system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: New theory says that the Big Bang might not have happened?
gpt
Fancy math applied to Einsteins original theories.  The paper, and the authors aren't like "hey, you are all wrong."  It's more of "hey, look at this model too."  

In short, it's just another idea, that currently is not very accepted.  However that may change.  The bulk of the idea is that the universe is, and always was, and just because we see it expanding, does not mean it all comes back to a singularity.   

Think of finding a not inflated balloon on the ground with knot in it.  While the evidence may suggest it deflated, it is also possible someone just tied a knot in the balloon and left it there.