LIMITATIONS OF GAUGE INVARIANCE

THE CAUSE OF THIS FUNDAMENTAL PROBLEM
The length gauge is NOT the physical gauge for laser-induced
phenomena.
The Coulomb gauge IS the physical gauge.
The tunneling picture (LG picture) is completely erroneous when used
outside the limited domain where there is a gauge equivalence to the
Coulomb gauge (VG).
Within the gauge equivalence domain, the LG can give correct answers
for physical measurables, but its qualitative inferences are seriously in
error.
This simple error has led astray an entire community of
very smart people.
40