Skript / lecture notes - Universität Paderborn
Skript / lecture notes - Universität Paderborn
Skript / lecture notes - Universität Paderborn
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Prof. Dr. Wolf Gero Schmidt<br />
<strong>Universität</strong> <strong>Paderborn</strong>, Lehrstuhl für Theoretische Physik<br />
3.5! In particular the fact that g = 2 is now automatically obtained. The Pauli equation<br />
is non-relativistic, but it does predict spin. As such, it can be thought of as occupying<br />
the middle ground between the (i) familiar Schrödinger equation (on a complex scalar<br />
wavefunction), which is non-relativistic and does not predict spin and the (ii) Dirac<br />
equation (on a complex four-component spinor), which is fully relativistic (with respect<br />
to special relativity) and predicts spin. Note that because of the properties of the Pauli<br />
matrices, if the magnetic vector potential ⃗ A is equal to zero, then the equation reduces<br />
to the familiar Schrödinger equation for a particle in a purely electric potential φ, except<br />
that it operates on a two component spinor. Therefore, we can see that the spin of the<br />
particle only affects its motion in the presence of a magnetic field.<br />
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