Physicists Create Elusive Particles That Remember Their Pasts

Forty years ago, Frank Wilczek was mulling over a bizarre type of particle that could live only in a flat universe. Had he put pen to paper and done the calculations, Wilczek would have found that these then-theoretical particles held an otherworldly memory of their past, one woven too thoroughly into the fabric of reality for any one disturbance to erase it. However, seeing no reason that nature…

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