If time does indeed come to a stop at the event horizon, how are we even able to observe it? Wouldn't it cease to exist to someone moving through time the moment time comes to a halt on the event horizon?
It does not, at least not in the way you probably imagine.If time does indeed come to a stop at the event horizon
We cannot observe things at or behind the event horizon. That is the point of event horizons.how are we even able to observe it?
Does something stop existing if you don't look at it? This gets a bit philosophical, but I don't think it makes sense to say it would stop existing just because you cannot see it any more.Wouldn't it cease to exist to someone
It does not. The point is that the event horizon is a null surface, which means that there are no observers that are at rest at the event horizon.If time does indeed come to a stop at the event horizon
No. There are jets, but those are produced well outside the black hole, from matter that comes close to it and then gets accelerated away by electromagnetic forces.Isn't there white light emanating from the black hole when observed through a telescope?
No, and that concept does not even make sense. Locally, you never notice effects - you can always check your watch and see time ticking it at a rate of 1 second per second.Wouldn't time eventually stop once the infaller got close enough?
Can you explain this a little more, in more laymans terms?
A distant observer watching a flashing light approaching the event horizon will see the flashes becoming longer and longer
until it reaches the event horizon where it will no longer flash, just stay lit or unlit depending if the light arrives on a flash or not.
Ok so far.
This is not what the distant observer will see. The distant observer will just see flashes spaced farther and farther apart, and the flashes he sees will have been emitted closer and closer to the horizon, but never at it. Once the distant observer sees the last flash emitted before the light reaches the horizon, he sees nothing more at all. A flash emitted right on the horizon stays at the horizon forever; it never gets back out to the distant observer, so that observer never sees it. Flashes emitted inside the horizon eventually hit the singularity.
We expect that it will.What is the thinking on the existence of the singularity? It seems completely unphysical, but can't be transformed away like a coordinate singularity. Do we hope that it will disappear with quantum gravity? Thanks
What is the thinking on the existence of the singularity? It seems completely unphysical, but can't be transformed away like a coordinate singularity. Do we hope that it will disappear with quantum gravity? Thanks
According to general relativity, the gravitational collapse of a sufficiently compact mass forms a singular black hole. In the Einstein–Cartan theory, instead, the collapse reaches a bounce and forms a regular Einstein-Rosen bridge (wormhole) to a new, growing universe on the other side of the event horizon.
Since the Einstein–Cartan theory is purely classical, it also does not fully address the issue of quantum gravity. In the Einstein–Cartan theory, the Dirac equation becomes nonlinear and therefore the superposition principle used in usual quantization techniques would not work. Recently, interest in Einstein–Cartan theory has been driven toward cosmological implications, most importantly, the avoidance of a gravitational singularity at the beginning of the universe. The theory is considered viable and remains an active topic in the physics community.
do you mean torsion? this would mean somehow measuring predictions relating to particle spin?
There seem to be so many gravity theories compared to anything else.