While even Crichton admits such time travel dreams require lots of scientific fact stretching, Clarkson University physicist Lawrence S. Schulman, Ph.D., is putting a new scientific spin on science fiction. Typically, physics says this isn't allowed. A person in either system would view a person in one with an opposite arrow as getting younger, from his or her own perspective. He's probably wrong. He's piled speculation upon speculation.
Physics thrives on teasing apart outrageous and delicious paradoxes.
That's how real science is done. Although this is a novel conceptual view of time in a macroscopic system, a localized region in the universe would have to be observed for new physical laws to prevail. Our assumptions are that the laws do not change depending upon your location in the universe. If that's a pun, all the better.