What is the mass of a BH when it reaches the end of its life?

  • 4 Replies
  • 1686 Views

0 Members and 1 Guest are viewing this topic.

*

Offline syhprum

  • Neilep Level Member
  • ******
  • 3898
    • View Profile
What is the mass of a BH when it reaches the end of its life ?
« Last Edit: 16/10/2010 04:16:13 by JP »
syhprum

*

Offline syhprum

  • Neilep Level Member
  • ******
  • 3898
    • View Profile
I assume it disappears in a burst of radiation
syhprum

*

Offline Soul Surfer

  • Neilep Level Member
  • ******
  • 3345
  • keep banging the rocks together
    • View Profile
    • ian kimber's web workspace
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.
Learn, create, test and tell
evolution rules in all things
God says so!

*

Offline LeeE

  • Neilep Level Member
  • ******
  • 3382
    • View Profile
    • Spatial
What is the mass of a BH when it reaches the end of its life?
« Reply #3 on: 16/10/2010 19:15:14 »
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).
...And its claws are as big as cups, and for some reason it's got a tremendous fear of stamps! And Mrs Doyle was telling me it's got magnets on its tail, so if you're made out of metal it can attach itself to you! And instead of a mouth it's got four arses!

*

Offline Soul Surfer

  • Neilep Level Member
  • ******
  • 3345
  • keep banging the rocks together
    • View Profile
    • ian kimber's web workspace
What is the mass of a BH when it reaches the end of its life?
« Reply #4 on: 16/10/2010 23:06:34 »
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.
« Last Edit: 16/10/2010 23:32:46 by Soul Surfer »
Learn, create, test and tell
evolution rules in all things
God says so!