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Quantum Field Theory (QFT) is the theoretical framework describing the quantisation of classical fields which allows a Lorentz-invariant formulation of quantum mechanics. QFT is used both in high energy physics as well as condensed matter physics and closely related to statistical field theory. Use this tag for many-body quantum-mechanical problems and the theory of [tag:particle-physics]. Don’t combine with [tag:quantum-mechanics].

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I've got another homework problem that I have trouble with: 4.3 Exercise 3 Use the Feynman rules to show that the expansion in number of loops is an expansion in powers of $\hbar$. Hint: obvi …
asked Dec 12 '16 by Drubbels