My teacher told me that in columb gauge we have div A = 0 along with d/dt(Ao) = 0 where A is the vector potential and Ao is its time component , and time & space are not on equal footing , so these are two degrees of freedom and in lorenz gauge we have 4 dimensional divA = 0 where space & time are on equal footing so there are 3 degrees of freedom .(adsbygoogle = window.adsbygoogle || []).push({});

These are the constraints on the potential , so how come they are degree of freedom and what are the 3 degrees of freedom in lorenz gauge .

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# Radiation gauge

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