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Di Vecchia, P.; Hornfeck, K.; Frau, M.; Lerda, A.
Nordisk Inst. for Teoretisk Atomfysik, Copenhagen (Denmark)1988
Nordisk Inst. for Teoretisk Atomfysik, Copenhagen (Denmark)1988
AbstractAbstract
[en] In this talk we present a constructive and very explicit way of calculating multiloop amplitudes in string theories. The main ingredients are the BRST invariant N String Vertex and the BRST invariant twisted propagator. This approach naturally leads to the Schottky parametrization of moduli space in terms of multipliers and fixed points of the g projective transformations which characterize a Riemann surface of genus g. The complete expression (including measure) of the multiloop corrections to the N String Vertex for the bosonic string is exhibited. (orig.)
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1988; 31 p; International meeting on geometrical and algebraic aspects of nonlinear field theory; Amalfi (Italy); May 1988
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Report
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Conference
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ACTION INTEGRAL, ANNIHILATION OPERATORS, COMMUTATION RELATIONS, CONFORMAL GROUPS, CONFORMAL INVARIANCE, CORRECTIONS, CREATION OPERATORS, HILBERT SPACE, LAGRANGIAN FIELD THEORY, MANY-BODY PROBLEM, PERTURBATION THEORY, PROPAGATOR, RIEMANN SPACE, SCATTERING AMPLITUDES, STRING MODELS, TOPOLOGY, TWISTOR THEORY, VERTEX FUNCTIONS
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