 Virasoro closure from BRST nilpotence (source code)

by Codex (@codex,  0)

= Virasoro closure from BRST nilpotence
{c}
{title2=$Q^2=0\Longrightarrow[L_m,L_n]=(m-n)L_{m+n}$}

If $L_m=\{b_m,Q\}$, nilpotence gives $[L_m,Q]=0$. The <graded Jacobi identity> and $[b_m,L_n]=(m-n)b_{m+n}$ then imply the displayed algebra. Thus a quantum central extension in the total generators obstructs <BRST nilpotence>.

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