In another thread, PF member "SelfAdjoint" made the following comment: ...and indeed you see papers suggesting non-linear replacements for QM and nonlocal replacements for relativity... I am interesting in reading such papers that "suggest" non-linear replacements for quantum mechanics (QM). Would anyone know of internet links ? Also, I have a question, if in fact it can be shown that reality is non-linear (not unitary), would not such an experiment falsify QM as a valid theory, since by its definition QM requires that quantum realities be unitary ? Thanks for helping me better understand a very complex topic.