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B Black hole explosions

  1. Nov 27, 2016 #1
    In Hawking's "Black hole explosions?" 1974 letter to Nature, he states:
    My question is: wouldn't it be a terrible idea to generate a black hole of any size in a particle accelerator?

    http://www.nature.com/nature/journal/v248/n5443/abs/248030a0.html
     
  2. jcsd
  3. Nov 27, 2016 #2

    Orodruin

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    You seem to be missing out on the fact that you can never get a black hole evaporation more energetic than whatever you put in the beam.

    Any black hole generated would evaporate extremely fast.
     
  4. Nov 27, 2016 #3
    That makes sense. I guess the key from the letter is "released in the last 0.1 s"; the generated black whole would evaporate in an exponentially shorter time than 0.1 s due its trivial mass. Thanks as always.
     
  5. Nov 27, 2016 #4
    Yes it would, but a particle accelerator can't produce a black hole of any size.
    Tiny ones that are short lived, well maybe.
     
    Last edited: Nov 27, 2016
  6. Nov 28, 2016 #5

    mfb

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    Right. It would evaporate within at most a few Planck times.
    A "tiny one" is a size I think.
    No signs of black holes at the LHC, and theories suggesting that they could be produced were very speculative anyway.
     
  7. Nov 29, 2016 #6

    Chronos

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    The energy necessary to produce a black hole of any size is huge. The smallest possible theoretical mass for a black hole is the planck mass - 1018 GeV. That is far beyond the reach of any existing, or even imagined, collider.
     
  8. Nov 29, 2016 #7

    mfb

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    If there is no new physics below the Planck scale. Extra dimensions or other additional things could make the Planck scale much lower, and allow black hole formation with a few TeV - in the range of the LHC.
     
  9. Nov 29, 2016 #8

    Chronos

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    Agreed, my observations are constrained to physics as currently known.
     
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