Ward identities and the vanishing theorem for loop amplitudes of the closed N=2 string

Abstract

The existence of a ground ring of ghost number zero operators in the chiral BRST cohomology of the N=2 string is used to derive an infinite set of Ward identities for the closed-string scattering amplitudes at arbitrary genus. These identities are sufficient to rederive the well known vanishing theorem for loop amplitudes with more than three external legs.

12 pages, 2 figures

References in corpus (2)

• Non-local symmetries of the closed N=2 string
• Chiral BRST Cohomology of N=2 Strings at Arbitrary Ghost and Picture Number

Cited by in corpus (4)

• On the Integrability of Covariant Field Theory for Open N=2 Strings
• N=2 Quantum String Scattering
• Global conformal anomaly in N=2 string
• Hidden Symmetries of the Open N=2 String