In a new peer-reviewed paper, a senior honors undergraduate says he has mathematically proven the physical feasibility of a specific kind of time travel. The paper appears in Classical and Quantum Gravity.
University of Queensland student Germain Tobar, who the university's press release calls "prodigious," worked with UQ physics professor Fabio Costa on this paper. In "Reversible dynamics with closed time-like curves and freedom of choice," Tobar and Costa say they've found a middle ground in mathematics that solves a major logical paradox in one model of time travel. Let's dig in.
The math itself is complex, but it boils down to something fairly simple. Time travel discussion focuses on closed time-like curves (CTCs), something Albert Einstein first posited. And Tobar and Costa say that as long as just two pieces of an entire scenario within a CTC are still in "causal order" when you leave, the rest is subject to local free will.
"Our results show that CTCs are not only compatible with determinism and with the local 'free choice' of operations, but also with a rich and diverse range of scenarios and dynamical processes," their paper concludes.
 In a new peer-reviewed paper, a senior honors undergraduate says he has mathematically proven the physical feasibility of a specific kind of time travel. The paper appears in Classical and Quantum Gravity.
University of Queensland student Germain Tobar, who the university's press release calls "prodigious," worked with UQ physics professor Fabio Costa on this paper. In "Reversible dynamics with closed time-like curves and freedom of choice," Tobar and Costa say they've found a middle ground in mathematics that solves a major logical paradox in one model of time travel. Let's dig in.
The math itself is complex, but it boils down to something fairly simple. Time travel discussion focuses on closed time-like curves (CTCs), something Albert Einstein first posited. And Tobar and Costa say that as long as just two pieces of an entire scenario within a CTC are still in "causal order" when you leave, the rest is subject to local free will.
"Our results show that CTCs are not only compatible with determinism and with the local 'free choice' of operations, but also with a rich and diverse range of scenarios and dynamical processes," their paper concludes. You'll look sharp—and feel confident—when your wardrobe is freshly pressed and wrinkle-free. Sporting comprehensive refinements, Subaru's rally car for the road is a brilliant daily driver while maintaining the ability to obliterate any road or trail you throw at it. Slashing your risk of winter slips and falls is easy with these simple tools. A flotilla of missile-armed ships and amphibious forces means Russia could invade Ukraine from all possible directions. Wireless doorbells run off batteries and are easier to set up, but nothing tops a hardwired connection directly to a transformer. |
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