Coupling (physics)

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In field theory (physics), two fields are coupled if they are interacting with each other.


Of special interest[why?] is the coupling of two (or more) vibratory systems (e.g. pendula or resonant circuits) by means of springs or magnetic fields, etc. Characteristic for a coupled oscillation is the effect of beat.


Main article: Self-energy



The concept of coupling is particularly important in physical cosmology, in which various forms of matter gradually decouple and recouple between each other.

High-energy physics[edit]

Coupling is also important in physics for the generation of plasmas. In electrical discharges, the coupling of an exciting field and a medium creates plasmas. The quality of the coupling of an exciting field of given frequency to a charged particle depends on resonance.

Gauge coupling[edit]

Main article: Coupling constant

See also[edit]