My question: What (physical or mathematical) reasons (not philosophical) do some physicists ('t Hooft, Penrose, Smolin,...) argue/have in order to think that Quantum Mechanics could be substituted by another theory in the future? Namely...Why should it be an effective and non-fundamental (``non-ultimate'') theory? 't Hooft has spent some years trying to "prove" that Quantum Mechanics can arise from a classical theory with information loss through some particular examples (cellular automata, beable theory,...). Penrose advocated long ago that gravity should have a role in the quantum wave function collapse (the so called objective reduction), Smolin wrote a paper titled , I believe, Can Quantum Mechanics be the approximation of another theory?. What I am asking for is WHY, if every observation and experiment is consistent (till now) with Quantum Mechanics/Quantum Field Theory, people are trying to go beyond traditional QM/QFT for mainly "philosophical?" reasons. Is it due to the collapse of wavefunctions? Is it due to the probabilistic interpretation? Maybe is it due to entanglement? The absence of quantum gravity? Giving up philosophical prejudices, I want to UNDERSTAND the reason/s behind those works...
Remark: Currently, there is no experiment against it! Quite to the contrary, entanglement, uncertainty relationships, QFT calculations and precision measurements and lots of "quantum effects" rest into the correction of Quantum Mechanics. From a pure positivist framework is quite crazy such an opposition!
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