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"The worldline formalism with background gravity"

Relatore: Dott. Fiorenzo Bastianelli- Dip. di Fisica, Un. di Bologna

Aua Einstein
04 Novembre 2003 ore 15.30

The worldline formalism is a method which allows to compute efficiently Feynman diagrams by using one dimensional path integrals to describe the propagation of various particles. In this talk I will describe how to extend this formalism to include the coupling of particles of spin 0 and 1/2 to external gravity. This method requires a precise definition of path integrals for one dimensional nonlinear sigma models and their supersymmetric extensions.