Big Bounce vs Big Bang

[Alex K]

The article is not about our universe recontracting but rather our big bang actually being the result of a previous contraction. I don't think it would necessarily play out exactly the same way as its past mirror version, but since we don't know where quantum randomness really comes from, I don't think there is any way to say for sure.

So there must be non causality in order for it to not play out the same as its mirror past?

Non-causality (or let's say, non-deterministic quantum physics) is one thing that would keep it from playing out identically, but it isn't the only possibility. There could simply be some accidental asymmetry between the ends of the bounce. We know that the fundamental laws of physics are not exactly Time-Reversal-Invariant (as evidenced by the asymmetric decays of K-Mesons, D-Mesons and B-Mesons), so that isn't a stretch either. I'd say all things considered, it seems unlikely that it would be an exact mirror image.