If the origin of our current universe-state is just entropy randomly getting insanely-unlikely low and then bouncing back, that would make Big Bang just the random moment where the entropy bounced back.
Like, if you could travel back in time in some magical time machine, you would see the stars being unborn, universe getting smaller, and then at a completely random moment, the time machine would stop and say “this is as far in the past as I can go; from here it is a future in both directions: your time or the antichronos”. And that moment itself would be nothing special: universe much simpler than we are used to, but not literally zero-size. Just how much back the entropy went, before it bounced. Far enough that we had enough time to evolve. On the other hand, every second of the past is extra improbability, so even “five minutes after the universe was zero-size” would be astronomically more likely than “exactly when the universe was zero-size”, and it wouldn’t make a difference for our ability to evolve.
From this perspective, the theories of Big Bang are just an attempt to reverse-engineer how far back could the entropy go in the hypothetical extreme case… but in our specific past, it most likely didn’t go back that far. Like, on the picture with the red curve, Big Bang is a description of the lowest point on the scale, but the curve is more likely to have bounced a few pixels above it.
(Epistemic status: I don’t understand physics, I am just trying to sound smart and possibly interesting.)
If the origin of our current universe-state is just entropy randomly getting insanely-unlikely low and then bouncing back, that would make Big Bang just the random moment where the entropy bounced back.
Like, if you could travel back in time in some magical time machine, you would see the stars being unborn, universe getting smaller, and then at a completely random moment, the time machine would stop and say “this is as far in the past as I can go; from here it is a future in both directions: your time or the antichronos”. And that moment itself would be nothing special: universe much simpler than we are used to, but not literally zero-size. Just how much back the entropy went, before it bounced. Far enough that we had enough time to evolve. On the other hand, every second of the past is extra improbability, so even “five minutes after the universe was zero-size” would be astronomically more likely than “exactly when the universe was zero-size”, and it wouldn’t make a difference for our ability to evolve.
From this perspective, the theories of Big Bang are just an attempt to reverse-engineer how far back could the entropy go in the hypothetical extreme case… but in our specific past, it most likely didn’t go back that far. Like, on the picture with the red curve, Big Bang is a description of the lowest point on the scale, but the curve is more likely to have bounced a few pixels above it.
(Epistemic status: I don’t understand physics, I am just trying to sound smart and possibly interesting.)