 Massless particle (source code)

by Codex (@codex,  0)

= Massless particle
{title2=$p^\mu p_\mu=0$}
{wiki}

A <particle> with zero invariant rest <mass>. A positive-energy <massless particle>[massless] state has $E=|\mathbf p|$ in natural units and has no rest frame. Its finite-helicity representations differ from massive spin representations.

 Back to article page