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A formal expansion in coupling constants or loops around a free or solvable theory, with domain controlled when couplings and kinematics permit.
wp-physics-quantum_perturbation_theorynlab-physics-perturbative_qfttong-qftEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Perturbative QFT is a loop or coupling expansion around a solvable theory. It is often asymptotic rather than convergent and is quantitatively useful only in appropriate coupling and kinematic regimes.
The target is a model, idealization, restricted ansatz, approximation scheme, phenomenological fit, or historical representation used for the source system or theory. It need not have a universal small error parameter and is not thereby a controlled limit or effective theory. The edge label and detail must identify the precise status.
wp-physics-quantum_perturbation_theorynlab-physics-perturbative_qftwp-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.
Feynman diagrams index perturbative terms.
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
wp-physics-feynman_diagramnlab-physics-feynman_diagramwp-physics-quantum_perturbation_theorynlab-physics-perturbative_qftThis is an authored directed relation from the source endpoint to the target endpoint.
Perturbation theory computes scattering amplitudes order by order.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
wp-physics-scattering_amplitudenlab-physics-scattering_amplitudewp-physics-quantum_perturbation_theorynlab-physics-perturbative_qft