Field Equation - Relativistic Fields

Relativistic Fields

When it was realised that Lorentz invariance is an essential feature of nature, it became desirable to model everything as a relativistic field. This could be conveniently done under the formalism of relativistic (or covariant) classical field theory.

This works by finding a Lorentz scalar, the Lagrangian density, from which the field equations and symmetries can be readily derived.