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What is Black Hole Photonsphere Radius Limits about?

This document discusses the upper bound on the radii of black-hole photonspheres, demonstrating that for any spherically-symmetric asymptotically flat black-hole spacetime, the radius of the photonsphere is bounded by rγ ≤ 3M, where M is the total ADM mass. The study confirms that this upper bound applies to hairy black-hole configurations and is saturated by the Schwarzschild black-hole. The findings emphasize the significance of photonspheres in understanding black-hole properties and their relation to qu

Author

Steve

Language

EN