Time crystals could behave almost like perpetual motion machines

(PhysOrg.com) -- As every young science student knows, moving objects have kinetic energy. But just how much energy does something need to move? In a new study, a pair of physicists has shown that it’s theoretically possible for a system in its lowest energy state, or ground state, to exhibit periodic motion. This periodically moving system can be thought of as the temporal equivalent of a crystal, which is defined by its spatial periodicity. What’s even more intriguing about these "time crystals" is that, by exhibiting motion at their state of lowest energy, they break a fundamental symmetry called time translation symmetry and become "perilously close" to looking like perpetual motion machines.

Time crystals could behave almost like perpetual motion machines

(PhysOrg.com) -- As every young science student knows, moving objects have kinetic energy. But just how much energy does something need to move? In a new study, a pair of physicists has shown ...

Mon 20 Feb 12 from Phys.org

Physicists Predict The Existence of Time Crystals

If crystals exist in spatial dimensions, then they ought to exist in the dimension of time too, says Nobel prize-winning physicist One of the most powerful ideas in modern physics is that the ...

Thu 16 Feb 12 from MIT Technology Review

Crystals may be possible in time as well as space

Theory proposes objects in their lowest energy state can loop in the fourth dimension forever

Thu 16 Feb 12 from ScienceNews

Perpetual Motion 'Time Crystals' May Exist, Physicist Says

A famous physicist has discovered time crystals, theoretically possible objects that are a cross between diamonds and clocks.

Tue 21 Feb 12 from Livescience

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