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An expectation value of products of fields or observables, encoding propagation, response, and scattering information.
wp-physics-correlation_functionnlab-physics-correlation_functiontong-qftEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Correlation functions encode QFT observables and dynamics.
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
wp-physics-correlation_functionnlab-physics-correlation_functionwp-physics-quantum_field_theorynlab-physics-quantum_field_theoryEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Fluctuation–dissipation relations express causal linear-response functions through appropriate equilibrium correlation or spectral functions under stationarity and thermal-equilibrium assumptions.
The source supplies a substantive formal ingredient, dynamical sector, law, field content, or mechanism of the target theoretical framework.
wp-physics-correlation_functionwp-physics-fluctuation-dissipationkubo-fluctuation-dissipationThis is an authored directed relation from the source endpoint to the target endpoint.
A propagator is a two-point correlation or Green function with a specified prescription.
The target is a member or subtype of the broader source class.
wp-physics-propagatornlab-physics-propagatorwp-physics-correlation_functionnlab-physics-correlation_function