There are no accepted answers to your question. However, I like to think that string theorists have it right and matter is sort of crushed so completely that you’re just left with a roiling sea of primordial energy - a scalar field, aka, a new universe. It is in my opinion likely that black holes are the holographic medium on which a universe can be projected. String theory supports this thought; it posits that black holes are “fuzz balls”, aka: a mass of unimaginable energy vibrating in many dimensions, aka: a universe. It is a simple, elegant explanation for why the universe exists, and where it came from.
But that is all extremely hypothetical. Like I said, there are no answers here… yet. There’s a lot of good science to back up that thought, but none of it is falsifiable with our current understanding of physics. We probably need a theory of quantum gravity to start answering these questions.
There are no accepted answers to your question. However, I like to think that string theorists have it right and matter is sort of crushed so completely that you’re just left with a roiling sea of primordial energy - a scalar field, aka, a new universe. It is in my opinion likely that black holes are the holographic medium on which a universe can be projected. String theory supports this thought; it posits that black holes are “fuzz balls”, aka: a mass of unimaginable energy vibrating in many dimensions, aka: a universe. It is a simple, elegant explanation for why the universe exists, and where it came from.
But that is all extremely hypothetical. Like I said, there are no answers here… yet. There’s a lot of good science to back up that thought, but none of it is falsifiable with our current understanding of physics. We probably need a theory of quantum gravity to start answering these questions.