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Starting from the earlier notions of stationary action principles, these tutorial notes shows how Schwinger’s Quantum Action Principle descended from Dirac’s formulation, which independently led Feynman to his path-integral formulation of quantum mechanics. Part I brings out in more detail the connection between the two formulations, and applications are discussed. Then, the Keldysh-Schwinger time-cycle method of extracting matrix elements is described. Part II will discuss the variational formulation of quantum electrodynamics and the development of source theory.

Physics. --- Quantum Physics. --- History and Philosophical Foundations of Physics. --- Mathematical Applications in the Physical Sciences. --- Mathematical Methods in Physics. --- Quantum theory. --- Mathematical physics. --- Physique --- Théorie quantique --- Physique mathématique --- Physics --- Physical Sciences & Mathematics --- Atomic Physics --- Quantum field theory. --- Relativistic quantum field theory --- Quantum physics. --- Field theory (Physics) --- Quantum theory --- Relativity (Physics) --- Physical mathematics --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Mechanics --- Thermodynamics --- Mathematics --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics

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This is a graduate level textbook on the theory of electromagnetic radiation and its application to waveguides, transmission lines, accelerator physics and synchrotron radiation. It has grown out of lectures and manuscripts by Julian Schwinger prepared during the war at MIT's Radiation Laboratory, updated with material developed by Schwinger at UCLA in the 1970s and 1980s, and by Milton at the University of Oklahoma since 1994. The book includes a great number of straightforward and challenging exercises and problems. It is addressed to students in physics, electrical engineering, and applied mathematics seeking a thorough introduction to electromagnetism with emphasis on radiation theory and its applications. A hardcover edition containing additionally the reprints of more than 15 papers by Schwinger on these topics is available separately.

Electromagnetic waves. --- Electromagnetic energy --- Electromagnetic radiation --- Electromagnetic theory --- Waves --- Mathematical physics. --- Particle acceleration. --- Computer engineering. --- Classical Electrodynamics. --- Mathematical Methods in Physics. --- Particle Acceleration and Detection, Beam Physics. --- Electrical Engineering. --- Computers --- Particles (Nuclear physics) --- Acceleration (Mechanics) --- Nuclear physics --- Physical mathematics --- Physics --- Design and construction --- Acceleration --- Mathematics --- 537.8 --- 537.8 Electromagnetism. Electromagnetic field. Electrodynamics. Maxwell theory --- Electromagnetism. Electromagnetic field. Electrodynamics. Maxwell theory --- Optics. --- Electrodynamics. --- Physics. --- Electrical engineering. --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Electric engineering --- Engineering --- Light

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This is a graduate level textbook on the theory of electromagnetic radiation and its application to waveguides, transmission lines, accelerator physics and synchrotron radiation. It has grown out of lectures and manuscripts by Julian Schwinger prepared during the war at MIT's Radiation Laboratory, updated with material developed by Schwinger at UCLA in the 1970s and 1980s, and by Milton at the University of Oklahoma since 1994. The book includes a great number of straightforward and challenging exercises and problems. It is addressed to students in physics, electrical engineering, and applied mathematics seeking a thorough introduction to electromagnetism with emphasis on radiation theory and its applications. A hardcover edition containing additionally the reprints of more than 15 papers by Schwinger on these topics is available separately.

Mathematical physics --- Electromagnetism. Ferromagnetism --- Experimental nuclear and elementary particle physics --- Nuclear physics --- Electronics --- Computer. Automation --- deeltjesfysica --- lasers (technologie) --- informatica --- kernenergie --- wiskunde --- elektronica --- fysica --- elektromagnetisme

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Casimir effect. --- 530.19 --- 530.19 Fundamental functions in general. Potential. Gradient. Intensity. Capacity etc. --- Fundamental functions in general. Potential. Gradient. Intensity. Capacity etc. --- Casimir effect --- Casimir force --- Casimir forces --- Effect, Casimir --- Force, Casimir --- Electric fields --- Vacuum polarization --- Zero-point field --- Fundamental functions in general. Potential. Gradient. Intensity. Capacity etc

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Electrodynamics --- Electrodynamics. --- Electromagnetism. Ferromagnetism --- Electrodynamique --- Électrodynamique.