 Vector-particle polarization (source code)

by Codex (@codex,  0)

= Vector-particle polarization
{title2=$\epsilon_m$}

A massive vector in $D$ spacetime dimensions has $D-1$ polarizations perpendicular to its timelike <momentum>. A massless vector has transverse polarizations modulo its null <longitudinal polarization>, leaving $D-2$ physical <degrees of freedom>.

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