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by raverbashing
3139 days ago
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> But a black hole is a purely gravitational object, there need not be any normal matter involved. There's no "purely gravitational object" it only "looks like that" from behind the event horizon We know the escape velocity > c and that's pretty much it, for GR it's a singularity (which usually means the theory is incomplete in that circumstance) and we don't know how QM work when squeezed harder than a Neutron star > The mass of a black hole is something that's really only defined from a distance away. If you mean "we can sense the gravitational field of something having mass X at a distance D larger than the event horizon" I agree. But I'd rather say "we don't know what happens there" instead of "singularity" (which is what the current theories say it's inside and from the point of view of Relativity they're not wrong) |
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It depends on what framework you're working in. If you're working in general relativity, there's a singularity and absolutely nothing else---no matter at all. If you're talking about the "real world" you can ask: Is GR reliable for these situations, especially in light of quantum-gravitational puzzles? I think you agree that we don't know the answer. But we can say what the GR answers are.