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Comment on "Relativistic covariance and nonlinear quantum mechanics: Tomonaga-Schwinger analysis''
Lajos Diósi·February 6, 2026
Quantum Physics
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Abstract
Contrary to the central claim (Hsu, 2026) published in Physics Letters B, the Tomonaga--Schwinger equation remains covariant despite the nonlinear modification of it. The proof of covariance becomes simple after the loopholes and mistakes in Hsu's arguments are identified.