I don't think there are any theories based on black holes exploding. That doesn't say anything about black holes exploding nor, as far as I can see about black holes at the centre of galaxies. From the mass of the star that collapsed to form the black hole. (And, in that highly speculative, purely theoretical paper, they would be 4D stars.) Mass is ejected from the accretion disk around black holes, not from the black hole itself. None of this seems to have any connecti
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