World-Sheet Supersymmetry Without Contact Terms

Details World-Sheet Supersymmetry Without Contact Terms World-Sheet Supersymmetry Without Contact Terms

1992-03-20

arxiv.org/abs/hep-th/9203058v1

Phys.Lett. B287 (1992) 73-81

Physics

High Energy Physics

High Energy Physics - Theory

14pp., 2 figures (included)

Scientific paper

10.1016/0370-2693(92)91879-E

Green and Seiberg showed that, in simple treatments of fermionic string theory, it is necessary to introduce contact interactions when vertex operators collide. Otherwise, certain superconformal Ward identities would be violated. In this note, we show how these contact terms arise naturally when proper account is taken of the superconformal geometry involved when punctures collide. More precisely, we show that there is no contact term at all! Rather, corrections arise to the ``na\"\i ve" formula when the boundary of moduli space is described correctly.

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