Massive vector particle
= Massive vector particle
{title2=$D-1\text{ polarizations}$}
= Massive vector
{synonym}
A massive spin-one particle transforms as a vector under its <massive particle little group> $SO(D-1)$. Its $D-1$ polarizations are orthogonal to its timelike <four-momentum>. Under transverse $SO(D-2)$ rotations they split into a vector and a scalar.