Mass isn't conserved when the system does not move (more precisely its momentum is 0) and it exchanges energy with the environment. But where is this different with a system which momentum changes because of external forces or its energy changes because it exchanges some energy with the...
Yes, after having looked up for the Higgs Boson's properties and found it has spin = 0 it was clear. But I didn't do it before answering physika because I considered his question as provocative.
Thanks, anyway.
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Lightarrow
I looked up now. It has spin 0, not that "has no spin".
"The colour blue" has "no spin", for example.
Even to say "a photon has no mass" is a language misuse; but physicists understand what it means. Laymen instead don't.
For this reason I prefer to say:
"has zero mass"
"has spin 0"
etc.
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Some examples (or even one)?
I don't know much about it. Can you give me a link to (a free access to) such a document?
Why "arbitrary"? I believed to have shown the functioning.
Don't know how to explain better than that.
Of course.
Ok, yes you are right, I illustrated just the two limiting...
1) I can't understand what you mean with "why not is the question I would ask". Yes, if I use other angles the split will not be equal. But, until someone compute the probabilities of detection with this "interpretation" we don't know if it can be correct, at least for this experimental setting...
I would disconnect the concepts "frame of reference" and "observer" because you can "observe" every phenomenon in the frame of reference you choose.
Anyway I don't like the term "observe" or "observer" because they belongs to optics. I prefer "measure/analyze in the X frame".
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Lightarrow
Sorry, don't know how an Higgs boson behave in a Stern-Gerlach apparatus, we were talking of the usual Ag atoms of the standard experiment.
In my vision, if these atoms were prepared in the z+ state, then an apparatus (the magnet made in that way) which is Y oriented (that is, orthogonal to Z...
I would name "intrinsic" those properties as mass, charge, spin, which are frame invariant and "not intrinsic" what is not frame invariant, but it's terminology. Don't know the meaning you attribute to the word "ontology" here: momentum is a (very real) physical quantity.
Because what "counts"...
1) I know, but to me, the real mystery is (Sakurai's book on QM helped me understand this) when we measure the u component of spin after the system has been prepared in the v+ component orthogonal to u: if the system really has ("really" in the sense of "intrinsically" or in some other sense I...
1) Never written "it has no magnetic moment". I've written, it has no magnetic moment "in the z+ direction" and "in the z_ direction" (unless the system is already in the up, or down, eigenstate of magnetic moment, of course).
2) Yes, the records are changes affecting the device only...
1) No, with "had no property" I intended "had not z+ (or z-) magnetic moment".
2) "interaction with the instrument" is a thing, "instrument affecting the system so that it creates the measured property" is another. A photon which is in a 50/50 superposition of polarization states along x and...
1) Ok
2) "Hidden" in the sense of ontologies like De Broglie - Bohm interpretation?
3) Ok.
4) Of course after the first experiment, selecting the beam which goes up, the state goes in z+ eigenstate. By definition. If "the particle had no property" before this first measurement you can...