3 ms·
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 surrou
by 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 agoI understand what an event horizon is. What I don't understand is how you could remove one.
- joeyo 16y agoFrom 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.