In physics, minimal coupling refers to a coupling between fields which involves only the charge distribution and not higher multipole moments of the charge distribution. This minimal coupling is in contrast to, for example, Pauli coupling, which includes the magnetic moment of an electron directly in the Lagrangian.
- Taken almost verbatim from Doughty's Lagrangian Interaction, pg. 4561
See the Hamiltonian mechanics article for a full derivation and examples.
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