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quote:Originally posted by DoctorBeaverI've just been reading about how light from the proximity of a black hole gets red-shifted from visible light to infra-red to radio waves. How far down the spectrum can this process go? Is it possible to red-shift light so far that it has zero frequency? If so, what exactly would that mean? Would it entail the photon having zero energy? Would it cease to exist? Or would it transform into something else?
quote:If light has zero frequency, then you are talking about constant electric charge (i.e. no fluctuation in the field). By the time this would happen in a black hole, I suspect the particle emitting the photon would have reached the event horizon of the black hole, so you'd never get to see this happening.
quote:Originally posted by DoctorBeaverWhat about at the instant the whatever-it-is crosses the event horizon? Would a photon emitted at that exact moment be red-shifted to such an extent?
quote:I don't think a photon can have zero energy. If it did it would be still, that means we can determine exactly where is it, which according to the Heisenburg uncertainty principle, is not possible.
quote:Originally posted by Soul SurferI have already said that there is no reason why the laws of phyisics shouldnt be much the same inside a black hole as outside so let is consider this collapsing material inside this event horizon capsule containing normal space. as it collapses the gravity gradient increases and as Stephen Hawking showed a grvity gradient causes the emission of energy in the form of hawking radiation. as the collapse progresses this gradient gets steeper and the radiation gets more and more energetic. OK this radiatio zooms out to eventually fall back ont the hole but that doesnt matter it still causes a loss of energy from the rest of the collapsing material eventually the radiation into the event horizon cavity should balance the emission from the gradient surface and a stable state is reached.
quote:Originally posted by Soul SurferI agree that this could look something like conditions just before the big bang and I m reasonably confident that our universe is probably an example of the sort of thing that happens inside a black hole but there's a long way to go before we can say that.