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.
Ananke must above all be regarded as cosmic force , that is as the ruling law in the universe ; thus … the super-personal, cosmic significance of "the All" ruled by Ananke as well, can be accepted as certain. It represents in the universe the inviolability of cause and effect and does so as dual essence, as a mythical personage belonging to the oldest theogony or as the earliest philosophical concept of the mechanics of natural events.
It must be confessed that the new quantum mechanics is far from satisfying the requirements of the layman who seeks to clothe his conceptions in figurative language. Indeed, its originators probably hold that such symbolic representation is inherently impossible. It is earnestly to be hoped that this is not their last word on the subject, and that they may yet be successful in expressing the quantum postulate in picturesque form.H. Stanley Allen
Certainly we do not need quantum mechanics for macroscopic objects, which are well described by classical physics – this is the reason why quantum mechanics seems so foreign to our everyday existence.alain aspect
The laws of classical mechanics represent a mathematical idealization and should not be assumed to correspond to the real laws of nature. ... We now have to realize that errors are inevitable (..) a discovery that makes strict determinism impossible.léon brillouin
On the side of physics, there were a few key figures in Oxford who realized, in all probability unlike the majority of their colleagues in the physics department, that physics without interpretation is only part of the story, and that theories like quantum mechanics need careful foundational reflection.harvey brown
People get a lot of confusion, because they keep trying to think of quantum mechanics as classical mechanicssidney coleman
Quantum mechanics as it stands would be perfect if we didn't have the quantum-gravity issue and a few other very deep fundamental problems.gerardus 't hooft
I liked quantum mechanics very much. The subject was hard to understand but easy to apply to a large number of interesting problems.willis lamb
A gifted experimentalist, and theoretician, in the best Newtonian tradition... His contributions to quantum measurements, and elucidative teachings on quantum mechanics, have not yet received the attention they deserve.willis lamb
In the beginning was mechanics.
Is it not good to know what follows from what, even if it is not necessarily FAPP? [FAPP is Bell's suggested abbreviation of "for all practical purposes."] Suppose for example that quantum mechanics were found to resist precise formulation. Suppose that when formulation beyond FAPP was attempted, we find an unmovable finger obstinately pointing outside the subject, to the mind of the observor, to the Hindu scriptures, to God, or even only Gravitation? Would that not be very, very interesting?john stewart bell
Law, in its most general and comprehensive sense, signifies a rule of action; and is applied indiscriminately to all kinds of action, whether animate, or inanimate, rational or irrational. Thus we say, the laws of motion, of gravitation, of optics, or mechanics, as well as the laws of nature and of nations. And it is that rule of action, which is prescribed by some superior, and which the inferior is bound to obey.william blackstone
Quantum mechanics is certainly imposing. But an inner voice tells me that it is not yet the real thing. The theory says a lot, but does not really bring us any closer to the secret of the "old one." I, at any rate, am convinced that He does not throw dice.
[W]hen Galileo discovered he could use the tools of mathematics and mechanics to understand the motion of celestial bodies, he felt, in the words of one imminent researcher, that he had learned the language in which God recreated the universe . Today we are learning the language in which God created life . We are gaining ever more awe for the complexity, the beauty , the wonder of God's most divine and sacred gift.
To the art of mechanics is owing all sorts of instruments to work with, all engines of war, ships, bridges, mills, curious roofs and arches, stately theatres, columns, pendent galleries, and all other grand works in building. Also clocks, watches, jacks, chariots, carts and carriages, and even the wheel-barrow. Architecture , navigation, husbandry, and military affairs, owe their invention and use to this art.
The underlying physical laws necessary for the mathematical theory of a large part of physics and the whole of chemistry are thus completely known, and the difficulty is only that the exact application of these laws leads to equations much too complicated to be soluble. It therefore becomes desirable that approximate practical methods of applying quantum mechanics should be developed, which can lead to an explanation of the main features of complex atomic systems without too much computation.
Herschel has noticed how the Stagirite obstructed the progress of astronomy by not identifying celestial with terrestrial mechanics, but laying down the principle that celestial motions were regulated by peculiar laws, thus placing them entirely without the pale of experimental research, while at the same time the progress of mechanics was impeded by the [his] assumption of natural and unnatural motions.
In the beginning was mechanics.
All this, the positive and physical essence of mechanics, which makes its chief and highest interest for a student of nature, is in existing treatises completely buried and concealed beneath a mass of technical considerations.
The history of the development of mechanics is quite indispensable to a full comprehension of the science in its present condition. It also affords a simple and instructive example or the processes by which natural science generally is developed.
It is so characteristic, that just when the mechanics of reproduction are so vastly improved, there are fewer and fewer people who know how the music should be played.
In the the past thirty years, what is now known as the science of industrial management has grown from a scattered, almost formless beginning into a well-defined, rapidly developing structure. Today this science bids fair to outstrip in public importance and economic usefulness any one of the great sciences that have been applied to serve mankind. For the science of industrial management is the great super-science that takes mechanics, chemistry, physics, electricity, psychology; and Burbank-like, grafts them all into one great, productive, ever-bearing plant.
No physical theory of local hidden variables can ever reproduce all of the predictions of quantum mechanics.
I think I can safely say that nobody understands quantum mechanics.
All the same, the fundamental truths which govern that art are still unchangeable; just as the principles of mechanics must always govern architecture, whether the building be made of wood, stone, iron or concrete; just as the principles of harmony govern music of whatever kind. It is still necessary, then, to establish the principles of war.
It is only the impossible that is possible for God . He has given over the possible to the mechanics of matter and the autonomy of his creatures.