Its easy to see that with time-like geodesics (when L=g_{u, v}x'^{u} y'^{v} = 1 along the geodesics) the geodesic equation drops out of the Euler-Lagrange equations but if L=g_{u, v}x'^{u} y'^{v} = 0 along the null-geodesics how can we use the Euler-Lagrange equations?

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Anonymous Mon May 18 23:38:02 2015 No.7271117 [Reply] [Original]

Its easy to see that with time-like geodesics (when L=g_{u, v}x'^{u} y'^{v} = 1 along the geodesics) the geodesic equation drops out of the Euler-Lagrange equations but if L=g_{u, v}x'^{u} y'^{v} = 0 along the null-geodesics how can we use the Euler-Lagrange equations?

>>	Anonymous Tue May 19 12:50:45 2015 No.7272237 bump

>>	Anonymous Tue May 19 12:54:06 2015 No.7272244 Geodesics aside, I was planning to build and sell such a rig for 2+ years, but because I'm a lazy fuck I now get to witness others to get make money off it.

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/sci/ - Science & Math