S-matrix generating functional and effective action
- 15 March 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 37 (6) , 1485-1491
- https://doi.org/10.1103/physrevd.37.1485
Abstract
It is shown how the effective action or proper-vertex generating functional, evaluated at its stationary configuration obeying an appropriate asymptotic boundary condition, gives the generating functional of S-matrix elements to all orders. Based on this connection, we discuss the structure of the loop expansion for S-matrix elements in some detail. The inverse problem of obtaining the classical equations from the S-matrix elements is also considered. Implications concerning string theories are emphasized.Keywords
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