“It is widely believed that in our quantum world physical facts about occurrences in space time must be grounded in the wave function. There are several long recognized and much discussed difficulties with this view.”

— Detlef Dürr

Daniel Bedingham, Detlef Dürr, GianCarlo Ghirardi, Sheldon Goldstein, Roderich Tumulka, Nino Zanghì, "Matter Density and Relativistic Models of Wave Function Collapse", J Stat Phys (2014) 154:623–631

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Detlef Dürr 1

German mathematician and physicist 1951

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“The main difficulty in popularizing quantum physics is that we do not really know how to make images of it in our world. In this sense it is really counterintuitive.”

Alain Aspect (1947) French physicist

La principale difficulté pour vulgariser la physique quantique, c'est qu'on ne sait pas très bien comment en fabriquer des images dans notre monde. C'est en ce sens qu'elle est vraiment contre-intuitive.
Interview http://www.canalacademie.com/Alain-Aspect.html on the occasion of the CNRS Gold Medal Award Ceremony in December 2005.

“No one, who knows what the difficulties are, now believes that the crisis of physics is likely to be resolved by any simple trick or modification of existing theories. Something radical is needed, and it will have to go far wider than physics. A new world outlook is being forged, but much experiment and argument will be needed before it can take a definitive form. It must be coherent, it must include and illuminate the new knowledge of fundamental particles and their complex fields, it must resolve the paradoxes of wave and particle, it must make the world inside the atom and the wide spaces of the universe equally intelligible. It must have a different dimension from all previous world views, and include in itself an explanation of development and the origin of new things. In this it will fall naturally in line with the converging tendencies of the biological and social sciences in which a regular pattern blends with their evolutionary history.”

John Desmond Bernal (1901–1971) British scientist

J.D. Bernal (1959/1969) Science in history Vol 3. p. 862; cited in: Ludwig von Bertalanffy (1968) General System Theory. p. 5-6

“Ironically, conventional quantum mechanics itself involves a vast expansion of physical reality, which may be enough to avoid Einstein Insanity. The equations of quantum dynamics allow physicists to predict the future values of the wave function, given its present value. According to the Schrödinger equation, the wave function evolves in a completely predictable way. But in practice we never have access to the full wave function, either at present or in the future, so this “predictability” is unattainable. If the wave function provides the ultimate description of reality — a controversial issue!”

Frank Wilczek (1951) physicist

we must conclude that “God plays a deep yet strictly rule-based game, which looks like dice to us.”
Einstein’s Parable of Quantum Insanity (2015)

“For an exercise, then, imagine for a while that the subjective world of your thoughts, feelings, inner images and fantasies represent the 'rockbed reality' from which individual physical events emerge. Look at the world for a change from the inside out, so to speak. Imagine that physical experience is somehow the materialization of your own subjective reality. Forget what you have learned about reactions and stimuli. Ignore for a time everything you have believed and see your thoughts as the real events. Try to view normal physical occurrences as the concrete physical reactions in space and time to your own feelings and beliefs. For indeed your subjective world causes your physical experience.”

Jane Roberts (1929–1984) American Writer

Session 830, Page 148
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“One of the evident facts about the world is the stability of empty space-time. In classical general relativity we can explain this as a consequence of the positive energy theorem… the positive energy theorem must extend in some suitable form to any viable quantum theory of gravity.”

Lee Smolin (1955) American cosmologist

"Positive energy in quantum gravity" arXiv (Jun 10, 2014)

“The main interest of physical statistics lies in fact not so much in the distribution of the phenomena in space, but rather in their succession in time.”

Richard von Mises (1883–1953) Austrian physicist and mathematician

Sixth Lecture, Statistical Problems in Physics, p. 187
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“It seems to me that we must make a distinction between what is "objective" and what is "measurable" in discussing the question of physical reality, according to quantum mechanics.”

Roger Penrose book The Emperor's New Mind

Source: The Emperor's New Mind (1989), Ch. 6, Quantum Magic and Quantum Mastery, p. 269.
Context: It seems to me that we must make a distinction between what is "objective" and what is "measurable" in discussing the question of physical reality, according to quantum mechanics. The state-vector of a system is, indeed, not measurable, in the sense that one cannot ascertain, by experiments performed on the system, precisely (up to proportionality) what the state is; but the state-vector does seem to be (again up to proportionality) a completely objective property of the system, being completely characterized by the results it must give to experiments that one might perform.

“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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“It has been generally believed that only the complex numbers could legitimately be used as the ground field in discussing quantum-mechanical operators. Over the complex field, Frobenius' theorem is of course not valid; the only division algebra over the complex field is formed by the complex numbers themselves. However, Frobenius' theorem is relevant precisely because the appropriate ground field for much of quantum mechanics is real rather than complex.”

Freeman Dyson (1923) theoretical physicist and mathematician

[The threefold way: algebraic structure of symmetry groups and ensembles in quantum mechanics, Jour. Math. Phys., 3, 1962, 1199–1215, https://books.google.com/books?id=nnyNUidX1OMC&pg=PA410] (p. 1200)

“The physical "reality" is assumed to be the wave function of the whole universe itself.”

Hugh Everett (1930–1982) American physicist, author of the many-worlds interpretation of quantum mechanics

in an early draft of his doctoral dissertation (1950s).

“It is widely believed that in our quantum world physical facts about occurrences in space time must be grounded in the wave function. There are several long recognized and much discussed difficulties with this view.”

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Detlef Dürr 1

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