Comment by runarberg

As I understand it (I‘m not a cosmologist by any means), saying that the observable universe began at big bang simply means that anything that happened before the big bang has no effect on what happens afterwards.

There may be other universes out there, with their own big bangs, but that has no effect on ours.

Reading this article, I think they are simply disputing the necessity of singularity inside a black hole, and hypothesize a universe which expands from non-singularity black hole, while staying inside its own event-horizon.

That is how I understood it at least, somebody please correct me if I misunderstood it.