Abstract
Gauge invariant actions are discussed for free open superstrings in the BRST formalism. While the Neveu-Schwarz sector is analogous to the bosonic string, the Ramond sector has a complication in the commuting zero modes of the superconformal ghost. It is shown how consistency determines the inner product of the zero-mode states. On this basis, a fully gauge-invariant action for free open superstrings is derived. It is also shown that by consistent truncation this action precisely reproduces the “minimal” one with a smaller gauge invariance discussed by other authors.
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