Dirac action
= Dirac action
{c}
The free Dirac action is
$$
S_D=\int d^4x\,\bar\psi(i\gamma^\mu\partial_\mu-m)\psi.
$$
Its Euler-Lagrange equations are the Dirac equation and its adjoint.
= Dirac action
{c}
The free Dirac action is
$$
S_D=\int d^4x\,\bar\psi(i\gamma^\mu\partial_\mu-m)\psi.
$$
Its Euler-Lagrange equations are the Dirac equation and its adjoint.