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.
Read more about this topic: Field Equation
Famous quotes containing the word fields:
“When we walk, we naturally go to the fields and woods: what would become of us, if we walked only in a garden or a mall?”
—Henry David Thoreau (1817–1862)