Wellenpaket

$\mathrm{\Psi }(\underset{\_}{x},t)={\left(2\pi \right)}^{-{}^d╱{}_2}\int \phi \left(\underset{\_}{k}\right)e^{-\omega \left(\underset{\_}{k}\right)t+\underset{\_}{k}.\underset{\_}{x}}{d}^d\underset{\_}{k}$ d Raumdimension

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