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Abstract said:It is shown how possible corrections to ordinary quantum mechanics described by the Lindblad equation might be detected by exploiting the great precision of atomic clocks.

It's a short paper (6 pgs of text), arguing for objective collapse (a la GRW/Diosi-Penrose/etc) instead of Copenhagen/MWI. Based on Ramsey-method atomic clocks frequency measurements, Weinberg gives upper limits (based on Ramsey transition times) for objective collapse below which the scheme is already ruled out experimentally. He also proposes two different ways in which objective collapse can be sought out further in future atomic clock experiments.