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

Failed to parse (syntax error): {\displaystyle \omega \left( \underline{k} \right)=\sqrt{{{{\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{k}}}^{2}}+{{m}^{2}}}}