Comments on: ``Weinberg's Nonlinear Quantum Mechanics and Einstein-Podolsky-Rosen paradox'', by Joseph Polchinski
Abstract
Contrary to the opinion of J. Polchinski [Phys.Rev.Lett. 66, 397-400 (1991)], the phenomenon of superluminal messages in nonlinear versions of quantum mechanics is not a specific difficulty in a class of theories formulated by S. Weinberg [Ann.Phys. (N.Y.), 194, 336-386 (1989)]. It appears in all schemes which try to enlarge the orthodox class of observables, while conserving the traditional structure of the pure and mixed states.
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