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Gerinski

- 323

- 15

Inside a black hole, just below the Schwarzschild's radius, matter density should be high enough as to also slow down light? If so, besides the usual description that it's gravity's spacetime curvature which traps any light emitted from within the Schwarzschild radius preventing it from escaping, could the slowing down due to matter density be also a contributing factor in light being unable to escape? so in fact the hole could become black even with a mass a bit lower than that required for the spacetime curvature effect alone?

Of course I don't know if the interior of the black hole can be considered 'transparent' or 'opaque', but this is linked to some comment I read that the density at the Schwartzschild radius of some black holes can be similar to that of water:

https://www.physicsforums.com/threads/density-of-supermassive-black-holes.483191/