I always thought that the "most civilizations just upload and live in a simulated utopia instead of colonizing the universe" response to the Fermi Paradox was obviously wrong, because it would only take ONE civilization breaking this trend to be visible, and regardless of what the aliens are doing, a galaxy of resources is always useful to have. But i was reading somewhere (I don't remember where) about an interesting idea of a super-Turing computer that could calculate anything, regardless of time constraints and ignoring the halting problem. I think the proposal was to use closed time like curves or something.

This, of course, seemed very far-fetched, but the implications are fascinating. It would be possible to use such a device to simulate an eternity in a moment. We could upload and have an eternity of eudaimonia, without ever having to worry about running out of resources or the heat death of the universe or alien superintelligences. Even if the computer was to be destroyed an instant later, it wouldn't matter to us. If such a thing was possible, then that would be an obvious solution to the Fermi Paradox.