In three previous posts, I discussed whether time travel is possible.
This paper, just posted on the ArXiv, argues that time travel into the past is logically incompatible with quantum mechanics. Here is the abstract:
Because closed timelike curves are consistent with general relativity, many have asserted that time travel into the past is physically possible if not technologically infeasible. However, the possibility of time travel into the past rests on the unstated and false assumption that zero change to the past implies zero change to the present. I show that this assumption is logically inconsistent; as such, it renders time travel into the past both unscientific and pseudoscientific.