“When investigating theories at the tiniest conceivable scales in nature, almost all researchers today revert to the quantum language, accepting the verdict from the Copenhagen doctrine that the only way to describe what is going on will always involve states in HIlbert space, controlled by operator equations.”

— Gerardus 't Hooft

The Cellular Automaton Interpretation of Quantum Mechanics, 21 December 2015, arXiv:1405.1548v3 https://arxiv.org/abs/1405.1548,

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Gerardus 't Hooft8

Dutch theoretical physicist and Nobel Prize winner 1946

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“It is often stated that of all the theories proposed in this century, the silliest is quantum theory. In fact, some say that the only thing that quantum theory has going for it is that it is unquestionably correct.”

Michio Kaku book Hyperspace

Source: Hyperspace (1995), Ch.12 Colliding Universes

“Quantum phenomena do not occur in a Hilbert space. They occur in a laboratory.”

Asher Peres (1934–2005) Israeli physicist

[Asher Peres, Quantum theory: concepts and methods, Springer, 1995, 0792336321, 373]

“Although quantum theory involves the use of nonlocal states, such as wave packets and entangled states, there is nothing in the theory, or in the real world so far as it is accurately described by quantum theory, that corresponds to the sorts of instantaneous nonlocal influences which have often been thought to arise in the situation envisaged in the EPR paradox, or implied by the fact that quantum theory violates Bell inequalities.”

Robert Griffiths (physicist)

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“The improved understanding of the equations of hydrodynamics is general in nature; it applies to all quantum field theories, including those like quantum chromodynamics that are of interest to real world experiments.”

Shiraz Minwalla (1972) Indian physicist

Interview in The Hindu (2013)
Context: The improved understanding of the equations of hydrodynamics is general in nature; it applies to all quantum field theories, including those like quantum chromodynamics that are of interest to real world experiments. I think this is a good (though minor) example of the impact of string theory on experiments. At our current stage of understanding of string theory, we can effectively do calculations only in particularly simple — particularly symmetric — theories. But we are able to analyse these theories very completely; do the calculations completely correctly. We can then use these calculations to test various general predictions about the behaviour of all quantum field theories. These expectations sometimes turn out to be incorrect. With the string calculations to guide you can then correct these predictions. The corrected general expectations then apply to all quantum field theories, not just those very symmetric ones that string theory is able to analyse in detail.

“The Society for General Systems Theory and its publication General Systems was a mixed bag. Few authors were actually doing research - they philosophized, and many prematurely resolved dilemmas by mathematical equations in a language poorly understood by the empirical investigator.”

Roy R. Grinker, Sr. (1900–1993) American psychiatrist and neurologist

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“The traditional “cosmological” Multiverse considers that there might be physical realms inaccessible to us due to their separation in space-time. The quantum Multiverse arises from entities that occupy the same space-time, but are distant in Hilbert space – or in the jargon, decoherent.”

Frank Wilczek (1951) physicist

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“Quantum theory may be formulated using Hilbert spaces over any of the three associative normed division algebras: the real numbers, the complex numbers and the quaternions. Indeed, these three choices appear naturally in a number of axiomatic approaches. However, there are internal problems with real or quaternionic quantum theory. Here we argue that these problems can be resolved if we treat real, complex and quaternionic quantum theory as part of a unified structure. Dyson called this structure the "three-fold way"…. This three-fold classification sheds light on the physics of time reversal symmetry, and it already plays an important role in particle physics.”

John C. Baez (1961) American mathematician and mathematical physicist

“Quantum theory was split up into dialects. Different people describe the same experiences in remarkably different languages. This is confusing even to physicists.”

David Finkelstein (1929–2016) American physicist

in Physical Process and Physical Law, in an edition by [Timothy E. Eastman, Hank Keeton, Physics and Whitehead: quantum, process, and experience, SUNY Press, 2004, 0791459136, 181]

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François Englert (1932) Belgian theoretical physicist

page 19 of [2002, A brief course in spontaneous symmetry breaking ii. modern times: The BEH mechanism, arXiv preprint hep-th/0203097, https://arxiv.org/pdf/hep-th/0203097.pdf]

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Gerardus 't Hooft8

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