Explicit gauge covariant Euler-Lagrange equation

Details Explicit gauge covariant Euler-Lagrange equation Explicit gauge covariant Euler-Lagrange equation

2009-07-14

arxiv.org/abs/0907.2301v2

Am.J.Phys.77:839-843,2009

Physics

Classical Physics

12 pages, 0 figures. This article has been accepted by the American Journal of Physics Replacement corrects two typos referenc

Scientific paper

10.1119/1.3153503

The application of a gauge covariant derivative to the Euler-Lagrange equation yields a shortcut to the equations of motion for a field subject to an external force. The gauge covariant derivative includes an external force as an intrinsic part of the derivative and hence simplifies Lagrangians containing tensor and gauge covariant fields. The gauge covariant derivative used in the covariant Euler-Lagrange equation is presented as an extension of the coordinate covariant derivative used in tensor analysis. Several examples provide useful demonstrations of the covariant derivative relevant to studies in general relativity and gauge theory.

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