Jabberwocky
Frumious Bandersnatch
. I can get the idea of going back in time consciously (and I go so far as to say there's probably more than one way to do that). But physically? Or going physically back in time, changing or having something physically changed, and then returning to the so-called present with said physical changes still in place? It's above my pay grade such level of understanding or comprehension I'm afraid.
If one could see reality as one whole that is infinite expression of itself than physical expression is just another expression of the same oneness (call it what you want). If you can imagine that reality is self refreshing moment that expands in every conceivable direction and degree of expression (like water, air, ice...are essentially the same just another degree and you extrapolate to all other "material" expressions), than you could at least imagine that time is in that respect static. From the perspective of infinity time does not exist. If you can get the idea "of going back in time consciously" than you should have no further problem imagining how getting to any other point in time physically is possible. Just try not to make divisions between expressions. Physical is same as spiritual, body is not different than mind. Just like green is not really different than red. They are colours. Use that kind of reasoning to all expressions and you could imagine how all this could be true.
But if you really understand all that then one should ask - if all is one expression of same oneness, why should I try to change any state? Every state is equally valuable so what's the need for changing it so radically. That is - what are your real motives. And in the end - who this "you" really is and why that "I" wants to change it's expression so radically...if every point is the center, every I is the origin and the expression.
Sorry for the rant. It is an interesting question for my particular point of view.