- #1
Gerinski
- 323
- 15
I don't know if this question makes any sense, sorry if it doesn't.
I have often read that any matter (say an object, for more mundane clarity) falling into a black hole (providing it radiated) would be perceived by an outside observer as never actually crossing the event horizon. It's "image" would become more and more redshifted, to a point where at the event horizon it looks as infinitely redshifted, because there space itself "falls into the black hole" at a rate equal to the speed of light.
Now, the CMBR is also dramatically resdhifted, but not infinitely, only up to 3 K. This kind of suggests to me that a black hole's surface area would appear even more redshifted than the background CMBR which fills up space, it would effectively appear redshifted to 0 K.
Is this reasoning correct? Could we spot black holes by looking at points where the redshifting is even higher than for the CMBR itself? (I can guess that we do not have the technological resolution for that, but just in theory). So that looking at the CMBR in very fine detail, finding "holes" in it which represent points of even lower temperature, zero K precisely instead of 3 K, could help in locating black holes?
Thanks
I have often read that any matter (say an object, for more mundane clarity) falling into a black hole (providing it radiated) would be perceived by an outside observer as never actually crossing the event horizon. It's "image" would become more and more redshifted, to a point where at the event horizon it looks as infinitely redshifted, because there space itself "falls into the black hole" at a rate equal to the speed of light.
Now, the CMBR is also dramatically resdhifted, but not infinitely, only up to 3 K. This kind of suggests to me that a black hole's surface area would appear even more redshifted than the background CMBR which fills up space, it would effectively appear redshifted to 0 K.
Is this reasoning correct? Could we spot black holes by looking at points where the redshifting is even higher than for the CMBR itself? (I can guess that we do not have the technological resolution for that, but just in theory). So that looking at the CMBR in very fine detail, finding "holes" in it which represent points of even lower temperature, zero K precisely instead of 3 K, could help in locating black holes?
Thanks