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-   -   EM Differential Form version of Lagragian (http://www.physicsforums.com/showthread.php?t=477039)

haloempty Feb28-11 01:27 PM

EM Differential Form version of Lagragian
 
Given that we have the one form A we can get the F=dA, and I see how dF=0 and d*F=J, give maxwell's equations. But if we write the Action as LaTeX Code: \\int 1/2dALaTeX Code: \\wedge *dA+ALaTeX Code: \\wedge J how do we go about doing a variational procedure to get d*dA=J? I tried taking d(Lagrangian)=0 but that seemed to be off by a factor of 2. I guess I'm not sure how you vary an action when your lagrangian is composed of forms. Any ideas?


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