MadSci Network: Astronomy |
Everything inside of a black hole has been debatable since the idea was postulated. In general, it is safe to say that the definition of the event horizon is that this is the radius from the center of the mass at which time is infinitely dilated. This means that time stands still. A complete stop. What occurs within this region therefore does not occur in a time frame which resembles the common time you and I experience. For instance, the concept of velocity, as your question poses, no longer applies, since velocity requires both distance and time. Distance, in fact, being a spacial dimension, and a time dependent variable, also has no meaning. In Euclidian space, the diameter of the black hole is zero, even though the observed diameter is measured from the event horizon to the event horizon on the opposite side of the mass. The distance from one side to the other is zero. This is conceived by saying that since time is standing still to the observer outside the event horizon, time is infinitely fast inside, and the contraction from being an event horizon to a singularity occurs infinitely fast. Thus, the event horizon occurs for an infiniteley short period of time, at which point it is considered a singularity, whose spacial dimensions are zero, and velocity has no meaning. As for force, these are space-time dependent variables as well. And all of the above applies. Escaping from a singularity is Big Bang physics. To the best of my knowledge, no one has postulated theory which actually goes back to the point of a singularity - all of the theories require a radius slightly larger. Events inside the event horizon in Big Bang theories require other space-time dimensions which do not have characteristics like those we can observe. They have purely theoretical properties. The amount of literature on this subject is extremely vast. In general, look for the names Steven Hawking, Alan Guth, Roger Penrose, and the search term Zero Point Field. That is a good starting point.
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