At the central singularity of the black hole the energy is so high that positrons and electrons, and then quarks and anti-quarks emerge from the vacuum. However, in my opinion they both disappear inside a phase transition brane where the unified field of pure bosons only exist, at the center of the singularity.

I know of no theory that allows matter and anti-matter to exist on opposite sids of the event horizon. The event horizon location depends on where you are. It is a virtual, not an actual thing. For matter at the event horizon that we perceive at a distance, that matter experiences an event horizon much closer to the central singularity. In other words, there is no such thing as a local event horizon. It is just a distant math thing.

If you know differently, please explain.

Richard