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Introduction to Quantum Field Theory

Introduction to Quantum Field TheoryJohn CardyMichaelmas Term 2010 Version 13/9/10 AbstractThese notes are intended to supplement the lecture course Introduction to Quan-tum Field Theory and are not intended for wider distribution. Any errors or obviousomissions should be communicated to me A Brief History of Quantum Field Theory22 The Feynman path integral in particle Quantum mechanics Imaginary time path integrals and statistical mechanics ..73 Path integrals in Field Field Theory action functionals.

2 The Feynman path integral in particle quantum mechanics In this lecture we will recall the Feynman path integral for a system with a single degree of freedom, in preparation for the fleld theory case of many degrees of freedom. Consider a non-relativistic particle of unit mass moving in one dimension.

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