A black hole is a wormhole resulting from a dead Star which is capable of sucking any mass/matter along its path due to Gravity. I was wondering what time would be like at the central point of the wormhole, would it exist at all or would it be faster or slower?
[Physics] Does time exist at the center of a Black Hole
black-holesgeneral-relativitysingularitiesspacetimewormholes
Related Solutions
The event horizon of a black hole is a very weird and complicated place. According to my undergrad GR course, at the event horizon of a black hole, time becomes a space-like coordinates, and space becomes a time-like coordinate. From what I remember, a time-like coordinate is one in which you absolutely have to move forward.
Therefore, beyond the black hole horizon, it is impossible to move backwards in space (away from the black hole) in the same manner as it is impossible to move back in time outside of the horizon.
Does it also mean that it is possible to move through time in both direction (time being a space-like coordinate inside the horizon)? Probably, but then, it's still impossible to get out of the black hole, so no one outside would know!
As a side note, according to the holographic principle, information on all events occuring beyond an event horizon is encoded into the event horizon itself, such that it is irrelevant to try to understand what goes on beyond the event horizon. In fact, the very physical existence of something beyond an event horizon is questionable, since it cannot affect us any much more than the event horizon itself can.
There are numerous misconceptions here, but allow me to address just a few:
Black holes do not have "appetite." In order for an object to be consumed by a black hole, the object's trajectory would need to literally intersect with the event horizon (i.e. be on a collision course with it), otherwise the object will continue to orbit the black hole. Because black holes are extremely compact, it actually makes it relatively difficult for orbiting objects to fall in. Instead, objects might come close to the black hole, and be accelerated to relativistic speeds, which accounts for the energetic phenomena that we observe in the vicinity of black holes.
All of this applies to Sgr A*. Despite how massive it is, it's also very compact. This makes it a relatively rare event to observe a star (or a gas cloud) actually falling into it.
We observe a large cloud of antimatter in the galactic center...
The "cloud of antimatter" to which you refer is not a cloud of antimatter, but a cloud of matter with a smattering of positrons that is slightly greater than elsewhere in the interstellar medium. It's also not quite centered on Sgr A*. For a much more complete answer on this subject see https://physics.stackexchange.com/a/111758/10334.
The universe is expanding with an accelerated speed. This requires energy to be added, and if energy pours in through white holes, energy is added.
...but we don't observe any energy "pouring in" from Sag A*. Furthermore, we know that the repulsive force of dark energy is uniformly distributed throughout space, and not localized to centers of galaxies.
We have never observed any singularity, so why should a black hole singularity exist?
The singularity is, by definition, hidden inside the black hole, which is why we can never observe it.
Best Answer
In standard GR, nothing exists at the center of a black hole. The center of a black hole is a singularity, and because GR fails at that point it is simply removed from the manifold. That means that the singularity is not part of spacetime.
To answer your question more realistically, we believe that GR is an approximate theory that fails well before you reach the center. Unfortunately, we have no good alternative theory with which to answer the question in the region where GR fails. We simply don’t have any data from that regime and it is very hard to formulate a good theory without data. So there very well could be time at the center, but we simply don’t have a good way to even guess.