The authors derive two coupled diagrammatic equations that organize perturbative calculations of two-point correlation functions in homogeneous and inhomogeneous superfluids, recovering the acoustic-metric limit in the hydrodynamic regime.
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A diagrammatic approach to correlation functions in superfluids
The authors derive two coupled diagrammatic equations that organize perturbative calculations of two-point correlation functions in homogeneous and inhomogeneous superfluids, recovering the acoustic-metric limit in the hydrodynamic regime.