4 ms·

"[..] removing the event horizon around a black hole[..]" If somebody could take the time to explain this I would very much appreciate it.

• stretchwithme 16y ago
  not sure exactly what you need to have explained, but wikipedia say the event horizon is "an event horizon is a boundary in spacetime, most often an area surrounding a black hole, beyond which events cannot affect an outside observer." so if you could remove the event horizon somehow, you could see what's going on with the black hole. It would look smaller too, because light from behind the black hole could get here, rather than being pulled in to the hole.
  • mpk 16y ago
    I understand what an event horizon is. What I don't understand is how you could remove one.
    • joeyo 16y ago
      From the article: M^2 >= (J/M)^2 + Q^2 M is the mass of the black hole, J is its angular momentum, and Q is its charge. If the inequality is satisfied, that is it has sufficiently more mass than angular momentum and charge, then the black hole has an event horizon. However if the inequality is violated, either because of additional charge, or angular momentum, or both, then the black hole would have no event horizon and would exist as a naked singularity. This is generally regarded as a nonphysical solution-- large charged bodies tend not to exist in nature, and presumably any body that had sufficient angular momentum to push the black hole into violating the inequality would also have sufficient angular momentum to avoid falling into the back hole as well, but the authors of the paper have apparently devised some situation where the blackhole can be pushed into such a regime.
• keefe 16y ago
  I found this kind of a very odd statement. Isn't the event horizon a consequence of the stuff going on underneath? The image I have in my mind is of water draining out of the tub and wanting to strip off the top layer of water to see what's "going on" inside the whirlpool, when of course stripping off one top only reveals another and so forth.