1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Black holes, Creating Black holes

  1. Jun 21, 2013 #1
    Hello everybody, I am a first year physics student and I've got two more questions.

    Assuming that particles in a black holes event horizon have huge kinetic energy, if they collide, can't they create a black hole? I am asking that, because if we have a probability or pontentially be able to create a really small black hole at CERN (because of the high in energy particles), how about black holes being created, in a black hole's event horizon?

    Also, shouldn't the mass and energy in a black hole's event horizon, be even bigger than that of the black hole on its own? If we apply special relativity on a black holes event horizon, shouldn't objects mass there become huge, and hence their sum huge too?

    Thanks in advance :)
     
  2. jcsd
  3. Jun 21, 2013 #2

    WannabeNewton

    User Avatar
    Science Advisor

    1. Black holes in GR form due to massive gravitational collapse. That gravitational collapse leads to black holes can be proven mathematically, more or less.

    2. The energy of a particle is not necessarily "unboundedly large" inside a black hole. For example in Schwarzschild space-time, free falling particles have a conserved energy ##E## along their trajectory. If the particle starts out free falling at infinity with some initial energy ##E## then this will remain constant along the particle's worldline (all of this valid before the worldline terminates at a physical singulairty of course).

    3. The mass of a black hole accounts for everything contained in the black hole. A free falling observer infalling into a black hole will contribute to its overall mass. In the observer's own frame will, he/she simply fall through with nothing special happening (assuming tidal forces are not significant enough to rip apart the observer before he/she falls through).
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Black holes, Creating Black holes
Loading...