Non-local symmetries of the closed N=2 string

Abstract

By carefully analysing the picture-dependence of the BRST cohomology an infinite set of symmetry charges of the closed N=2 string is identified. The transformation laws of the physical vertex operators are shown to coincide with the linearised non-local symmetries of the Plebanski equation (which is the effective field theory of the closed N=2 string). Moreover, the corresponding Ward identities are powerful enough to allow for a rederivation of the well known vanishing theorem for the tree-level correlation functions with more than three external legs.

arXiv comment28 pages, no figures

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• Exact Solutions of Berkovits' String Field Theory
• Self-Dual Supergravity and Twistor Theory
• On the Integrability of Covariant Field Theory for Open N=2 Strings
• Closed N=2 Strings: Picture-Changing, Hidden Symmetries and SDG Hierarchy
• Ward identities and the vanishing theorem for loop amplitudes of the closed N=2 string
• Hidden Symmetries of the Open N=2 String