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In article <2358@forty2.physik.unizh.ch>, ks@forty2.physik.unizh.ch
(Kurt Sonnenmoser) writes:
|>In article <1992Sep8.222101.9281@math.ucla.edu> barry@arnold.math.ucla.edu
|>(Barry Merriman) writes:
|>|
|>| What happens if you dump some antimatter into a black 
|>| hole that formed from normal matter? Does it 'cancel out' part of it?
|>|
|>| Or, if I take two black holes, one made from ordinary matter
|>| and the other made from anti-matter, and merge them, what happens?
|>| Do I get a bigger black hole, or are they somehow annihilated?
|>
|>
|>In article <1992Sep9.052443.8026@galois.mit.edu> jbaez@riesz.mit.edu
|>(John C. Baez) writes:
|>>[...]
|>>Anyway, the usual answer is that the "no-hair theorem" shows that the
|>>only properties a black hole has are mass, momentum, angular momentum
|>>and electric charge.  It doesn't know whether you threw matter or
|>>antimatter in.  So if you throw in some matter and then some antimatter,
|>>or a black hole you made out of antimatter, it just keeps getting
|>>bigger.
|>
So what are the implications of this? Does this mean that if a
Quantum no-hair theorem holds that gravitational collapse, ipso facto,
is the source of baryon non-conservation?

Most (All that I have ever seen) "no-hair" theorems are proved for classical
systems. What about quantum systems? If a true quantum description of Hawking
radiation (not just a semi-classical estimate) is finally worked out, is
it not possible for it to depend on "the hair". for example, if a proton/
anti-proton pair is created out of the curvature field just inside the horizon,
will both the proton and anti-proton have exactly the same probability to
tunnel beyond the horizon? Might not these probabilities be affected by the
overall baryon number of the black-hole. Perhaps this is a way to restore
baryon conservation in collapse situations --- then again, black holes may
not respect baryon numbers, even in a complete quantum description.


john w. cobb
"The hair club for Cosmologists". 
      I'm not just the president, but a customer too.