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: x′μ=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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