Re: rotation of electron
- From: Charles Francis <charles@xxxxxxxxxxxxxxxx>
- Date: Sun, 22 Jan 2006 21:59:40 +0000 (UTC)
Thus spake georgie <gderise@xxxxxxx>
>When Feynman was at Cornell while eating lunch in the cafeteria he
>observed a student throwing a plate and noticed that the blue school
>logo spun around faster than the wobble of the plate. For the fun of it
>he worked out the equation of motion which showed that if the wobble is
>small the blue logo goes around twice as fast as the wobble. When asked
>why he was doing this he responded, "It hasn't any use. I'm just
>doing it for the fun of it."
>
>Feynman: "and I started to play with this rotation, and the rotation
>led me to a similar problem of the rotation of an electron according to
>Dirac's equation, and that just led me back into quantum
>electrodynamics, which was the problem I had been working on."
> (From: No Ordinary Genius, The Illustrated Richard Feynman.
>Christopher Sykes. Norton. 1994 p.72.)
>
>
>This seems like it's related to spinors but I can't find any
>reference to this "rotation" of the electron in any of my QFT
>books. Any comments?
He is talking of the property of the phase of the electron wave function
under rotation; phase rotates by half the amount of the rotation.
Regards
--
Charles Francis
Please reply by name
.
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