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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?
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)!
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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