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Originally Posted by Dave2042
I think we are coming at this from slightly different angles. I was simply thinking about the theory side of things (ie does the maths of GR apply), whereas you seem to be thinking more practically about what one would experience inside S, which I'd agree is a whole lot less certain.
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It's case of making sense of the mathematics and making predictions that can be supported or refuted through observation or experiment.
BH properties such as mass, charge or spin are characteristics that we can measure as observers outside the horizon.
Knowledge of BHs at a fundamental level is completely lacking.
We don't know what BHs are made out of.
Do BHs violate the Pauli Exclusion Principle?
Then there is space-time inside the S-radius. Since the time like and spatial like terms of the Schwarszchild metric become interchanged the velocity of particles can exceed c with all the associated logical paradoxes that would occur outside the horizon.
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That said, I still feel a bit more 'optimistic' than you. If I recall correctly (GR classes 20 years ago), the 'standard' way of looking at this is that in the frame of reference of the observer inside the black hole, nothing much changes as you cross the event horizon, other than that you become unable to stop moving towards the singularity. That seems comprehensible to me.
Interested to hear if that's not actually the case.
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That may be comprehensible but let's replace the observer with a photon just inside the horizon that has been scattered away from the singularity. According to the maths, the photon is now travelling back into it's own past before it scattered.... but the scattering process sent it in that direction hence a logical paradox.
Space time inside the horizon is a very weird place.
Regards
Steven