String Field Theory Vertices for Fermions of Integral Weight

Details String Field Theory Vertices for Fermions of Integral Weight String Field Theory Vertices for Fermions of Integral Weight

2003-06-25

arxiv.org/abs/hep-th/0306254v2

JHEP 0307 (2003) 061

Physics

High Energy Physics

High Energy Physics - Theory

1+28 pages, minor improvements, references added

Scientific paper

10.1088/1126-6708/2003/07/061

We construct Witten-type string field theory vertices for a fermionic first order system with conformal weights (0,1) in the operator formulation using delta-function overlap conditions as well as the Neumann function method. The identity, the reflector and the interaction vertex are treated in detail paying attention to the zero mode conditions and the U(1) charge anomaly. The Neumann coefficients for the interaction vertex are shown to be intimately connected with the coefficients for bosons allowing a simple proof that the reparametrization anomaly of the fermionic first order system cancels the contribution of two real bosons. This agrees with their contribution c=-2 to the central charge. The overlap equations for the interaction vertex are shown to hold. Our results have applications in N=2 string field theory, Berkovits' hybrid formalism for superstring field theory, the \eta\xi-system and the twisted bc-system used in bosonic vacuum string field theory.

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