Domain

Electromagnetism

Acoustics

Alignment

Transverse

Longitudinal

Transverse

Longitudinal

Permittivities

Permeabilities

Currents

Continuity equations

Fields

,

,

,

,

Adjoint fields

Quanta of fields

Transverse photon

Longitudinal photon

Transverse phonon

Longitudinal phonon

Motion equations

(in d’Alembert form)

Gauges

Free wave equations

Shadow wave equations

Energy flows

Energy densities

Quantized charges