We know that the A field is more fundamental (at least Feynman thought so): http://en.wikipedia.org/wiki/Aharonov%E2%80%93Bohm_effect http://en.wikipedia.org/w

We know that the A field is more fundamental (at least Feynman thought so): http://en.wikipedia.org/wiki/Aharonov%E2%80%93Bohm_effect http://en.wikipedia.org/wiki/Aharonov%E2%80%93Bohm_effect