People also used to think that the electrons going around atoms would very quickly fall into the nucleus due to electromagnetic radiation. But Quantum Man came to save the day! I suspect that if there is anything to this Milne universe idea, then something analogous in QM will save it. At 01:53 PM 10/22/2013, Charles Greathouse wrote:
Wouldn't an electron-black hole evaporate (essentially) instantly through Hawking radiation?
The Schwarzschild evaporation time would be https://www.google.com/search?q=mass+of+an+electron^3+*+5120*2*pi^2*G^2%2F%28Planck%27s+constant*c^4%29
I don't know the equivalent Kerr-Newman equation (maybe someone can help me out here?) but I wouldn't expect it to be much longer. Surely there is an answer, else this solution would not have been proposed.
Charles Greathouse Analyst/Programmer Case Western Reserve University
On Tue, Oct 22, 2013 at 4:05 PM, Henry Baker <hbaker1@pipeline.com> wrote:
I did some more Googling & found that this is a subject of active research; i.e., no one knows what happens when a fast-spinning black hole acquires too much material.
Specifically, a spinning black hole is known as a "Kerr black hole", and there is a "Kerr Limit" to how fast a Kerr black hole can spin. One of the problems of an "extreme" Kerr black hole (a Kerr black hole having maximum spin) is that the singularity -- which is a circular ring for a Kerr black hole -- approaches the event horizon from the inside and lies on the surface for an extreme Kerr black hole.
But nature is apparently modest; "cosmic censorship" is invoked to hide all singularities behind event horizons. Cosmic censorship would imply that extreme Kerr black holes cannot exist.
So what happens to a Kerr black hole that somehow gets too big? How does it disintegrate? No one knows.
Apparently, a Kerr black hole cannot accumulate material incrementally; the physics seems to push particles away when the Kerr black hole approaches the Kerr limit. But no one knows if similar sized black holes can merge to form an extreme Kerr black hole.
Kerr black holes carry up to 29% of their energy in their spin; ALL of this energy can be extracted (thereby producing a spinless black hole) using techniques such as a "Penrose process"; however, extracting all of this energy may take an infinite amount of time.
Kerr black holes "frame drag" their surrounding space-time, so that it is impossible to remain stationary next to a Kerr black hole, no matter how much thrust your rocket has. Since all of the spin energy of a Kerr black hole can be extracted, this energy obviously lies OUTSIDE the event horizon within the "dragged frame". Ditto for the angular momentum ??
Because the singularity of a Kerr black hole is a circular ring, it should be possible to go through it. Unfortunately, all of this happens inside the event horizon so you wouldn't be able to communicate any results to anyone outside.
There are apparently "closed timelike curves" (CTC's) associated with Kerr black holes, which might conceivably be connected with "time travel".
http://en.wikipedia.org/wiki/Closed_timelike_curve
There's even a really cool, but really far-out proposal called "A symmetric matter-antimatter Milne Universe", in which particles like electrons are little Kerr black holes (with charge, obviously):
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