Why should it be impossible to measure?
Hawking radiation is only relevant for an observer in the gravity field around the black hole (equivalent to acceleration in empty space). Someone who is falling into the black whole sees no radiation at all according to Einstein (equivalent of an inertial observer in relative motion in empty space).
What do you mean by that? The accelerated observer will radiate a kind of Cherenkov radiation? And that radiation will fall into the virtual black hole? In that case I must be radiating at this moment too, because I am in the gravity field of the earth. interesting, but does matter (without any other kind of charge, only mass) radiate when accelerated?
Dimsun.


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