Definitely the latter, there's no way to say it's impossible, just incredibly unlikely. It's easy to imagine a universe in which it is possible, and that univer

Definitely the latter, there's no way to say it's impossible, just incredibly unlikely. It's easy to imagine a universe in which it is possible, and that universe could be consistent with the math. The big "but" however is that our universe has none of the features we'd expect from one with the necessary curvature or exotic matter/energy. Does that make sense? I mean, if we discover that there are multiple universes, or that Block Universe is true.... who knows? Even then however, I suspect we'd run into something like Novikov Self-Consistency Principle, or we'd have noticed time travel by now.