On gauge covariant formulation of string field theories II
Tang Jufei, Zhu Chuanjie · Chinese Physics Letters · 1987
The rules of truncation for getting a gauge invariant action from a gauge-fixed action are put forward and completed. It is shown that the presently well-known gauge invariant action (ψ|Q B |ψ) can also be obtained by means of truncation. The confusion of considering this action as a gauge-fixd action is clarified.