Naked Science Forum
Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: syhprum on 15/10/2010 22:16:57
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What is the mass of a BH when it reaches the end of its life ?
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I assume it disappears in a burst of radiation
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That is what it is expected to do but there is a possibility that a residual minimum size black hole is stable against evaporation and accretion because it is too small for particles to get in and out. This could form part of dark matter in our universe.
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The temperature of BHs decreases with size, so a residual minimum size BH would also be the hottest a BH could get. I also understand that the rate of Hawking Radiation increases with temperature, so I don't think that such a residual sized BH could be stable.
I believe that it's because of this factor that the folks at the LHC aren't too worried about creating microscopic BHs - they're believed to evaporate as soon as they're created (if they do indeed get created at all).
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from http://xaonon.dyndns.org/hawking/ assuming these rules apply right to the very end.
The mass of a black hole at the start of the last minute of its life is about 1000 metric tons and its luminosity about one millionth of that of the sun. Before this time it was much dimmer. It only manages to get as bright as the sun in the last nanosecond as it uses up its last ton of material.
The explosion is a good bit bigger than a large nuclear weapon but not all that much bigger.