I think you have a fundamental misunderstanding about how science works. Pop culture tends to regard scientists as interchangeable with Tolkien-esque wizards, mysterious figures locked away in remote towers, isolated from humanity as they struggle to understand arcane forces. But that's not how scientists operate in reality. Science is a strongly collaborative enterprise - we advance by discussing ideas and arguing amongst ourselves. Loners don't get the cross-pollination of ideas, and they don't tend to advance so fast. So the idea of "private science" is a science fiction concept.
Don't get me wrong, I don't doubt that there are (for example) intelligence agencies that know stuff about cryptography that's ahead of public knowledge. But these are in specific areas where they have built on public knowledge for specific tactical goals. I can't imagine fundamental research being done that way. And how would you keep it secret? It's a rare scientific discovery when there aren't other people almost there (see Alfred Russel Wallace, Henri Poincare, and David Hilbert, for example).
If there isn't public information on the creation of the universe, it's because we haven't figured it out yet. And time travel is likely impossible.