An experiment published in Physical Review Letters shows that particles can exhibit effectively negative interaction times.A new study confirmed the existence of negative time in controlled experiments, but this does not mean that it is possible to travel back into the past.In classical physics, the notion of time is associated with a direction known as the arrow of time, which points from the past to the future. This behaviour is linked to the …
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Researchers managed to get a photon out of a field of atoms before it entered. By reading this sentence twice, it does not mean anything, but on a subatomic scale, the notions before and after no longer hold.