10:57 AM
@CramerTV As I said to UKMonkey, in theory a kugelblitz (a black hole built from light) doesn't require an intermediate stage of matter. If you can get a high enough concentration of photons in a small enough space the energy density will warp the spacetime into a black hole. However, when light intensity is extreme it's possible for some of the light to convert to pairs of matter + antimatter particles, principally electrons & positrons.
We don't really know what happens at the heart of a black hole, we need a theory of Quantum Gravity to answer such questions. But we're fairly confident that normal matter particles can't exist there, and that standard General Relativity gives correct results for what's happening there, until you get down to distances much smaller than an atom.
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Discussion on answer by John Rennie: …
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