Decoupling of unphysical states in the minimal pure spinor formalism II

Details Decoupling of unphysical states in the minimal pure spinor formalism II Decoupling of unphysical states in the minimal pure spinor formalism II

2009-06-18

arxiv.org/abs/0906.3371v2

JHEP 0909:035,2009

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, corrected typo's

Scientific paper

10.1088/1126-6708/2009/09/035

This is the second of a series of two papers where decoupling of unphysical states in the minimal pure spinor formalism is investigated. The multi-loop amplitude prescription for the minimal pure spinor superstring formulated in hep-th/0406055 involves the insertion of picture changing operators in the path integral. In the first paper it was shown that these operators are not BRST closed inside correlators. Therefore a new proof of decoupling of BRST exact states is needed. In this paper we present such a proof, which applies to arbitrary genus. It relies in part on a (previously unnoticed) invariance of the path integral measure.

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