Difference between revisions of "Free wave equation"

The free wave equation on ${\displaystyle R^{1+d}}$ is given by
${\displaystyle \Box f=0}$
where f is a scalar or vector field on Minkowski space ${\displaystyle R^{1+d}}$. In coordinates, this becomes
${\displaystyle -\partial _{tt}f+\Delta f=0.}$