GSO projection

introduction

• The GSO projection not only eliminates the tachyon in the bosonic NS sector but also yields the same number of bosonic and fermionic states at each mass level.
• The GSO projection of the RNS model yields a ten-dimensional string theory, called superstring theory, which is supersymmetric in spacetime and does not contain tachyons.
• Gliozzi, Scherk and Olive obtained for the first time a string theory without tachyons.
• The RNS formalism has spacetime supersymmetry after projecting out half of the states using the GSO projection. However, it is not manifestly supersymmetric. Green and Schwarz, using the light-cone gauge, have given a formulation with manifest spacetime supersymmetry

RNS model and its spectrum

• Ramond–Neveu–Schwarz model

related items

• Ramond–Neveu–Schwarz model

memo

• http://www-fp.usc.es/~edels/Strings/Lect7Str.pdf
• http://en.wikipedia.org/wiki/GSO_projection