Intrinsic normal ordered vertex operators from the multiloop N-tachyon amplitude

G. ALDAZABAL; M. BONINI; R. IENGO; C. NÚÑEZ

PHYSICS LETTERS B

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 1987 vol. 199

0370-2693

We construct vertex operators for arbitrary mass level states of the closed bosonic string. Starting from a generalization of the Koba-Nielsen amplitude suitable for an arbitrary genus Riemann surface. We read the vertex operators from the residues of the poles for the intermediate states Since the original expression is metric independent and normal ordered without the need of inventing a regularzation scheme, our vertex operators also possess these properties. We discuss their general features.