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Topic: Science > Physics
User: "tetrahedron"
Date: 06 Jan 2005 08:18:42 PM
Object: Spin
Puppet_Sock wrote:

tetrahedron wrote:

1) Does anyone have an explanation of the differences among particles
with different spin?


Sure. Here's the capsule version. Spin has to do with what
representation of the rotation group the particle sits in.
Let's see if we can work with that a bit.

Thanks. This explains the rotation description.
Bjoern Feuerbacher wrote:

What is not intuitive about "intrinsic angular momentum"?

I can't see how the "definition" agrees with the "description".

So far, I've only come across two kinds of intuitive definition of
spin. The first way was to consider a particle with spin 1 an object
that returns to the same appearance when it undergoes a complete
rotation, spin 2 when half a rotation was enough to return to the
starting look (or was it 2 rotations?),


Half.

What about spin-1/2 and spin 3/2 fermions?
Etc. I'm particularly interested in particles with spin 0: I get the
impression these must behave in a weird (totally asymmetric) way.


Where do you get that idea from?

spin * #rotations = 1
Or does the spin-0 particle simply look the same in every
circumstance? Besides some mesons, I don't know of any such particle
physically observed.

(locally/globally)?


I don't see what the behaviour of spin 0 bosons has to
do with the handedness with the universe, and also don't
understand what you mean with "local" and "global" handedness.

Me either, I'm trying to broaden my understanding and find
connections.
Best regards
.

User: "G=EMC^2 Glazier"

Title: Re: Spin 07 Jan 2005 06:05:18 AM
Hi Tet Spin in the QM realm is very tricky. Like it would not be an
electron if it was not spinning. Than QM tells us an electron is a
"point" particle. We know the central point of a spinning frisbee do not
move.. If something is truly pointlike ,though it has "no other points"
that lie off any purported spin axis That is rather puzzling,but "what
the hell" its QM. We picture electrons like the Earth both
revolve,and rotate. Its in our "id" with its macro classical
expectations The "M" in QM is not the same mechanical structure as we
see how things work in our very large macro realm dimensions we are
immersed in. I have my own "spin" theory called "Spin is in" I see
spin as an intrinsic property of both micro,and macro realms of our
universe. I see the electron spinning at "c" and nothing can change its
rate of spin. Matter particles,and anti- matter particles all have spin
equal to the electron,and going with the language of QM these particles
all have "spin one half" That begs the question "What is the value of
one half"? In QM that is a measure of how quickly electrons rotate. So
we can relate that to photons,weak gauge bosons,and gluons they " spin
one' and that tells us they are spinning twice as fast as matter
particles. Graviton has spin 2,and that's twice as fast as a photon. I
find no fault in thinking QM spin as our classical spin (like a top)
Still I know QM is tricky stuff Bert
.


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