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Climbing the MountainThe Scientific Biography of Julian Schwinger$
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Jagdish Mehra and Kimball Milton

Print publication date: 2003

Print ISBN-13: 9780198527459

Published to Oxford Scholarship Online: February 2010

DOI: 10.1093/acprof:oso/9780198527459.001.0001

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Green’s functions and the dynamical action principle

Green’s functions and the dynamical action principle

(p.298) 9 Green’s functions and the dynamical action principle
Climbing the Mountain



Oxford University Press

In a remarkable lecture Julian Schwinger delivered at the University of Nottingham on July 14, 1993, on the occasion of his receiving an honorary degree, entitled ‘The Greening of quantum field theory: George and I’, he summarised the central role Green's function played throughout his career. Schwinger then went on to recount his experience at the Massachusetts Institute of Technology's Radiation Laboratory during World War II and traced the influences of George Green on his own works. This chapter chronicles Schwinger's research in relation to Green's function, his first trip to Europe, and his work on the gauge invariance and vacuum polarization, the quantum action principle, electrodynamic displacements of energy levels, quantum field theory, and condensed matter physics.

Keywords:   Green's function, quantum field theory, Europe, gauge invariance, vacuum polarization, quantum action principle, condensed matter physics, electrodynamic displacements

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