it isn't photons that are accelerated faster than c when escaping the event horizon surface of a black hole.
it's only theoretically even electromagnetic radiation, per se.
The gas jets of black holes emit "some" form of radiative energy "faster than c." I hadn't heard that Planck's...
I've done some work with the DeSitter and Reimann tensors that leads me to believe that over astronomical durations, the dimensional conservation of Hillbert space can break down by random quantum fluctuation (basically explicable as microwave gravitational vibrations between dimensional branes...