>also consistent with an interpretation where the universe with its entire Time-line is a fixed object... That sounds like block time, but in that case I think

>also consistent with an interpretation where the universe with its entire Time-line is a fixed object... That sounds like block time, but in that case I think the operative part is "fixed object", so there would be no concept of changing the past or having multiple time lines. If there were a loop, it would "always" have been there. One interpretation I quite like is the idea that objects travel through time just as they do through space, and so if you went back to a past time there would be nothing there. All the matter is in the 'now' on a trajectory into the future, and both the past and future are the time equivalent of empty space.