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Originally Posted by g__day
No, e=mc^2 (in simplified form ignoring momentum for particles with no rest mass), seems pretty solid, but I was saying in a quantum mechanics framework matter or energy can do very, very wierd things - we're do you think that the Universe came from under the Big Bang if it wasn't a quantum fluctation of extraordinary magnitude?
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Who knows? A "quantum fluctuation of extraordinary magnitude" may be one possibility, but it's a particularly unpleasant one to consider IMHO. If our universe was created this way, then there is an anti-universe somewhere just waiting to annihalate ours, and it could do so at any time without our ability to detect or predict it. It is in the realm of philosophy not science.
Quote:
Originally Posted by g__day
And if a pair of opposite virtual particles get created and one is swallowed by the black hole so the other escapes as a real particles then the universe now has a higher energy density +1 to normal spaceimte in the universe and +1 to blackhole. For the blackhole's gravitational field increases even if anti matter is swallowed (unless I'm just entirely sleep deprived)!
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No, sorry, I don't agree. For the the quantum foam to produce the matter/antimatter pair, the energy had to exist in the universe anyway. For every such pair produced in this way, is it not just as likely that a pair was absorbed by the cosmic foam in the same way? I'm not aware that quantum fluctuations are not an irreversible process. Statistically, quantum fluctuations cancel out.
So I suggest, if the matter/antimatter pair were separated as you describe, the anti particle would annihalate a corresponding matter particle to produce energy, but the total amount of mass/energy in the universe (including the black hole) remains constant.
Quote:
Originally Posted by g__day
Is a blackhole part of our Universe? Well at least partly it must be. By this I mean it exists in a reality beyond relativity within its event horizon (say for instance the inside is at the energy densities that it is a realm entirely ruled by quantum gravity and the four forces have re-combined back into one). It is unclear then how this inside the event horizon interacts with normal spacetime ruled by relativity, or any other realities beyond spacetime within our universe that it may be connects with.
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My interpretation is that a black hole is part of our universe, albeit a part we cannot observe the inside of from here.
I know Hawkling has produced mathematical models of what goes on inside black holes but these are even bordering on philosophy. It is all done with extrapolation of the laws of nature as we observe them. As I imagine you are well aware, extrapolation is much less precise (and sometimes very dangerous) than interpolation. Until we work out a way to observe through the event horizon, any theories about what is on the inside of a black hole are far from concrete, because the conditions there differ so immensely from the conditions in which we have developed the laws of nature. Philosophically, all sorts of things could be possible, but scientifically we can say it's a black hole and speculate about what's inside. I have no idea if there's any other sort of "reality" inside a black hole... maybe it's more of the same (simply unable to be observed due to the extreme curvature of space/time at the event horizon), maybe it's bizarrely different. The question is a philosophical one based on today's science.
Al.