The dark interior is called a black hole shadow while the bright ring is called a photon ring. The image shows that there is a dark interior with a bright ring surrounding it. The Event Horizon Telescope (EHT) Collaboration has recently obtained an ultra high angular resolution image of the accretion flow around the supermassive black hole in M87*.
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