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LIMITATIONS OF GAUGE INVARIANCE

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ANOTHER DEFECT <strong>OF</strong> THE LG/TUNNELING VIEWPOINT<br />

The limit 0 is regarded as the “tunneling limit”, which is identified<br />

as the static limit, which is unquestionably tunneling – if that were the<br />

correct limit.<br />

However, the next figure shows that, viewed as a plane wave (i.e. a laser<br />

field), 0 is actually an extreme relativistic limit.<br />

38

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