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LIMITATIONS OF GAUGE INVARIANCE

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QUALITATIVE IMPLICATIONS <strong>OF</strong> THE LENGTH <strong>GAUGE</strong><br />

The interaction Hamiltonian in the LG is simply r ∙ E (t) .<br />

This leads to simple implications.<br />

The fact that this H I connects continuously to the static-electric-field<br />

case has been regarded not merely as an advantage, but has been<br />

treated as a requirement.<br />

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