How could anyone possibly know that there are no as-yet-undiscovered black holes that are bigger than the ones we've already discovered?Why are there no black holes bigger than the ones we've already seen?
The original question was phrased similarly to "Why are there no elephants bigger than the ones we have already seen?"One can't know. One can speculate, which you didn't attempt to do.
Does it? How so? What theory are you referring to?"Why are there no black holes bigger than the ones we've already seen?"
The diameter of a black hole event horizon determines the longest wave length of the radiation it can produce.
The vacuum can't radiate, can it? Are you referring to the microwave background radiation?The thermal temperature of the event horizon can not yet equal the thermal temperature of the surrounding vacuum which is colder and able to radiate at longer wavelengths.
What condition?Conservation of information (things and other stuff) stored on the surface of the horizon in planck length units probably requires the condition.
There's Hawking radiation, which cases mass loss and hence horizon diameter decrease, but that doesn't put a limit on the size of a black hole, as far as I am aware. I can't think of anything that would impose such a limit. Can you suggest any specific mechanism?Something about the vacuum/spacetime/quantum mechanics is forcing them to evaporate to lose mass, limit horizon diameter & the corresponding longest frequency radiating wavelength.
For the same reason the Earth resists inflation: lots of locally concentrated mass overcomes the general tendency to expand with the universe as a whole. If that's what you mean by "inflation".Inflation has made the vacuum colder than the black holes. Why do they resist inflation?
The original question was phrased similarly to "Why are there no elephants bigger than the ones we have already seen?"
Nobody can ever know that they've seen the biggest elephant, or the biggest black hole. That's why your original question didn't make much sense.
It appears you have thought some more about this following my initial response and come up with a more sensible question: is there a limit to the size of black holes? That's one we can discuss.
Does it? How so? What theory are you referring to?
The vacuum can't radiation, can it? Are you referring to the microwave background radiation?
What condition?
There's Hawking radiation, which cases mass loss and hence horizon diameter decrease, but that doesn't put a limit on the size of a black hole, as far as I am aware. I can't think of anything that would impose such a limit. Can you suggest any specific mechanism?
For the same reason the Earth resists inflation: lots of locally concentrated mass overcomes the general tendency to expand with the universe as a whole. If that's what you mean by "inflation".
You didn't need anybody to give you the win. You had it up your sleeve all along.Thank you for the win.