Time travel, can occur due to quantum states between the two “sides.” If there is one subset of the population who never enters the quantum state of the other side of the star. Nematicity, specifically.
“The upshot of nematicity is that the traffic patterns of electrons—and the quantum rules that cause the patterns—may be quite different for electrons flowing right-to-left, along the long axis of the rectangles, than for the electrons flowing up-and-down along the short axis. “
MIT