“It appears dubious whether a field theory can account for the atomistic structure of matter and radiation as well as of quantum phenomena.”

— Albert Einstein

(1955) as quoted in Some strangeness in the proportion: a centennial symposium to celebrate the achievements of Albert Einstein (1980) Addison-Wesley Pub. Co., Advanced Book Program.
1950s

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Albert Einstein 702

German-born physicist and founder of the theory of relativi… 1879–1955

Michael Green (physicist) (1946) British physicist

“…we see a number of sophisticated, yet uneducated, theoreticians who are conversant in the LSZ formalism of the Heisenberg field operators, but do not know why an excited atom radiates, or are ignorant of the quantum theoretic deerivation of Rayleigh's law that accounts for the blueness of the sky.”

J. J. Sakurai (1933–1982) American physicist

Modern Quantum Mechanics, Second Edition, Addison-Wesley, 2011.

“Before the quantum theory appeared, the principle of the uniformity of nature - that like causes produce like effects - had been accepted as a universal and indisputable fact of science. As soon as the atomicity of radiation became established, this principle had to be discarded.”

James Jeans (1877–1946) British mathematician and astronomer

Physics and Philosophy (1942)

“It is a test of true theories not only to account for but to predict phenomena.”

William Whewell (1794–1866) English philosopher & historian of science

Aphorism 39.
Philosophy of the Inductive Sciences (1840)

“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

“When you look at a vacuum in a quantum theory of fields, it isn't exactly nothing.”

Peter Higgs (1929) British physicist

in video Meet Peter Higgs http://cdsweb.cern.ch/record/1019670 by CERN (July 2004).

“The classical mechanics had envisaged the world constructed of matter and radiation, the matter consisting of atoms and the radiation of waves. Planck's theory called for an atomicity of radiation similar to that which was so well established for matter. It supposed that radiation was not discharged from matter in a steady stream like water from a hose, but rather like lead from a machine-gun; it came off in separate chunks which Planck called quanta. This… carried tremendous philosophical consequences.”

James Jeans (1877–1946) British mathematician and astronomer

Physics and Philosophy (1942)

“Heisenberg finds that facts of observation lead uniquely and inevitably to the theoretical structure known as matrix mechanics. This shows that the total radiation in any region of empty space can change only by a single complete quantum at a time. Thus not only in the photo-electric phenomenon, but in all other transfers of energy through space, energy is always transferred by complete quanta; fractions of a quantum can never occur. This brings atomicity into our picture of radiation just as definitely as the discovery of the electron and its standard charge brought atomicity into our picture of matter and of electricity.”

James Jeans (1877–1946) British mathematician and astronomer

Physics and Philosophy (1942)

“It can be argued that in trying to see behind the formal predictions of quantum theory we are just making trouble for ourselves. Was not precisely this the lesson that had to be learned before quantum mechanics could be constructed, that it is futile to try to see behind the observed phenomena?”

John S. Bell (1928–1990) Northern Irish physicist

"Einstein-Podolsky-Rosen Experiments", included in Speakable and Unspeakable in Quantum Mechanics (1987), p. 82 https://books.google.com/books?id=FGnnHxh2YtQC&pg=PA82

“Combine general relativity and quantum theory into a single theory that can claim to be the complete theory of nature. This is called the problem of quantum gravity.”

Lee Smolin (1955) American cosmologist

The Trouble With Physics: The Rise of String Theory, The Fall of a Science, and What Comes Next (2007)

“It appears dubious whether a field theory can account for the atomistic structure of matter and radiation as well as of quantum phenomena.”

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Albert Einstein 702

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