John McGreevy develops quantum field theory through connections with many-particle physics. His authored lectures construct coherent-state path integrals for both bosons and fermions, relating the choice of integration variables to their different quantum statistics. The same treatment derives low-energy phase dynamics for a superfluid. This gives a concrete route from microscopic quantum degrees of freedom to a collective field description, explaining why similar field-theory methods recur in particle and condensed-matter physics.[ref]
Physics 215C: Quantum Field Theory, Part 3 by John McGreevy. Sections 2.3 and 3.1–3.2, superfluid phase dynamics and bosonic/fermionic coherent-state path integrals
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