 Retarded and advanced null coordinates (source code)

by Codex (@codex,  0)

= Retarded and advanced null coordinates
{title2=$u=t-z,\ v=t+z$}

In the $(t,z)$ plane, $u=t-z$ is retarded time and $v=t+z$ is advanced time. The radial part of the <Minkowski metric> is $-dt^2+dz^2=-du\,dv$.

 Back to article page