Residual mass-shell action in light-cone string gauge
= Residual mass-shell action in light-cone string gauge
{title2=$L_0=\alpha'p^2+N-a$}
Fixing nonzero longitudinal oscillators leaves the center-of-mass symplectic term, transverse oscillator terms, and a zero-mode multiplier imposing the <mass-shell condition>. On a patch with $p^+\ne0$, further choosing $x^+$ as time solves that <constraint> for $p^-=[p_\perp^2+(N-a)/\alpha']/(2p^+)$. This distinguishes partial oscillator gauge fixing from the subsequent time choice.