High Energy Quantum Electrodynamics I
Quantum electrodynamics is up to the present day the only example of a quantised field theory the predictions of which agree with experiment to a high degree of precision. In the following lecture we shall adopt the somewhat optimistic standpoint, that this agreement is not accidential and that it is therefore worthwile to spend time on explaining the formal structure of the theory also in regions, where the connection with the experiment is not a close one. We shall along with it stress the field aspect: we shall study expectation values of products of field operators (Green’s functions), which are the quantum analog to classical field functions, and shall study these Green’s functions as response functions to small, external perturbations: the analogy to the classical concept of a field strength and test charge is evident.
KeywordsPerturbation Theory Gauge Transformation Functional Differentiation Renormalization Constant Landau Gauge
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