Strange solids called temporal metamaterials finally make it possible to investigate the controversial idea of quantum friction – and push special relativity to its limits
For an experiment designed to reverse time, the apparatus was surprisingly simple: little more than a tank of water. With a puff of air to disturb the surface, Emmanuel Fort created a set of ripples moving outwards in concentric circles.
The key to these bizarre materials isn’t so much the careful engineering of their spatial arrangement of atoms, but how they work in the fourth dimension,. Like the rapid jolting of the water tank, temporal metamaterials can radically change their properties in the blink of an eye. This creates a kind of boundary that acts like a mirror in time – and it is this that exerts such subtle power over waves.
Superdeterminism makes sense of the quantum world by suggesting it is not as random as it seems, but critics say it undermines the whole premise of science. Does the idea deserve its terrible reputation? Not only are these materials a mind-bending invention, they have also become an unexpectedly rich playground in which physicists can test a raft of fundamental ideas at their limits. What happens when you send quantum particles through a slit in time? Does friction really exist in the quantum world? And can we…New Scientist
Electromagnetism Materials Science Light
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