Dirac adjoint
= Dirac adjoint
{c}
{title2=$\bar\psi=\psi^\dagger\gamma^0$}
The Dirac adjoint of a spinor is $\bar\psi=\psi^\dagger\gamma^0$. It transforms contragrediently, making $\bar\psi\psi$ a Lorentz scalar and $\bar\psi\gamma^\mu\psi$ a Lorentz vector.