Wellenpaket

$\Psi \left({\underline {x}},t\right)={{\left(2\pi \right)}^{-{}^{d}\!\!\diagup \!\!{}_{2}\;}}\int {\varphi \left({\underline {k}}\right){{e}^{-\omega \left({\underline {k}}\right)t+{\underline {k}}.{\underline {x}}}}{{d}^{d}}{\underline {k}}}$ d Raumdimension

$\omega \left({\underline {k}}\right)={\sqrt {{\underline {k}}^{2}+{m}^{2}}}$