Sunday, 22 November 2020

electromagnetism - How do we prove that the 4-current jmu transforms like xmu under Lorentz transformation?



Given that the position vector r to be a vector under rotation, we mean that it transforms under rotation as r=Rr. Now, taking two time-derivatives of it, one can easily see that the acceleration a=¨r transforms as a=Ra i.e., also behaves as a vector under rotation.


Now a four-vector is something which transforms under Lorentz transformation as xμ does. Given the transformation of xμ: xμ=Λμνxν

how can one show that the four-current density jμ also transforms like (1) preferably from the definition jμ=(cρ,j)?




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