Ebene Welle

$\psi (\underset{\_}{r},t)=e^{\mathfrak{i}(\underset{\_}{k}.\underset{\_}{x}-\omega t)}$

$\psi \left(x^{\mu }\right)={\psi }_0\exp \left(\frac{p_{\mu }{x}^{\mu }}{\mathfrak{i}\hslash }\right)$