Level-two scalar Virasoro null state
= Level-two scalar Virasoro null state
{title2=$|Z\rangle=(L_{-2}+\tfrac32L_{-1}^2)|p\rangle$}
For $L_0|p\rangle=-|p\rangle$, the descendant $Z=(L_{-2}+\tfrac32L_{-1}^2)|p\rangle$ obeys $L_1Z=0$ and $L_2Z=(D-26)|p\rangle/2$. It becomes physical and null at 26 and supplies the scalar quotient needed for the massive spin-two <light-cone gauge in string theory> spectrum.