Quote from: wolfekeeper
As the event horizon tries to form in the first place any matter inside gets expelled.This statement seems to imply that gravitation gets reversed during the formation of a black hole. That seems to violate everything we know about gravitation (without actually having a validated theory of quantum gravity).
As I understand it, gravitation always attracts and never repels. The material on a 1-way trajectory towards the center of a black hole doesn't suddenly reverse direction (I exclude elliptical orbits that do not intersect the event horizon).
Part of the problem is that different frames of reference will see different things as a test particle approaches an event horizon of radius (say) 10km:
- From the frame of reference of a test particle approaching the singularity: It will speed up to a significant fraction of c, and pass the the 10km radius in a short time, without experiencing anything special.
- From the frame of reference of a distant observer: A test particle approaching the singularity will speed up to a significant fraction of c, but will continue to emit severely red-shifted photons from just outside the 10km event horizon, for (potentially) a long time.
- However, while an event horizon is growing, my guess is that any photons emitted from an infalling particle will find themselves inside the new event horizon, and will not reach a distant observer.