Physicist throws time-travel theories a curve
By Michelle Lefort, USA TODAYWhat do you get when you join a 1981 DeLorean, a "flux capacitor" and a digital dial set to Nov. 5, 1955? If you're the character of Dr. Emmett Brown in the 1985 movie Back to the Future, you've created a time machine.
The possibility of time travel has occupied the fantasies of philosophers, authors, children and directors. But to some physicists, it's more than pure fancy.
In the July issue of Physical Review Letters, Amos Ori, professor of physics at the Technion, the Israel Institute of Technology in Haifa, argues that the laws of physics don't stand in the way of building a time machine.
Ori hasn't created, or even designed, a physical time machine. He instead constructed a situation — a mathematical model — in which the laws of physics will make one for him.
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