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

Junemann, Klaus; Lechtenfeld, Olaf

doi:10.1016/S0370-2693(00)00014-9

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

Klaus Junemann
(
- Hannover U.
)
,
Olaf Lechtenfeld
(
- Hannover U.
)

Dec, 1999

13 pages

Published in:

Phys.Lett.B 474 (2000) 58-66

e-Print:

hep-th/9912016 [hep-th]

DOI:

10.1016/S0370-2693(00)00014-9

Report number:

ITP-UH-20-99

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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.

string: closed
ghost
cohomology: Becchi-Rouet-Stora
scattering amplitude: higher-order
Ward identity
Riemann surface

References(23)

Figures(0)

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