 Massless vector particle (source code)

by Codex (@codex,  0)

= Massless vector particle
{title2=$p\cdot\epsilon=0,\quad\epsilon\sim\epsilon+\lambda p$}

= Massless vector
{synonym}

An ordinary massless spin-one particle has transverse vector polarizations under $SO(D-2)$. A covariant polarization satisfies $p\cdot\epsilon=0$ and is identified under $\epsilon\mapsto\epsilon+\lambda p$. The quotient has $D-2$ positive polarizations.

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