<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi></mml:math>Matrix for Yang-Mills and Gravitational Fields

Abstract

A method is suggested (and applied to the Yang-Mills and gravitational fields) for the construction of the generating functional ($S$ matrix) for fields possessing an invariance group. The unitarity and gauge independence of the $S$ matrix on the mass shell are seen explicitly.