A dark point inside a beam of light should not be much of a traveler. Yet in a new experiment, some of those points appeared to move faster than light itself, darting through a wave field before blinking out of existence. The feat did not involve particles, signals, or any loophole in Einstein’s theory. What the team tracked were optical phase singularities, tiny places where the amplitude of a light wave falls to zero. They are points of comple…
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