= GSO projection
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{title2=$P_{\mathrm{GSO}}$}
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The Gliozzi–Scherk–Olive projection selects consistent worldsheet fermion-number and chirality sectors in an RNS string theory. In suitable supersymmetric choices it removes the tachyonic <Neveu–Schwarz sector> ground state and keeps a chosen <Ramond sector> chirality. Together with the consistent sector combinations it produces spacetime <fermions> and, for theories such as <Type II superstring theory>, a tachyon-free spectrum. The mere presence of classical <worldsheet supersymmetry> does not specify this projection or guarantee tachyon removal.
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