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> it's like a hand - it comes back to itself after 720° of rotation The analogy is a bit broken in a way that may add confusion. The hand comes back to it's s
by frumiousirc 6mo ago
> it's like a hand - it comes back to itself after 720° of rotation
The analogy is a bit broken in a way that may add confusion. The hand comes back to it's starting configuration after two 360° rotations, each along a different axis. A spinor's symmetry has 720° of rotation along a single axis.
- aap_ 6mo agoNo, around a single axis. if you hold your hand palm up you can rotate in the (vertical) z axis around 360° and get a twist in the arm. another 360° undoes the twist, that's 720° around a single axis.
- frumiousirc 6mo agoNo. The first rotation is along an axis in the direction in which your fingers point. The second rotation is along an axis normal to your palm.
- aap_ 6mo agoIf you're rotating around your fingers you're doing something else, not what i mean. I'm just talking palm up, rotating in the vertical axis, 720°. like the cup dance.