Undergrad Sign of the spatial part of the J.J interaction

gernos
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Is the ##A_\mu J^\mu## interaction energy between two separated identical current densities positive (repulsive) or negative (attractive) ?
I think it is negative because of the ##g_{\mu \nu}## metric tensor, but I am not sure.
 
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Thread 'Reference frames, center of rotation, etc'

Topic about reference frames, center of rotation, postion of origin etc Comoving ref. frame is frame that is attached to moving object, does that mean, in that frame translation and rotation of object is zero, because origin and axes(x,y,z) are fixed to object? Is it same if you place origin of frame at object center of mass or at object tail? What type of comoving frame exist? What is lab frame? If we talk about center of rotation do we always need to specified from what frame we observe?
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