[simonh]

That's fun. Where did the universe that is collapsing inwards come from, and what is the CMB? Do you have a mathematical treatment of this?

I think the main issue is that the event horizon of a black hole only exists relative to an observer. They're not physically 'real' objects but just theoretical mathematical limits we can calculate. They're 'where the escape velocity becomes c'. As an observer approaches a black hole the apparent event horizon shrinks away from them, in a way directly analogous to a geographical horizon.

[quantadev]

If Big Bang advocates can claim the Big Bang created a whole universe of matter in a single instant as if by magic, then we can likewise make the simpler more scientifically justifiable claim that emptiness spawns tiny bits of matter everywhere, all the time.

The fact that CMB lines up with an explosion theory may simply be that Black Holes are mathematically similar to explosions (i.e. starting small, and growing spherically)

Regarding Event Horizon surface, I say there's something like wave-particle duality going on with this observer v.s. observed paradox. The EH is both a 'surface' and 'not-a-surface' depending on your perspective. Physics is odd enough for these kinds of paradoxes, when there's equal evidence for both viewpoints.