Can anyone explain the physical meaning of spin in QM?

[ZapperZ]

``I would recommend learning'' the difference between a model and a theory. There is no Standard Theory of the Standard Model. There is the Stochastic theory of the standard model, the Copenhagen theory of the standard model, the Many Worlds theory of the standard model, etc, etc. (yes and the afore mentioned Bohmian theory) (As there is a plethera I do believe views is a more relavant word, but they are, in effect, theories of the nature of Nature. )

A plethera of theories is not a fundamental (singular) theory of nature!

There is a difference between the accuracy of a model and its representation as fundamental to the nature of Nature.
(What makes a good model vs what makes a fundamental theory?)

There is a difference between the behavior and the particle.
(How does it inter-act [inter->between multi-object effect] vs What is a photon [singular].)

There is a difference between mathematics and physics.
(How is behavior termed spin modeled vs What is spin?)

There is a difference between knowledge and understanding.
(What it means if I can do the math vs what can be infered or not from the math.)

``and words have grown so false I loath prove reason with them.''

Let's not get into semantics here. In many cases, "model" and "theory" in physics is the same thing. If you are arguing about the usage of the label, it tends to indicate that you do not understand the physics. Since this is in the physics section of PF and not, say, the philosophy forum, pay attention to the physics and not the English label being used as the "placecard" for the physics.

If this line of discussion continues, this thread will be locked.

Zz.