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Moving mass backwards through time isn't strictly mathematically disallowed. Idk what it's going to look like when it arrives, though.
What does a Tachyon even look like?
i didn't mean purely mathematically. but from the physics standpoint. in other words, if you provide enough dark energy and shape it into a specific configuration, it will generate space-time where time travel is possible in practice.
"How much ya got?"
"Well, it's a purely theoretical substance. But theoretically we've got more of that than all the regular energy in the known universe."
I want to say that'll be the easy part, but I guess it really depends how abstract of a shape we're talking about and how malleable dark energy ends up being.