Chiral BRST Cohomology of N=2 Strings at Arbitrary Ghost and Picture Number

Details Chiral BRST Cohomology of N=2 Strings at Arbitrary Ghost and Picture Number Chiral BRST Cohomology of N=2 Strings at Arbitrary Ghost and Picture Number

1997-12-18

arxiv.org/abs/hep-th/9712182v1

Commun.Math.Phys. 203 (1999) 53-69

Physics

High Energy Physics

High Energy Physics - Theory

19 pages, LaTeX (uses amssymb, amsmath, amscd)

Scientific paper

10.1007/s002200050605

We compute the BRST cohomology of the holomorphic part of the N=2 string at arbitrary ghost and picture number. We confirm the expectation that the relative cohomology at non-zero momentum consists of a single massless state in each picture. The absolute cohomology is obtained by an independent method based on homological algebra. For vanishing momentum, the relative and absolute cohomologies both display a picture dependence -- a phenomenon discovered recently also in the relative Ramond sector of N=1 strings by Berkovits and Zwiebach.

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