= John McGreevy
{c}
{tag=Physicist}
<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.<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]{ref}
Author of <Physics 215C: Quantum Field Theory, Part 3 by John McGreevy>. Course record: https://mcgreevy.physics.ucsd.edu/s22/lecture-notes.html
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